Sealing Compound Reference: Elastomer, PTFE and Metal Seal Grades
International Seal supplies over 250 sealing compounds, each with its own IS compound code. The range covers NBR, HNBR, EPDM, FKM, FFKM, silicone, fluorosilicone, AFLAS®, polyurethane and specialist elastomers, plus PTFE, engineering plastics, metal seal alloys and technical ceramics.
Quote an IS code on your enquiry, drawing or purchase order, and we supply the same formulation, hardness and colour on every repeat order, with matching documentation. If you only have another supplier’s code, or just a colour and hardness, send it and we’ll identify the equivalent grade.
How to Use This Reference
Specifying a new part — Pick the material family from the operating conditions first, then the grade. Our chemical compatibility guide and elastomer temperature range guide cover the family-level decision.
Replacing an existing part — If you have an International Seal compound code, quote it. If you have a competitor’s code or only a colour and hardness, send what you have and we will identify an equivalent.
Compliance requirements — FDA, EU 1935/2004, 3-A, USP Class VI, WRAS, NSF 61, NORSOK and detectable grades are tagged on each grade and gathered in the approvals index at the end of the page. State the requirement at enquiry stage so the correct grade is quoted from the outset.
Documentation — Material data sheets and test reports are available on request for the grades listed. Compliance applies to a specific grade, not to a material family as a whole.
Jump to a Compound
NBR Compounds
NBR (nitrile rubber) is the most widely used sealing elastomer. It is the default choice for mineral oils, hydraulic fluids, fuels, greases and water, offering good compression set, tear and abrasion resistance at the lowest cost of the oil-resistant rubbers.
Our NBR range runs from 50 to 90 Shore A. It includes FDA and 3-A grades for food plants, a WRAS grade for UK drinking water, an anti-static grade, an EN 549 gas grade and aerospace grades to AMS specifications.
- Best for: hydraulics, pneumatics, fuel and oil systems, general industrial O-rings.
- Avoid: ozone and outdoor weathering, brake fluid, ketones, esters and strong acids.
- Typical range: -30°C to +100°C · Grades listed: 13, from 50 to 90 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| N111 | NBR 50 | 50 | Black | White, Blue, Yellow, Green, Red | -30 to +100 typ. | — | Low closing force, soft seals and gaskets | On request |
| N109 | NBR 60 | 60 | Black | White, Blue, Yellow, Green, Red | -30 to +100 typ. | — | Low closing force | On request |
| N100 | NBR 70 | 70 | Black | White, Blue, Yellow, Green, Red | -30 to +100 typ. | — | General oil, fuel and hydraulic sealing | On request |
| N107 | NBR 70 FDA | 70 | Black | — | -30 to +100 typ. | FDA | Food-contact oils and fats | On request |
| N108 | NBR 70 3-A | 70 | Black | — | -30 to +100 typ. | 3-A | Hygienic dairy and food plant | On request |
| N130 | NBR 70 Anti-static | 70 | Black | On request | -30 to +100 typ. | — | ATEX areas, fuel handling | On request |
| N160 | NBR 70 Gas | 70 | Black | On request | Per sheet | EN 549 / EN 682 | Gas appliances and distribution | On request |
| N140 | NBR 75 Potable Water | 75 | Black | On request | Per sheet | WRAS · FDA | UK water meters and valves | On request |
| N150 | NBR 75 AMS-P-83461 | 75 | Black | On request | Per spec | AMS-P-83461 | Aerospace hydraulic fluid | On request |
| N110 | NBR 80 | 80 | Black | On request | -30 to +100 typ. | — | Higher pressure | On request |
| N120 | XNBR 80 (carboxylated) | 80 | Black | On request | -20 to +100 typ. | — | Abrasion, dynamic hydraulic seals | On request |
| N101 | NBR 90 | 90 | Black | On request | -30 to +100 typ. | — | Higher pressure, extrusion resistance | On request |
| N151 | NBR AMS-P-25732 | Per spec | Black | On request | Per spec | AMS-P-25732 | Aerospace hydraulic, MIL-PRF-5606 | On request |
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Reports are available upon request
HNBR Compounds
HNBR (hydrogenated nitrile) keeps nitrile’s resistance to oils and fuels, but adds far better heat, ozone and abrasion performance, with continuous service to around +140°C. It is the standard step up from NBR when temperature or wear is the limit.
Our HNBR range covers 60 to 90 Shore A. It includes an FDA grade, a refrigerant-compatible grade for air conditioning, and NORSOK M-710 / ISO 23936-2 rapid gas decompression grades for oil and gas service.
- Best for: automotive engines and transmissions, air conditioning, high-pressure hydraulics, oil and gas.
- Avoid: ketones, esters, and aromatic and chlorinated solvents.
- Typical range: -30°C to +140°C · Grades listed: 7, from 60 to 90 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| H102 | HNBR 60 | 60 | Black | On request | -30 to +140 typ. | — | Low closing force, hot oils | On request |
| H100 | HNBR 70 FDA | 70 | Black | On request | -30 to +140 typ. | FDA | Hot oils, automotive, food | On request |
| H105 | HNBR 70 A/C | 70 | Green | On request | -30 to +140 typ. | — | Automotive and HVAC refrigerant seals | On request |
| H103 | HNBR 80 | 80 | Black | On request | -30 to +140 typ. | — | Higher pressure hot oil and automotive | On request |
| H101 | HNBR 90 | 90 | Black | On request | -30 to +140 typ. | — | High pressure, extrusion resistance | On request |
| H110 | HNBR 90 RGD | 90 | Black | On request | Per sheet | NORSOK M-710 · ISO 23936-2 | Oil & gas, rapid gas decompression | On request |
| H111 | HNBR 90 RGD Low Temp | 90 | Black | On request | Per sheet | NORSOK M-710 · ISO 23936-2 | Cold-climate oil & gas | On request |
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Reports are available upon request
EPDM Compounds
EPDM is the first choice for hot water, steam, CIP and SIP cleaning chemicals, glycols, glycol-based brake fluid and outdoor weathering. Peroxide-cured grades give the best heat resistance and compression set, and are the standard for food, dairy, beverage and pharmaceutical process seals.
Our EPDM range runs from 50 to 90 Shore A. It includes FDA and EU 1935/2004 grades, USP Class VI, and a steam-resistant 90. There are also drinking water grades approved to WRAS, KTW/W270, ACS and NSF 61, and an aerospace grade for phosphate-ester hydraulic fluid.
- Best for: hygienic process seals, steam, hot water, drinking water and outdoor seals.
- Avoid: mineral oils, fuels, vegetable oils and animal fats.
- Typical range: -45°C to +150°C · Grades listed: 11, from 50 to 90 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| E106 | EPDM 50 | 50 | Black | On request | -45 to +150 typ. | — | Soft gaskets and seals, low closing force | On request |
| E105 | EPDM 60 FDA | 60 | Black | On request | -45 to +150 typ. | FDA | Low closing force hygienic gaskets | On request |
| E100 | EPDM 70 Peroxide Cure | 70 | Black | On request | -45 to +150 typ. | — | Hot water, steam, CIP/SIP | On request |
| E101 | EPDM 70 Peroxide Cure FDA | 70 | Blue | — | -50 to +135 | FDA · EU 1935 | Hygienic hot water, steam, CIP/SIP | On request |
| E200 | EPDM 70 USP Class VI | 70 | Blue | — | -45 to +150 typ. | USP VI | Pharma WFI and clean steam | On request |
| E120 | EPDM 70 Peroxide Cure, Potable Water | 70 | Black | On request | Per sheet | WRAS · KTW-BWGL · W270 · ACS · NSF 61 · FDA | UK and EU drinking water | On request |
| E140 | EPDM 70 Brake Fluid | 70 | Black | On request | -45 to +150 typ. | ASTM D2000 | Automotive glycol brake systems | On request |
| E104 | EPDM 80 Peroxide Cure | 80 | Black | On request | -45 to +150 typ. | FDA · NSF 61 | Higher pressure water and steam | On request |
| E121 | EPDM 80 Potable Water | 80 | Black | On request | Per sheet | WRAS | UK drinking water, higher pressure | On request |
| E110 | EPDM 90 Steam Resistant | 90 | Blue | On request | -45 to +150 typ. | — | Steam service | On request |
| E130 | EPDM Phosphate-Ester Fluid | Per spec | Black | On request | Per spec | NAS 1613 | Aircraft phosphate-ester hydraulics | On request |
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Reports are available upon request
FKM (Fluoroelastomer) Compounds
FKM (fluoroelastomer) combines high temperature resistance, typically to +200°C, with excellent resistance to oils, fuels, aromatic and chlorinated solvents and many acids. It is the usual upgrade when NBR runs out of temperature or chemical resistance.
Standard FKM stiffens below about -20°C. Our low-temperature grades stay flexible to TR10 -42°C, and ETP grades extend resistance to steam and amines. The range runs from 60 to 95 Shore A. It includes FDA, 3-A, NSF 61 and USP Class VI grades, NORSOK rapid gas decompression grades, and aerospace grades to AMS specifications.
- Best for: chemical processing, fuel systems, high-temperature hydraulics, semiconductor and vacuum equipment.
- Avoid: ketones and low-molecular-weight esters. Standard grades also aren't suited to hot water, steam or hot amines.
- Typical range: -20°C to +200°C (low-temperature grades to TR10 -42°C) · Grades listed: 27, from 60 to 95 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| V104 | FKM 60 | 60 | Black | Brown, Blue, Green, Red | -20 to +200 typ. | — | Low closing force, high temp | On request |
| V122 | FKM 70 FDA | 70 | Black | On request | -20 to +200 typ. | FDA | Food-contact oils and fats, high temp | On request |
| V123 | FKM 70 FDA | 70 | White | On request | -20 to +200 typ. | FDA | Food plants that don’t accept black seals | On request |
| V100 | FKM 75 | 75 | Black | Brown, Blue, Green, Red | -20 to +200 typ. | — | High temp, fuels, oils, chemicals | On request |
| V106 | FKM 75 FDA | 75 | Green | — | -20 to +200 typ. | FDA | Food contact, high temp | On request |
| V108 | FKM 75 Low Temp, TR10 -25°C | 75 | Black | On request | Per sheet | — | Sub-zero static and dynamic | On request |
| V110 | FKM 75 Low Temp, TR10 -30°C | 75 | Black | On request | Per sheet | — | Sub-zero static and dynamic | On request |
| V112 | FKM 75 Ultra Low Temp, TR10 -42°C | 75 | Black | On request | Per sheet | — | Extreme cold | On request |
| V113 | FKM 75 Ultra Low Temp, TR10 -42°C | 75 | Blue | — | Per sheet | — | Extreme cold | On request |
| V115 | FKM 75 Viton™ Extreme™ ETP | 75 | Black | On request | Per sheet | — | Steam, amines, aggressive chemicals | On request |
| V116 | FKM 75 FDA / NSF 61 | 75 | Black | — | -20 to +200 typ. | FDA · NSF 61 | Potable water and food | On request |
| V118 | FKM 75 FDA | 75 | Blue | — | -20 to +200 | FDA · EU 1935 | Hygienic, high temp, CIP | On request |
| V119 | FKM 75 3-A | 75 | Brown | — | -20 to +200 typ. | 3-A | Hygienic dairy and food plant | On request |
| V200 | FKM 75 USP Class VI | 75 | Black | — | -20 to +200 typ. | USP VI | Pharma and medical equipment | On request |
| V130 | FKM 75 High Purity | 75 | Black | On request | Per sheet | Outgassing data on sheet | Semicon and vacuum | On request |
| V140 | FKM 75 AMS 7276 | 75 | Black | On request | Per spec | AMS 7276 | Aerospace fuel and oil | On request |
| V141 | FKM 75 AMS-R-83248 Type 1 Class 1 | 75 | Black | On request | Per spec | AMS-R-83248 | Aerospace hydraulic and fuel | On request |
| V143 | FKM 75 AMS-R-83485 Low Temp | 75 | Black | On request | Per spec | AMS-R-83485 | Aerospace low temperature | On request |
| V150 | FKM 75 High Fluorine (GF type) | 75 | Black | On request | Per sheet | — | Fuels, aromatics, steam | On request |
| V160 | FKM 75 Recycled Content | 75 | Black | On request | -20 to +200 | — | Sustainability tenders | On request |
| V124 | FKM 80 FDA | 80 | Black | On request | -20 to +200 typ. | FDA | Higher-pressure food-contact sealing | On request |
| V102 | FKM 90 | 90 | Black | Brown | -20 to +200 typ. | — | High pressure, high temp | On request |
| V109 | FKM 90 Low Temp, TR10 -25°C | 90 | Black | On request | Per sheet | — | Sub-zero, high pressure | On request |
| V114 | FKM 90 Ultra Low Temp, TR10 -42°C | 90 | Black | On request | Per sheet | — | Extreme cold, high pressure | On request |
| V121 | FKM 90 FDA | 90 | Blue | On request | -20 to +200 typ. | FDA | Hygienic, higher pressure | On request |
| V142 | FKM 90 AMS-R-83248 Type 1 Class 2 | 90 | Black | On request | Per spec | AMS-R-83248 | Aerospace high pressure | On request |
| V120 | FKM 95 RGD | 95 | Black | On request | Per sheet | NORSOK M-710 · ISO 23936-2 | Oil & gas, rapid gas decompression | On request |
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Reports are available upon request
FFKM (Perfluoroelastomer) Compounds
FFKM (perfluoroelastomer) has the broadest chemical and temperature resistance of any elastomer. It seals reliably in strong acids, bases, solvents, amines, steam and process chemicals that attack FKM and EPDM, and high-temperature grades serve to +330°C.
FFKM is specified where seal failure is expensive, because its longer service life outweighs the higher part cost. Our range covers 60 to 90 Shore A. It includes general-purpose, high-temperature, steam, amine-resistant and low-temperature (to -40°C) grades, plus FDA, USP Class VI, 3-A, semiconductor and NORSOK rapid gas decompression grades.
- Best for: chemical processing, pharmaceutical and biotech, semiconductor equipment, oil and gas.
- Avoid: fluorinated solvents, and hot amines except with the amine-resistant grades. Check other duties with us.
- Typical range: -40°C to +330°C, depending on grade · Grades listed: 18, from 60 to 90 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| FFKM230 | FFKM 60 FDA | 60 | White | On request | -10 to +240 | FDA · BPAF-free | Low closing force, food and pharma | On request |
| FFKM102 | FFKM 70 General Purpose | 70 | Black | On request | -15 to +260 | ADI-free | Chemical processing, low closing force | On request |
| FFKM100 | FFKM 75 General Purpose | 75 | Black | — | -10 to +320 | — | Aggressive chemicals to +320°C | On request |
| FFKM150 | FFKM 75 FDA | 75 | Black | — | Per sheet | FDA | Food-contact aggressive media | On request |
| FFKM200 | FFKM 75 FDA / USP Class VI | 75 | White | — | -10 to +230 | FDA · USP VI | Pharma and food, aggressive media | On request |
| FFKM110 | FFKM 75 Very High Temp | 75 | Black | On request | -10 to +330 | ADI-free | Highest-temperature duty | On request |
| FFKM111 | FFKM 75 Very High Temp | 75 | White | On request | -10 to +330 | ADI-free | Highest-temperature, light colour | On request |
| FFKM130 | FFKM 75 Amine Resistant | 75 | Black | On request | -10 to +240 | — | Hot amines and ammonia | On request |
| FFKM140 | FFKM 75 Low Temp | 75 | Black | On request | -40 to +240 | — | Low-temperature chemical duty | On request |
| FFKM210 | FFKM 75 FDA / USP VI / 3-A | 75 | White | On request | -10 to +240 | FDA · USP VI · 3-A · ADI-free | Pharma and dairy | On request |
| FFKM211 | FFKM 75 FDA | 75 | White | On request | -10 to +240 | FDA | Food and pharma, light colour | On request |
| FFKM220 | FFKM 75 FDA Steam | 75 | White | On request | -10 to +320 | FDA · BPAF-free | Food and pharma, high-temp steam | On request |
| FFKM300 | FFKM 75 Semicon | 75 | Black | On request | -10 to +230 | UL 94 | Semiconductor equipment | On request |
| FFKM103 | FFKM 80 General Purpose | 80 | Black | On request | -15 to +260 | ADI-free | Chemical processing | On request |
| FFKM151 | FFKM 80 FDA | 80 | Black | On request | -10 to +240 | FDA · BPAF-free | Food-contact aggressive media | On request |
| FFKM101 | FFKM 90 Steam / High Temp | 90 | Black | On request | -10 to +320 | ADI-free | High pressure, steam | On request |
| FFKM120 | FFKM 90 RGD | 90 | Black | On request | -10 to +240 | NORSOK (RGD) | Oil & gas, rapid gas decompression | On request |
| FFKM131 | FFKM 90 Amine Resistant | 90 | Black | On request | -10 to +240 | — | Hot amines, high pressure | On request |
| FFKM141 | FFKM 90 Low Temp | 90 | Black | On request | -40 to +240 | — | Low temp, high pressure | On request |
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Reports are available upon request
Silicone (VMQ) Compounds
Silicone (VMQ) offers the widest temperature range of the common elastomers, typically -60°C to +200°C. It is physiologically inert, odourless and tasteless, which makes it the standard choice for food, medical and laboratory equipment. Platinum-cured grades give the highest purity.
Silicone has low tear and abrasion strength, so it suits static seals and gaskets rather than dynamic duty. Our range runs from 30 to 80 Shore A. It includes FDA grades across the hardness range, USP Class VI platinum-cured silicone, medical-grade LSR and an aerospace grade to AMS specifications.
- Best for: food and beverage, medical devices, pharmaceutical equipment, wide-temperature static seals.
- Avoid: fuels, mineral oils, concentrated acids, high-pressure steam and dynamic seals.
- Typical range: -60°C to +200°C · Grades listed: 14, from 30 to 80 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| S104 | Silicone 30 FDA | 30 | White | On request | -60 to +200 typ. | FDA | Soft seals, low closing force | On request |
| S111 | Silicone 40 FDA | 40 | Red | On request | -60 to +200 typ. | FDA | Soft food seals, low closing force | On request |
| S105 | Silicone 50 FDA | 50 | Red | On request | -60 to +200 typ. | FDA | Food seals and gaskets | On request |
| S106 | Silicone 60 FDA | 60 | Translucent | On request | -60 to +200 typ. | FDA | Food seals and gaskets | On request |
| S100 | Silicone 70 | 70 | Red | Blue, White | -60 to +200 typ. | — | Wide temperature range, static seals | On request |
| S110 | Silicone 70 Medical Grade | 70 | Semi-translucent | — | -60 to +200 typ. | — | Medical and laboratory | On request |
| S200 | Silicone 70 Platinum-cured USP Class VI | 70 | Translucent | — | -60 to +200 | USP VI | Pharma, biotech, medical devices | On request |
| S103 | Silicone 70 FDA | 70 | Translucent | On request | -60 to +200 typ. | FDA | Food and beverage | On request |
| S108 | Silicone 70 FDA | 70 | White | On request | -60 to +200 typ. | FDA | Food and beverage | On request |
| S109 | Silicone 70 FDA | 70 | Red | On request | -60 to +200 typ. | FDA | Food and beverage | On request |
| S130 | PVMQ Very Low Temp | 70 | Red | On request | Per sheet | — | Aerospace and cold-chain | On request |
| S140 | Silicone 70 AMS (aerospace) | 70 | Red | On request | Per spec | AMS 3301–3304 series | Aerospace general purpose | On request |
| S107 | Silicone 80 FDA | 80 | Red | On request | -60 to +200 typ. | FDA | Higher-pressure food seals | On request |
| S120 | LSR Medical | Per grade | Translucent | On request | Per sheet | USP VI · ISO 10993 | Medical devices, moulded components | On request |
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Reports are available upon request
Fluorosilicone (FVMQ) Compounds
Fluorosilicone (FVMQ) combines silicone’s low-temperature flexibility with resistance to fuels, oils and many solvents. It is the standard material for aerospace fuel systems, and for any static seal that must handle fuel at very low temperatures, typically -60°C to +175°C.
Like silicone, it has limited tear and abrasion strength, so it is used for static seals. Our range covers 50 to 80 Shore A, with an AMS-R-25988 grade for aerospace.
- Best for: aerospace and automotive fuel systems, cold-climate equipment.
- Avoid: dynamic seals, ketones and brake fluid.
- Typical range: -60°C to +175°C · Grades listed: 5, from 50 to 80 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| FS103 | FVMQ 50 | 50 | Blue | On request | -60 to +175 typ. | — | Soft fuel-resistant seals, low closing force | On request |
| FS101 | FVMQ 60 | 60 | Blue | On request | -60 to +175 typ. | — | Low closing force, fuel | On request |
| FS100 | FVMQ 70 | 70 | Blue | On request | -60 to +175 typ. | — | Fuel and oil, low temperature | On request |
| FS110 | FVMQ 70 AMS-R-25988 | 70 | Blue | On request | Per spec | AMS-R-25988 | Aerospace fuel systems | On request |
| FS102 | FVMQ 80 | 80 | Blue | On request | -60 to +175 typ. | — | Higher pressure, fuel | On request |
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Reports are available upon request
AFLAS® (FEPM) Compounds
AFLAS® (FEPM) resists steam, hot water, amines, strong bases and sour gas, which are media that degrade standard FKM. It is widely used in oil and gas, chemical processing and steam service.
Our range includes 75 and 90 Shore A grades, low-compression-set grades for long service life, and a NORSOK M-710 rapid gas decompression grade. AFLAS® is a registered trademark of AGC Inc.
- Best for: sour gas and amine service, steam, strong bases, oil and gas.
- Avoid: aromatic hydrocarbons and chlorinated solvents. Flexibility is limited below about -15°C.
- Typical range: -15°C to +200°C · Grades listed: 5, from 75 to 90 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| A100 | AFLAS 150x 75 | 75 | Black | On request | -15 to +200 typ. | — | Steam, amines, sour gas | On request |
| A102 | AFLAS 600x 75 Low Compression Set | 75 | Black | Dark Green | -15 to +200 typ. | — | Long-life oil & gas sealing | On request |
| A101 | AFLAS 150x 90 | 90 | Black | On request | -15 to +200 typ. | — | Steam, amines, high pressure | On request |
| A103 | AFLAS 600x 90 Low Compression Set | 90 | Black | Dark Green | -15 to +200 typ. | — | Long-life, high pressure | On request |
| A106 | AFLAS 90 RGD | 90 | Black | On request | Per sheet | NORSOK M-710 · ISO 23936-2 | Oil & gas RGD, sour service | On request |
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Reports are available upon request
Polyurethane (AU / EU) Compounds
Polyurethane has the highest wear, tear and extrusion resistance of the common sealing elastomers. That makes it the standard material for hydraulic rod, piston, wiper and buffer seals. It handles mineral-oil hydraulic fluids well and resists high pressure without extruding.
Our range runs from 70 to 95 Shore A: softer grades for wipers and scrapers, harder grades for high-pressure rod and piston seals.
- Best for: hydraulic cylinders, wipers and scrapers, buffers, high-wear dynamic seals.
- Avoid: hot water and steam, strong acids and bases, and service above about +80°C.
- Typical range: -40°C to +80°C · Grades listed: 6, from 70 to 95 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| PU102 | Polyurethane 70 | 70 | Natural / blue | On request | -40 to +80 typ. | — | Soft wipers, buffers and rollers | On request |
| PU103 | Polyurethane 80 | 80 | Natural / blue | On request | -40 to +80 typ. | — | Wipers and low-pressure seals | On request |
| PU104 | Polyurethane 85 | 85 | Natural / blue | On request | -40 to +80 typ. | — | Wiper and scraper seals | On request |
| PU105 | Polyurethane 90 | 90 | Natural / blue | On request | -40 to +80 typ. | — | Rod, piston and buffer seals | On request |
| PU100 | Polyurethane 92 | 92 | Natural / blue | On request | -40 to +80 typ. | — | Rod, piston and wiper seals | On request |
| PU101 | Polyurethane 95 | 95 | Natural / blue | On request | -40 to +80 typ. | — | High-pressure hydraulics | On request |
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Reports are available upon request
Polychloroprene (CR) and Specialist Elastomers
Polychloroprene (CR), widely known as neoprene, has balanced resistance to weathering, ozone, refrigerants and moderate oils, with good flame resistance. It is common in HVAC, refrigeration, marine and general industrial gaskets. Our CR range runs from 50 to 90 Shore A, plus an aerospace grade to AMS specifications.
For specific duties we also supply ACM and AEM for automotive transmission and hot engine oils, butyl (IIR) for vacuum and low gas permeability, ECO for fuel and gas systems, and CSM for chemical and weather resistance.
- Best for: weather and refrigerant seals, automotive oil seals, vacuum and gas equipment.
- Avoid (CR): strong oxidising acids, esters, ketones and aromatic hydrocarbons.
- Grades listed: 11, from 50 to 90 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| CR101 | CR (Neoprene) 50 | 50 | Black | On request | -40 to +100 typ. | — | Soft weather seals and gaskets | On request |
| CR102 | CR (Neoprene) 60 | 60 | Black | On request | -40 to +100 typ. | — | Weather seals and gaskets | On request |
| CR100 | CR (Neoprene) 70 | 70 | Black | On request | -40 to +100 typ. | — | Weathering, refrigerants, general | On request |
| CR103 | CR (Neoprene) 80 | 80 | Black | On request | -40 to +100 typ. | — | Higher pressure, refrigerants | On request |
| CR104 | CR (Neoprene) 90 | 90 | Black | On request | -40 to +100 typ. | — | High pressure, extrusion resistance | On request |
| CR110 | CR AMS 3209 | Per spec | Black | On request | Per spec | AMS 3209 | Aerospace weather-resistant seals | On request |
| AC100 | ACM 70 | 70 | Black | On request | -15 to +150 typ. | ASTM D2000 | Automotive transmission and engine oils | On request |
| AE100 | AEM 70 | 70 | Black | On request | -30 to +150 typ. | ASTM D2000 | Automotive hot oil, turbo and crankcase | On request |
| B100 | IIR (Butyl) 70 | 70 | Black | On request | -55 to +100 typ. | — | Vacuum and gas, low permeability | On request |
| EC100 | ECO 70 | 70 | Black | On request | -40 to +125 typ. | — | Fuel systems and gas | On request |
| CS100 | CSM 70 | 70 | Black | On request | -35 to +125 typ. | — | Chemical and weather resistance | On request |
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Reports are available upon request
Thermoplastic Elastomers (TPE)
Thermoplastic elastomers are moulded without vulcanisation and are fully recyclable. They suit static seals, grips, overmoulds and appliance seals in water and non-hydrocarbon duty, with lower heat resistance than vulcanised rubber.
- Best for: appliance and consumer seals, overmoulding, recyclable components.
- Avoid: oils and fuels, and sustained temperatures above about +100°C (SEBS) or +135°C (TPV).
- We supply SEBS-based TPE and TPV grades.
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| SE100 | SEBS TPE 58 | 58 | TBC | -50 to +100 | — | Static seals, non-hydrocarbon duty | On request | |
| TV100 | TPV 70 | 70 | Black | On request | -60 to +135 typ. | — | Automotive and appliance seals | On request |
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Reports are available upon request
Metal & X-ray Detectable Compounds
Metal and X-ray detectable seals contain a dispersed additive that makes fragments visible to standard metal detectors and X-ray inspection systems. A damaged seal is caught before it reaches the product. Food, beverage and pharmaceutical plants specify them as part of foreign-body control under HACCP and retailer standards such as BRCGS.
Blue is the standard food-industry colour because it contrasts with most foods; other colours are used for zoning. Our detectable range covers NBR, FKM, EPDM and silicone from 70 to 90 Shore A, with FDA, EU 1935/2004 and 3-A grades.
- Best for: food, beverage and pharmaceutical lines with metal detection or X-ray inspection.
- Avoid: the same media as the base polymer (NBR, FKM, EPDM or silicone).
- Grades listed: 17, from 70 to 90 Shore A
| IS code | Description | Shore A | Colour | Other colours | Temp range (°C) | Approvals / specs | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| CD100 | NBR 70 Metal & X-ray Detectable | 70 | Black | Red, Blue, White, Yellow, Green, Purple | -30 to +100 typ. | Metal · X-ray · FDA | Food lines with metal / X-ray detection | On request |
| CD107 | NBR 90 Metal Detectable | 90 | Blue | On request | -30 to +100 typ. | FDA · 3-A 18-03 | High-pressure detectable seals | On request |
| CD200 | FKM 75 Metal & X-ray Detectable | 75 | Black | Red, Blue, White, Yellow, Green, Purple | -20 to +200 typ. | Metal · X-ray · FDA | Food lines with metal / X-ray detection | On request |
| CD300 | EPDM 75 Metal & X-ray Detectable | 75 | Black | Red, Blue, White, Yellow, Green, Purple | -45 to +150 typ. | Metal · X-ray · FDA | Food lines with metal / X-ray detection | On request |
| CD401 | Silicone 70 Metal & X-ray Detectable | 70 | Blue | Red, Blue, White, Yellow, Green, Purple | -60 to +200 typ. | Metal · X-ray · FDA | Food lines with metal / X-ray detection | On request |
| CD400 | Silicone 75 Metal & X-ray Detectable | 75 | Red | Red, Blue, White, Yellow, Green, Purple | -60 to +200 typ. | Metal · X-ray · FDA | Food lines with metal / X-ray detection | On request |
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Reports are available upon request
PTFE & Engineering Plastics
PTFE is chemically inert to almost all industrial media and serves from -200°C to +260°C with very low friction. That makes it the material of choice for chemical seals, gaskets, back-up rings and valve seats.
Virgin PTFE gives the highest purity. Fillers improve wear and creep resistance: glass and carbon for general duty, bronze for hydraulic wear and back-up rings, and graphite for dry running. PEEK adds strength and stiffness for high-pressure back-up rings and valve seats. FEP- and PFA-encapsulated O-rings combine fluoropolymer chemical resistance with an elastomer core. Our range includes an FDA and EU 10/2011 virgin PTFE grade.
- Best for: aggressive chemicals, back-up rings, valve seats, low-friction and dry-running parts.
- Grades listed: 15, covering PTFE, filled PTFE, PEEK, nylon, acetal, PCTFE and encapsulated O-rings
| IS code | Grade | Filler | Colour | — | Temp range (°C) | Approvals | Typical use | Data sheet |
|---|---|---|---|---|---|---|---|---|
| PT100 | Virgin PTFE | None | White | -200 to +260 | — | Chemical seals, gaskets | On request | |
| PT101 | Virgin PTFE FDA | None | White | -200 to +260 | FDA 177.1550 · EU 10/2011 | Food and pharma | On request | |
| PT110 | Glass-filled PTFE | 25% glass | Off-white | -200 to +260 | — | Wear and creep resistance | On request | |
| PT120 | Carbon-filled PTFE | 25% carbon | Black | -200 to +260 | — | Water and steam, wear | On request | |
| PT130 | Graphite-filled PTFE | 15% graphite | Grey | -200 to +260 | — | Dry running, low friction | On request | |
| PT140 | Bronze-filled PTFE | 40% bronze | Bronze | -200 to +260 | — | Hydraulic wear and back-up rings | On request | |
| PT150 | Modified PTFE | None | White | -200 to +260 | — | Low-porosity valve seats | On request | |
| PK100 | Virgin PEEK | None | Natural | -50 to +250 typ. | — | Back-up rings, valve seats | On request | |
| PK110 | Glass-filled PEEK | 30% glass | Natural | -50 to +250 typ. | — | Structural seal components | On request | |
| PK120 | Carbon-filled PEEK | 30% carbon | Black | -50 to +250 typ. | — | High-wear bearing and seal parts | On request | |
| PA110 | Glass-filled nylon | PA66 GF | Black | -40 to +120 typ. | — | Wear and guide rings | On request | |
| PO100 | POM (acetal) | None | White / black | -40 to +100 typ. | — | Back-up and wear rings | On request | |
| PC100 | PCTFE | None | Natural | -240 to +150 typ. | — | Cryogenic valve seats | On request | |
| EN100 | FEP-encapsulated O-ring, FKM core | FEP jacket | Clear jacket | -20 to +200 typ. | FDA | Aggressive chemicals, pharma | On request | |
| EN110 | PFA-encapsulated O-ring, silicone core | PFA jacket | Clear jacket | -60 to +200 typ. | FDA | Aggressive chemicals, low temp | On request |
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Reports are available upon request
Metal Seal Alloys & Platings
Metal seals are used where no elastomer survives: extreme temperatures, high vacuum, radiation or very high pressure. Choose the alloy for temperature, strength and corrosion resistance, then the plating for seating load and leak rate.
Stainless steels cover general duty. Alloy X-750 and Alloy 718 keep their spring properties and strength at high temperature. Alloy 400 and Alloy C-276 resist seawater and aggressive chemicals. Quote the alloy code with a plating suffix: for example, M110-AG is Alloy X-750 with silver plating.
- Best for: extreme temperature, high vacuum, radiation and very high pressure, where no elastomer survives.
- Avoid: low-load or flexible flanges, rough or damaged sealing faces, and joints opened often.
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Reports are available upon request
Approvals and specifications section
Approvals apply to a specific grade, not to a whole material family. The table below lists every grade that holds each approval or specification. Each code links to its material section above.
| Approval / specification | What it covers | Grades |
|---|---|---|
| FDA 21 CFR 177.2600 / 177.2400 / 177.1550 | US rules for food contact: rubber articles for repeated use (177.2600), perfluorocarbon elastomers (177.2400) and PTFE resins (177.1550). Compliance rests on permitted ingredients and extraction limits. | NBR: N107, N140 · HNBR: H100 · EPDM: E101, E104, E105, E120 · FKM: V106, V116, V118, V121–V124 · FFKM: FFKM150, FFKM151, FFKM200, FFKM210, FFKM220, FFKM230 · Silicone: S103–S109, S111 · Detectable: CD102, CD107, CD201 · PTFE: PT101, EN100, EN110 |
| EU 1935/2004 | The EU framework regulation for all food-contact materials, supported by a Declaration of Compliance | E101, V118, CD102, CD201 |
| EU 10/2011 | The EU regulation for plastic food-contact materials, with migration limits. It covers PTFE and plastics, not rubber. | PT101 |
| 3-A Sanitary Standard 18 | US hygienic standard for rubber product-contact surfaces in dairy and food equipment | N108, V119, FFKM210, CD107 |
| USP Class VI | The most demanding USP plastics class: biological reactivity tests under USP <88> (systemic injection, intracutaneous and implantation). Used for pharmaceutical, biotech and medical equipment. | E200, V200, FFKM200, FFKM210, S200, S120 |
| ISO 10993 | Biological evaluation of medical devices | S120 |
| WRAS | UK approval for products in contact with drinking water, tested to BS 6920 | N140, E120, E121 |
| KTW-BWGL / DVGW W270 | German drinking water requirements: the UBA elastomer guideline for hygiene, and W270 for microbial growth | E120 |
| ACS | French sanitary certificate for materials in contact with drinking water | E120 |
| NSF/ANSI 61 | North American standard for drinking water system components | E104, E120, V116 |
| NORSOK M-710 / ISO 23936-2 | Qualification of elastomers for oil and gas, including rapid gas decompression (RGD) resistance | H110, H111, V120, A106, FFKM120 |
| AMS / NAS aerospace | SAE Aerospace Material Specifications and NAS standards. The Approvals column on the compound page shows the specification for each grade. | N150, N151, E130, V140–V143, S140, FS110, CR110 |
| API 6A718 | API standard for Alloy 718 in oil and gas production equipment | M111 |
| EN 549 / EN 682 | European standards for rubber seals in gas appliances (EN 549) and gas supply systems (EN 682) | N160 |
| UL 94 | Flammability rating for plastics and elastomers | FFKM300 |
| Metal & X-ray detectable | A dispersed additive that lets metal detectors and X-ray systems find seal fragments | CD100–CD106, CD107, CD200–CD204, CD300, CD301, CD400, CD401 |
| ASTM D2000 / SAE J200 | The classification system for rubber materials. Automotive grades carry their full line call-out on the data sheet. | H100, H101, H105, AC100, AE100, E140 |
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Frequently Asked Questions
What is an International Seal compound code?
Every grade we supply has a unique IS compound code, such as E101 or FFKM200. Quote it on your enquiry, drawing or purchase order, and you receive the same formulation, hardness and colour on every repeat order, with matching documentation. The code also makes it simple to specify the same seal across sites.
Which compound do I need for food contact: FDA, EU 1935/2004 or 3-A?
It depends on where the product is sold and what your customer audits against. FDA 21 CFR 177.2600 is the US requirement and the most widely requested worldwide. EU 1935/2004 is the legal framework for food-contact materials in the EU and UK, supported by a Declaration of Compliance. 3-A Sanitary Standard 18 is common in dairy equipment. E101, V118, CD102 and CD201 hold both FDA and EU 1935/2004.
What is the difference between FKM, FFKM and AFLAS®?
FKM is a fluoroelastomer with excellent resistance to oils, fuels and many chemicals to about +200°C, and it is the standard high-performance choice. FFKM is fully fluorinated, so it resists almost all chemicals and reaches +330°C on high-temperature grades, at a much higher price. AFLAS® (FEPM) resists steam, amines, strong bases and sour gas that attack FKM, but it is weaker in aromatic hydrocarbons.
Which hardness should I choose?
70 Shore A suits most O-rings and seals. Choose 50–60 Shore A for low closing force, soft flanges or uneven surfaces. Choose 80–90 Shore A for high pressure or a larger extrusion gap. Other hardnesses are available on request in most families.
Do you supply seals approved for drinking water?
Yes. E120 is a peroxide-cured EPDM 70 approved to WRAS (UK), KTW-BWGL and DVGW W270 (Germany), ACS (France) and NSF/ANSI 61 (North America), so one grade covers most European and US drinking water projects. E121 (EPDM 80) and N140 (NBR 75) also hold WRAS approval.
Can you supply seals to AMS aerospace specifications?
Yes. We list FKM grades to AMS 7276 and AMS-R-83248, fluorosilicone to AMS-R-25988, and other AMS and NAS grades in NBR, EPDM, silicone and CR. Certificates of conformance are supplied on request. Send the specification, class and size, and we'll confirm the grade.
Why are metal-detectable seals blue?
Blue is rare in natural foods, so a blue fragment stands out on the line and during visual checks. That is why blue is the usual colour for food-contact seals and plastics. Metal-detectable seals add a second safeguard, because metal detectors and X-ray systems can also find the fragment. Other colours are used for zoning, such as separating raw and cooked areas.
Need Help Selecting a Compound?
Send us the process media, temperature range, pressure, hardness and any approval you need, and we'll recommend a grade from this reference. Replacing an existing seal? A sample, photo, drawing or another supplier's part number is usually enough to identify it.