SMS Seals
SMS hygienic unions are widely used across dairy processing, food & beverage production and other sanitary process equipment. The SMS seal sits between the mating components of the union and creates the sealing interface when the connection is assembled and tightened. The system typically uses an L-style joint ring, designed to provide a secure seal within the hygienic connection.
International Seal supplies SMS seals for hygienic process pipework used throughout the dairy, pharmaceutical, food & beverage industries. Suitable for SMS 1145 hygienic unions, our sealing range is available in standard sizes from 1″ to 4″, with a wide choice of elastomer and specialist materials to suit different process media, temperatures and hygiene requirements.
SMS Specifications
SMS gaskets are available for hygienic threaded union connections used throughout sanitary process equipment.
- Standard sizes from 1" to 4"
- NBR, EPDM, FKM & Silicone
- L-style seal profiles available
- Metal & X-Ray Detectable Options
- Suitable for SMS 1145 hygienic unions
- Food-Contact & Medical Grades Available
- Core Sizes Held in UK Stock — Same-Day Dispatch
Materials
SMS seals are available in a range of elastomer and specialist materials, allowing the gasket to be selected according to the process media, operating temperature, cleaning regime and regulatory requirements.
| Material | Typical Applications |
|---|---|
| NBR | Oils, fats and general-purpose applications |
| EPDM | Water, hot water, steam and hygienic processing |
| FKM | Oils, chemicals and elevated temperatures |
| Silicone | Temperature extremes and hygienic applications |
The correct material should always be selected against the complete operating conditions. For further guidance, see our Chemical Compatibility Guide and Elastomer Temperature Range Guide.
Typical Applications
SMS joint rings are widely used throughout hygienic process systems where threaded unions provide secure connections that can still be dismantled for cleaning, inspection and maintenance.
- Food & Beverage Process Lines
- Dairy Processing Equipment
- Breweries & Beverage Systems
- Pumps, Valves & Tanks
- CIP Cleaning Systems
- Pharmaceutical & Hygienic Processing
Material selection should consider the process product, cleaning chemicals, operating temperature and any food-contact or regulatory requirements.
Metal Detectable SMS Seals
Metal and X-ray detectable SMS gaskets are available for food, beverage, dairy and other hygienic processing environments where foreign-body contamination control forms part of the production system.
Detectable compounds incorporate specialist additives designed to improve the ability of metal detection or X-ray inspection equipment to identify fragments of sealing material if a gasket becomes damaged during production. Detectable options are available across selected elastomer grades suitable for hygienic sealing applications.
Detection performance depends on the compound, fragment size, product being inspected and the sensitivity and configuration of the inspection equipment. Detectable SMS seals should therefore be validated under the customer’s actual production conditions.
SMS Seal FAQs
What is an SMS seal?
The joint ring used in an SMS hygienic union, a metric connection system common across dairy, food and beverage processing.
Are SMS and DIN 11851 seals the same?
No. Both are metric threaded union systems, but the seal profiles and dimensions differ.
Which materials are available?
NBR, EPDM, FKM and silicone, with detectable options across selected grades.
Need an SMS Seal?
Send us the size, material, profile and quantity you need, or simply send a photo if you’re unsure which SMS seal you have. We can help identify the correct seal and provide pricing, availability and lead time.
We aim to respond to all enquiries within one business day.