Gland Packing for Industrial Pumps and Valves
International Seal supplies industrial gland packing and compression packing for pumps, valves, agitators and rotating equipment across a wide range of industrial applications.
Our range includes PTFE, graphite, aramid, carbon fibre and specialist braided packing materials, designed for applications involving water, steam, oils, chemicals, abrasive media and elevated operating temperatures. As a UK supplier of engineered sealing products, we support distributors, OEMs and industrial customers with standard and specialist gland packing requirements. Through our established international supply network, we can source packing materials in a range of constructions, cross-sectional sizes and performance grades.
Whether you require a replacement for an existing packing specification or assistance identifying an alternative material, our team can review your application and provide a competitive quotation.
Gland Packing Range
International Seal supplies a range of compression packing materials for industrial pumps, valves and process equipment.
Different packing constructions offer varying levels of chemical resistance, thermal performance, lubrication and abrasion resistance. The appropriate material depends on the equipment, operating conditions and media being sealed.
PTFE gland packing offers excellent chemical resistance and low-friction characteristics, making it suitable for a broad range of industrial pump and valve applications.
Carbon fibre gland packing combines good thermal conductivity with mechanical strength and chemical resistance. Commonly used in industrial pumps, valves and process equipment.
Graphite gland packing provides excellent thermal conductivity, high-temperature resistance and low-friction performance for demanding industrial sealing applications.
Graphited PTFE packing combines the chemical resistance of PTFE with the lubricating and heat-dissipating characteristics of graphite. Commonly used in industrial pumps and rotating equipment
Aramid fibre gland packing offers high tensile strength and excellent resistance to abrasion and mechanical wear for demanding sealing applications.
Synthetic fibre packing includes constructions manufactured from materials such as acrylic and other engineered fibres, often incorporating lubricants or specialist impregnation treatments.
What Is Gland Packing?
Gland packing, also known as compression packing or stuffing box packing, is a sealing material used to control fluid or gas leakage around rotating shafts and reciprocating or stationary valve stems. The packing is typically manufactured from braided fibres, formed into a square or rectangular cross-section and installed within a stuffing box surrounding the shaft or stem. When the gland follower is tightened, axial compression causes the packing to expand radially against the shaft and stuffing box walls, creating a controlled sealing interface.
Unlike many mechanical seals, traditional gland packing is adjustable and can accommodate certain variations in shaft condition, movement and operating environment. However, the correct packing construction, installation method and gland adjustment are essential for reliable performance.
Gland packing is widely used in pumps, valves, mixers, agitators and other industrial equipment where leakage control, maintainability and resistance to the operating media are important.
Gland Packing Material Selection
Choosing the correct compression packing material is essential for achieving reliable sealing performance and controlling wear, friction and leakage.
Different packing fibres and impregnation treatments offer different levels of resistance to chemicals, abrasion, pressure and operating temperatures.
| Material | How It Seals | Relative Temperature Capability | Abrasion Resistance | Typically Specified For |
|---|---|---|---|---|
| PTFE Gland Packing | Braided PTFE fibres compress around the shaft or valve stem, providing a chemically resistant, low-friction sealing interface. | Moderate to high | Lower to moderate | Chemical pumps, industrial valves, water treatment and aggressive media |
| Graphite Gland Packing | Compressible graphite conforms to the sealing surfaces while conducting heat away from the contact area. | High | Lower to moderate | Steam valves, power generation, high-temperature process equipment |
| Aramid Gland Packing | High-strength braided fibres form a durable sealing interface capable of resisting mechanical wear from abrasive media. | Moderate to high | Higher | Slurry pumps, wastewater treatment, abrasive industrial processing |
| Carbon Fibre Gland Packing | Braided carbon fibres provide a stable sealing structure with good heat transfer and resistance to mechanical loading. | High | Moderate to higher | Industrial pumps, process valves, elevated-temperature sealing |
| Graphited PTFE Gland Packing | Graphite-filled PTFE fibres combine chemical resistance with low friction and improved heat dissipation. | Moderate to high | Moderate | Rotating equipment, chemical pumps, general process applications |
| Synthetic Fibre Gland Packing | Braided synthetic fibres compress around the shaft, with suitable impregnation supporting lubrication and leakage control. | Grade dependent | Moderate | Water pumps, industrial machinery, general-purpose sealing |
The characteristics above are indicative. Actual performance depends on the fibre construction, impregnation, lubrication, operating speed, pressure and temperature.
The correct packing should always be selected against the complete operating conditions.
How Does Gland Packing Work?
Gland packing creates a seal by applying controlled compression to packing rings installed within the equipment stuffing box. The packing surrounds a rotating shaft or valve stem, creating resistance to fluid movement through the sealing chamber. As the gland follower is tightened, the packing compresses and expands against the shaft and surrounding housing. The resulting contact pressure restricts leakage while allowing the equipment to operate.
Compression and Sealing Pressure
Correct gland compression is essential.
Insufficient compression can result in excessive leakage, while over-tightening can increase friction, operating temperature, shaft wear and premature packing failure. The required compression depends on the packing construction, equipment design and application.
Friction and Lubrication
In rotating equipment, packing generates friction as the shaft moves against the sealing material.
Suitable lubrication and heat removal are therefore important for maintaining performance. Certain packing materials incorporate PTFE, graphite or other lubricating treatments to reduce friction and support reliable operation.
Leakage Control
Packed pumps frequently require controlled leakage to provide cooling and lubrication at the shaft interface. The correct leakage rate depends on the equipment and packing design.
Valve stem packing, by comparison, may be designed to achieve very low leakage under appropriate operating conditions. Packing adjustment should always follow the equipment manufacturer’s recommendations.
Pump Gland Packing
Pump gland packing is used to control leakage around rotating pump shafts in equipment handling liquids, slurries and industrial process media. The packing material must withstand the fluid being pumped while maintaining acceptable friction, wear and leakage characteristics.
Typical applications include:
- Centrifugal pumps
- Water and wastewater pumps
- Chemical process pumps
- Slurry and abrasive media pumps
- Industrial transfer pumps
- General process equipment
PTFE, graphited PTFE, aramid and carbon-based materials are frequently selected for pump applications, depending on the operating conditions. Where abrasive fluids are present, packing construction and shaft protection become particularly important.
For higher shaft speeds or demanding duty cycles, the relationship between pressure, shaft speed, heat generation and lubrication must be assessed.
Valve Gland Packing
Valve gland packing is installed around a valve stem to control leakage between the pressurised process system and the surrounding environment. Unlike rotating pump packing, valve packing commonly operates with limited or intermittent stem movement. Depending on the application, it may need to accommodate high temperatures, steam, aggressive chemicals, pressure cycling or stringent fugitive-emission requirements.
Typical applications include:
- Gate valves
- Globe valves
- Control valves
- Steam valves
- Chemical processing valves
- Industrial isolation valves
Graphite, PTFE and specialist composite constructions are commonly used for valve packing. Where low-emission performance or a particular industry specification is required, the complete packing arrangement and supporting certification should be reviewed.
Standard and Specialist Compression Packing
Industrial gland packing is available in a variety of fibre constructions, braid patterns and impregnation treatments.These characteristics influence the material's resistance to friction, chemical attack, abrasion, pressure and operating temperature.International Seal can review requirements for standard and specialist compression packing constructions, including:
- Braided PTFE packing
- Flexible graphite packing
- Aramid fibre packing
- Carbon fibre packing
- Graphite-impregnated PTFE
- Synthetic fibre packing
- Hybrid and reinforced packing constructions
- Specialist high-temperature packing
Packing can also incorporate lubricating and dispersion treatments designed to improve sealing performance in particular operating environments. Availability depends on the required material, braid construction, packing dimensions and quantity.
Gland Packing Sizes & Specifications
Compression packing is commonly supplied in square-section braided lengths, which are subsequently cut into individual packing rings.The correct cross-sectional size is determined by the dimensions of the shaft and stuffing box. Packing that is too small may not develop sufficient sealing pressure, while oversized packing can be difficult to install correctly and may cause excessive compression.
When specifying gland packing, the following details should be considered:
- Packing material and construction
- Square-section size
- Shaft or valve stem diameter
- Stuffing box internal diameter
- Packing chamber depth
- Operating temperature
- System pressure
- Shaft speed, where applicable
- Process fluid or chemical media
- Required quantity or packing length
Existing packing references, equipment information and samples can also be reviewed where the original specification is unavailable.
Gland Packing Applications
Gland packing is used throughout industrial processing, manufacturing and fluid-handling equipment where reliable leakage control is required.
Chemical Processing
PTFE, graphite and specialist packing constructions for pumps and valves handling aggressive chemicals, solvents and process media.
Water & Wastewater
Compression packing for water pumps, treatment equipment and industrial systems operating with clean water, wastewater and suspended solids.
Oil & Gas
Graphite, carbon and specialist packing materials for valves, pumps and process equipment operating with hydrocarbons and demanding service conditions.
Power Generation
High-temperature graphite and specialist valve packing for steam systems, power generation equipment and industrial utilities.
Marine & Offshore
Compression packing for pumps, valves and auxiliary systems exposed to water, process fluids and challenging operating environments.
Pulp & Paper
Aramid, PTFE and synthetic packing materials for pumps and processing equipment involving fibrous or abrasive media.
Food & Beverage
Suitable packing grades for processing equipment where fluid compatibility, cleanliness and applicable material compliance requirements are important.
Why Choose International Seal?
International Seal supplies engineered sealing products to distributors, OEMs and industrial customers throughout the UK and Europe. Our established international sourcing network enables us to support both standard and specialist sealing requirements across a broad range of industries.
Extensive Material Range
PTFE, graphite, aramid, carbon and specialist compression packing constructions for industrial applications.
Specialist Material Sourcing
Support for non-standard packing specifications, specialist materials and application-specific sealing requirements.
Competitive Supply
Established supplier relationships providing competitive quotations for industrial gland packing and other engineered sealing products.
Technical Support
Assistance with identifying suitable packing materials based on equipment design, operating conditions and process media.
Alternative Supply Options
Existing product references, samples and packing specifications can be reviewed where an alternative supplier or replacement material is required.
Gland Packing FAQs
What is gland packing?
Gland packing is a compression sealing material installed within a stuffing box to control leakage around rotating shafts, reciprocating components or valve stems. It is commonly manufactured from braided fibres such as PTFE, graphite, aramid and carbon.
What is the difference between gland packing and compression packing?
The terms are commonly used interchangeably. Gland packing refers to the material used within a gland or stuffing box, while compression packing describes the method by which the material is compressed to create a seal.
What materials are used for gland packing?
Common materials include PTFE, graphite, aramid fibre, carbon fibre and synthetic fibres. Hybrid constructions combining different fibres, lubricants and impregnation treatments are also available.
Which gland packing is best for pumps?
The correct material depends on the process fluid, operating pressure, shaft speed, temperature and whether abrasive particles are present. PTFE, graphited PTFE and aramid-based packing are commonly used for pump applications.
Which gland packing is suitable for steam valves?
Graphite-based packing is frequently selected for high-temperature steam valve applications. The exact grade should be chosen according to operating pressure, temperature and equipment requirements.
What is the difference between PTFE and graphite gland packing?
PTFE is valued for chemical resistance and low-friction characteristics, while graphite provides excellent thermal conductivity and elevated-temperature capability. The appropriate material depends on the application and operating conditions.
How is gland packing sized?
Gland packing is generally specified by its square cross-sectional dimension, which is calculated from the difference between the stuffing box bore and the shaft diameter. The packing chamber dimensions and required number of rings must also be considered.
Can gland packing be used in high-pressure applications?
Yes, certain specialist compression packing constructions are suitable for high-pressure service. Pressure capability depends on the material, equipment design, shaft speed, temperature and installation arrangement.
Does pump gland packing need to leak?
Many packed rotating pumps require a small amount of controlled leakage for lubrication and cooling. The acceptable leakage rate depends on the equipment and packing design, and should follow the manufacturer's instructions.
Can you supply gland packing to an existing specification?
International Seal can review existing material descriptions, dimensions, manufacturer references and samples to identify an appropriate packing construction or alternative supply option, subject to availability.
Need a Gland Packing Quote?
International Seal supplies industrial gland packing and compression packing for pumps, valves and specialist sealing applications. Our sourcing network supports PTFE, graphite, aramid, carbon and other braided packing constructions across a variety of operating environments.
Whether you require standard pump packing, high-temperature valve packing or a replacement for an existing specification, we can review your requirements. Send us the packing material, cross-sectional size, operating conditions and required quantity. Existing product references, equipment details and samples can also be reviewed.