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Polymer Seals, Valves, and Seats

Poly Fluoro Ltd Ltd. employs a range of filled and unfilled grades to offer a diverse range of seals for a variety of OEM applications.

Polymers employed include PTFE, PEEK, POM (Delrin), PVDF, PA66, PVC, UHMWPE, and PPS, to name just a few.

Our typical range of parts includes, but is not limited to

  • Back-up rings

  • Thrust washers

  • Ball-valve seats

  • Butterfly valve seats

  • Piston ring seals

  • Rotary shaft seals

  • Spring-energised seals

  • Lip seals

  • Tapered valves

  • V-packings

  • Chevron seals

Parts are CNC machined to tolerances of up to 10 microns – which is in line with best-in-class global tolerance norms.

Our parts go through a rigorous inspection process, including raw material inspection, in-process inspection, and final inspection. All parts are assigned batch numbers with full traceability to the raw material and process parameters.

For high volume parts, special inspection gauges and fixtures are employed to ensure 100% inspection before dispatch.

Material selection is essential in getting the correct solution for a given application. Poly Fluoro Ltd understands the strengths and limitations of each material and accordingly works with the end-users to narrow in on the most effective option.

Material Name Main Properties Notes/Applications Temperature Range

Virgin PTFE

Very low coefficient of friction and excellent chemical resistance. Soft and easily machinable. Will deform under high loads

FDA approved

-40°C to 260°C

15% Glass filled PTFE

Decreased compressive strength and lower deformation under load than virgin PTFE. Reduced creep

Abrasive material

-40°C to 260°C

25% Glass filled PTFE

Similar to 15% Glass better wear resistance, higher compressive strength, and lower deformation under load.

Abrasive material

-40°C to 260°C

Stainless Steel filled PTFE

Extremely hard wearing. Excellent strength and stability under extreme loads and elevated temperatures.

Can be used on steam and thermal fluid applications Highly abrasive

-40°C to 260°C

TFM

Much denser polymer structure than Virgin PTFE. Displays better stress recovery.

Modified TFE Polymer Can be welded for fabrication Excellent for bellows and diaphragms

-40°C to 260°C

Carbon Graphite filled PTFE

Lower thermal expansion-contraction rate than conventional PTFE Harder than normal PTFE

Ideal for use on steam and thermal fluid applications Excellent for V-packings and Chevron Rings

-40°C to 260°C and even 320°C on Thermal Fluid applications

UHMWPE

Highly resistant to corrosive chemicals, with the exception of oxidising acids and organic solvents Extremely high wear resistance

Also known as High Modulus Polyethylene (HMPE) or High Performance Polyethylene (HPPE)

-40°C to +80°C

PCTFE

Excellent for cryogenic and Oxygen use.

A homo-polymer of Chlorotrifluoroethylene

-270°C to 260°C

Virgin PEEK

Excellent chemical resistance and mechanical properties at elevated temperatures High tensile strength and dimensional stability

FDA approved Most effective as a seal, backup ring, V-packing or Chevron seal Used as rotary seals in Nuclear applications

-40°C to 260°C

Carbon filled PEEK

Many similar properties to Virgin PEEK. Particularly suitable for elevated temperatures and high load situations.

Low coefficient of friction and suitable for many extremely corrosive applications

-40°C to 260°C

Glass filled PEEK

Many similar properties to Virgin PEEK. Particularly suitable for elevated temperatures and high load situations.

Low coefficient of friction and suitable for high wear applications

-40°C to 300°C

PTFE filled PEEK

Many similar properties to Virgin PEEK. Particularly suitable for elevated temperatures and high load situations.

Higher lubricity than Virgin PEEK. Suited to sealing applications where start-stop or rotary motions are involved at higher RPMs

-40°C to 260°C

Acetal or Delrin

Displays good resistance to wear and deformation under load Easy to machine; dimensionally very stable

Excellent for valve seat applications Excellent for ferrules, probes and sensors

up to 80°C

PPS or Ryton

Excellent chemical resistance and mechanical properties at elevated temperatures High tensile strength and dimensional stability

Used extensively in pulp and paper manufacturing as it resists chemicals specific to this industry Cost effective alternative to PEEK

-40°C to 220°C

PVDF or Kynar

Excellent chemical resistance High tensile strength and dimensional stability Resistant to creep

Used in chemical industries for linings, fittings, and sleeves Excellent in semi-conductor components

-40°C to 220°C

PA or Nylon

Displays good resistance to wear and offers thermal and electrical insulation in moderate conditions

Easy to machine; dimensionally very stable. Inexpensive

Excellent as bobbins, sliding elements, and insulating sheaths

PA6, PA66, and PA12 variants - can be filled with glass or PTFE for enhanced properties

up to 80°C

PEI or Ultem

High chemcial resistance

Excellent dielectric strength

Can be both compression and injection moulded

Finds application in waste water management, chemical processing, heavy electricals, and medical equipments

up to 180°C

PI or Kapton

Among the strongest polymers with superior resistance to both impact and temperature

As a film, it exhibits excellent dielectric stregth

Used as an insulation material in film form

Can be compression moulded to make high-strength seals and valves

-250°C to 400°C

Why Poly Fluoro Ltd ?

Extreme toughness
Valves exhibit mechanical strength to meet or exceed global norms
Excellent wear resistance
Special fillers and additives to improve wear properties
High precision
Tolerance on dimensions to within 20 microns
For more information on PTFE Tubing, visit our blog.
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