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Garlock PTFE Gaskets

Garlock’s GYLON® and GYLON EPIX® PTFE gaskets deliver industry-leading chemical resistance, low emissions, and long-term sealing reliability. Engineered with specialty fillers such as silica, barium sulfate, carbon, glass microspheres, and proprietary blends, these asbestos-free sheets provide tailored performance for acids, caustics, solvents, chlorine, and aggressive process chemicals. The GYLON® series offers proven smooth-sheet sealing, while the GYLON EPIX® line features a patented textured surface that improves compressibility and seals even on imperfect flanges. From 3500–3580 to the modern EPIX 3504, 3510, and 3522, Garlock PTFE materials are the trusted choice for demanding industries including chemical processing, power generation, pulp and paper, and food and pharmaceutical applications.

STANDARD PTFE

GYLON®

Smooth PTFE sheet.
Requires good flange surfaces and proper bolt load to seal effectively.
Long-proven in service, still widely specified.

GYLON EPIX™

Same PTFE formulation (same filler, same chemical resistance).
Hexagonal textured surface:
- Increases compressibility → conforms better to imperfect, warped, or pitted flanges.
- Reduces creep relaxation → less bolt re-torque required.
- Allows sealing at lower bolt loads (important in older equipment or large diameter flanges).
Basically, a performance upgrade in real-world installation conditions.

SPECIALTY PTFE

GYLON® BIO-LINE® – for sanitary & regulated industries
GYLON® ONE-UP® – universal chemical service

Garlock PTFE Gaskets

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Material Number	Description	Datasheet
GYLON® 3500	The GYLON® Style 3500 is a high performance, silica filled PTFE sheet material designed for use with strong acids, solvents, hydrocarbons, and other aggressive media.	GYLON® 3500 Datasheet
GYLON® 3501-E	GYLON® 3501-E is the first choice for universal applications in the chemical and petrochemical industries. The combination of high pressure/temperature (P x T) and minimal cold flow far exceeds the performance of conventional PTFE.	GYLON® 3501-E Datasheet
GYLON® 3502	Garlock GYLON® 3502 is a PTFE gasket sheet filled with glass microspheres, designed to deliver excellent chemical resistance, enhanced compressibility for sealing on softer flanges, and proven compatibility in oxygen service.	GYLON® 3502 Datasheet
GYLON® 3503	Garlock GYLON® 3503 is an aluminosilicate-filled PTFE gasket sheet engineered for strong caustics, chlorine, and hydrofluoric acid, offering reliable sealing performance and safe use in oxygen service applications.	GYLON® 3503 Datasheet
GYLON EPIX™ 3504	GYLON EPIX® Style 3504 is a high performance, aluminosilicate microsphere filled PTFE sheet material designed for use in many acids, some caustics, as well as hydrocarbons, refrigerants, and more. GYLON EPIX® will provide superior functional performance by combining the traditional attributes of GYLON® with an innovative surface design.	GYLON EPIX™ 3504 Datasheet
GYLON EPIX™ 3505	GYLON® 3505 – A PTFE sheet filled with aluminosilicate and glass fibers, designed for improved stability and creep resistance in aggressive chemical and caustic service.	GYLON EPIX™ 3505 Datasheet
GYLON® 3510	GYLON® 3510 – A barium sulfate-filled PTFE sheet engineered for strong caustics, chlorine, and hydrofluoric acid with proven oxygen compatibility.	GYLON® 3510 Datasheet
GYLON EPIX™ 3510	GYLON EPIX® 3510 – A textured PTFE gasket with barium sulfate filler, combining broad chemical resistance with enhanced compressibility for sealing on imperfect flanges.	GYLON EPIX™ 3510 Datasheet
GYLON® 3522	The GYLON® Style 3522 gasket is made of 100% pure PTFE with no fillers or additives, making it ideal for the most demanding, high-purity requirements.	GYLONE® 3522 Datasheet
GYLON® 3530	GYLON® 3530 – A carbon-filled PTFE sheet that provides strength, thermal stability, and reliable sealing in steam, oxidizers, and high-temperature chemical service.	GYLONE® 3530 Datasheet
GYLON® 3540	GYLON® 3540 – A glass fiber-filled PTFE sheet designed for structural stability and creep resistance in hydrocarbons, refrigerants, and industrial fluids.	GYLONE® 3540 Datasheet
GYLON® 3545	GYLON® 3545 – A highly compressible PTFE sheet formulated to seal damaged or irregular flanges while maintaining excellent chemical resistance.	GYLONE® 3545 Datasheet
GYLON® 3560	GYLON® 3560 – A mineral-filled PTFE sheet developed for electrical insulation and chemical resistance in niche industrial applications.	GYLONE® 3560 Datasheet
GYLON® 3561	GYLON® 3561 – A denser mineral-filled PTFE sheet offering reduced compressibility and enhanced sealing stability for specialty chemical and electrical service.	GYLONE® 3561 Datasheet
GYLON® 3565	GYLON® 3565 Hi-Temp – A high-temperature PTFE gasket sheet designed to maintain chemical resistance and sealing performance in elevated heat environments.	GYLONE® 3565 Datasheet
GYLON BIO-LINE®	GYLON BIO-LINE® – A PTFE gasket family designed for hygienic sealing in food, beverage, pharmaceutical, and biotech equipment, meeting FDA, USP Class VI, and 3-A Sanitary standards.	GYLONE BIO-LINE® Catalog
GYLON ONE-UP®	GYLON ONE-UP® – A universal PTFE gasket that combines broad chemical compatibility with mechanical stability, reducing the need for multiple gasket types in plant operations.	GYLONE ONE-UP® Catalog

Frequently Asked Questions: Garlock PTFE Gaskets

What are Garlock GYLON® PTFE gaskets?

GYLON® gaskets are filled PTFE sheet materials designed for superior chemical resistance and sealing reliability. Different fillers such as silica, barium sulfate, carbon, and glass microspheres tailor performance for specific media like acids, caustics, solvents, and hydrocarbons.

How is GYLON EPIX® different from standard GYLON®?

GYLON EPIX® gaskets feature a patented hexagonal textured surface that increases compressibility and improves sealing on imperfect or warped flanges. The chemistry is the same as standard GYLON® grades (e.g., silica-filled, barium sulfate-filled), but the surface design enhances performance in challenging flange conditions.

Which Garlock PTFE gasket should I choose for acids and solvents?

For strong acids, GYLON® 3500 or GYLON EPIX® 3504 (silica-filled) are ideal. For broad chemical service including solvents and caustics, GYLON® 3520, GYLON® 3580, or GYLON EPIX® 3522 provide excellent resistance. Always consult Garlock’s chemical compatibility charts for exact recommendations.

What gasket is best for caustics, chlorine, or hydrofluoric acid?

GYLON® 3510 and GYLON EPIX® 3510 (barium sulfate-filled PTFE) are engineered for harsh caustics, chlorine service, and hydrofluoric acid. These grades maintain tight seals while resisting chemical attack.

What is GYLON® BIO-LINE® used for?

BIO-LINE® PTFE gaskets are designed for regulated industries including food, beverage, pharmaceutical, and biotech. They comply with FDA, USP Class VI, and 3-A Sanitary standards, ensuring safe and hygienic sealing in sanitary equipment.

What is the advantage of GYLON® ONE-UP®?

ONE-UP® is a universal PTFE gasket that combines broad chemical resistance with strong mechanical properties. It reduces the need to stock multiple gasket types, making it a cost-effective choice for plants that want one material for a wide range of applications.

What industries use Garlock PTFE gaskets?

Garlock PTFE gaskets are trusted in chemical processing, power generation, pulp and paper, oil and gas, semiconductor, food and beverage, and pharmaceutical manufacturing—anywhere reliable sealing and low emissions are critical.