GORE™ Expanded PTFE Sealing Products
Expanded PTFE Gaskets for Chemical & Industrial Flanges
GORE™ expanded PTFE sealing solutions for PVC, CPVC, FRP, steel, stainless, and glass-lined flanges. LibertyCES helps West Coast and USA plants specify UPG, GR Sheet, Joint Sealant, and Series 500 gasket tape for chemical service, low bolt-load sealing, and difficult flange conditions.
What Are These?
Expanded PTFE gaskets are chemical-resistant flange seals for difficult industrial service.
Expanded PTFE gaskets are compressible sealing materials made from expanded polytetrafluoroethylene. They are used on steel, PVC, CPVC, FRP, stainless, glass-lined, and warped flanges where broad chemical resistance, low bolt-load sealing, and long-term reliability are critical.
Unlike rubber or compressed fiber gaskets, expanded PTFE contains no elastomeric binder system. It is commonly specified when chemical compatibility, flange fragility, imperfect sealing faces, or mixed-material piping make standard gasket selection risky.
Chemical Service Answer
What is the best gasket material for chemical service?
Expanded PTFE is often the best gasket material for aggressive chemical service because it combines broad chemical resistance, low bolt-load sealing, and conformability on imperfect flange faces. It is especially useful on PVC, CPVC, FRP, steel, stainless steel, and glass-lined flanges where rubber, compressed fiber, or skived PTFE may fail because of chemical attack, creep, or poor surface conformity.
Material Difference
What is the difference between expanded PTFE and regular PTFE gaskets?
Regular skived PTFE is harder and less conformable, which can make it difficult to seal warped or irregular flanges. Expanded PTFE has a softer, fibrillated structure that compresses under lower bolt load and conforms to imperfect flange faces while maintaining broad chemical resistance.
Plastic + FRP Flanges
What gasket should be used on PVC, CPVC, and FRP flanges?
PVC, CPVC, and FRP flanges usually need a gasket that seals under low bolt load because over-torquing can crack or distort fragile flange materials. Expanded PTFE gaskets are commonly specified because they conform to the flange face without requiring the high clamp load needed by harder gasket materials.
GORE™ Product Line
Expanded PTFE Sealing Products
LibertyCES distributes the GORE expanded PTFE sealing line through Allied Fluid Products. Four formats cover pipe flanges, custom-cut gaskets, form-in-place field sealing, and large steel flange gasket tape.
GORE™ UPG — Universal Pipe Gasket
Expanded PTFE universal pipe gasket engineered to seal steel, PVC, CPVC, fiberglass, stainless, and glass-lined flanges with strong chemical resistance and low bolt-load conformability.
GORE™ GR Sheet — Custom-Cut Gasketing
Pure expanded PTFE gasket sheet cut for oversized flanges, tank manways, non-standard equipment, and OEM systems where standard pre-cut gaskets do not fit.
GORE™ Joint Sealant — Form-In-Place Gasket
Form-in-place expanded PTFE sealant for irregular, large-diameter, damaged, non-standard, or emergency flanges where measuring and cutting a gasket is impractical.
GORE™ Series 500 — Gasket Tape for Large Steel Flanges
Expanded PTFE gasket tape for large steel flanges, vessel covers, tank manways, heat exchangers, baffles, and non-standard equipment flanges.
Specifier’s Guide
Which GORE Gasket Should You Use?
Use this table to match the correct expanded PTFE format to your flange condition, media, and installation type.
| Product | Best Use | Flange Type | Key Advantage |
|---|---|---|---|
| GORE UPG | Universal pipe gasket standardization across mixed flange materials | PVC, CPVC, FRP, steel, stainless, glass-lined | One gasket spec reduces inventory mismatches |
| GORE GR Sheet | Custom-cut gaskets for non-standard sizes | Tank manways, large flanges, odd OEM dimensions | Field flexibility — cut to shape on site |
| GORE Joint Sealant | Form-in-place sealing and emergency installs | Large, irregular, damaged, or corroded flanges | No cutting required — pressure-specific review recommended |
| GORE Series 500 | Gasket tape for large steel flange applications | Large steel flanges, vessel covers, manways, heat exchangers, baffles | Conformable tape format for large equipment flanges |
Choose GORE UPG When
You need one standardized gasket across mixed flange materials in a chemical plant, water treatment system, or skid build.
Choose GR Sheet When
The flange is oversized, non-standard, or field-cut and a pre-cut UPG does not cover the full sealing face.
Choose Joint Sealant When
The flange is irregular, damaged, large-diameter, or requires same-day field sealing after application review.
Choose Series 500 When
You need expanded PTFE gasket tape for large steel flanges, vessel covers, manways, heat exchangers, baffles, or non-standard equipment flanges.
Material Comparison
Expanded PTFE vs. Other Gasket Materials
Understanding how expanded PTFE compares to rubber, skived PTFE, spiral wound, and compressed fiber helps engineers select the right material for chemical and industrial service.
| Gasket Material | Chemical Resistance | Low Bolt Load | Warped Flanges | Fragile Plastic / FRP | Best For |
|---|---|---|---|---|---|
| Expanded PTFE | Excellent — broad pH 0–14 compatibility | Yes | Yes — conforms | Ideal | Chemical, water, PVC, CPVC, FRP, steel, glass-lined flanges |
| Rubber | Moderate — elastomer dependent | Yes | Limited | Risk of over-compression | Water service and low chemical exposure |
| Skived PTFE | Good, but less conformable | Moderate | Poor | May gap on warped faces | Clean, flat metallic flanges |
| Spiral Wound | Good | No — requires high bolt load | No | High risk on fragile flanges | High-pressure metallic flanges |
| Compressed Fiber | Limited — degrades in many chemicals | Moderate | Limited | Marginal | General utility and non-critical service |
Where It’s Used
Sealing Applications Across Industries
LibertyCES specifies GORE expanded PTFE sealing systems for chemical processors, municipal utilities, OEM builders, and industrial field crews across the West Coast and nationwide USA.
Chemical Processing Plants
Seal ANSI flanges on chemical dosing lines, neutralization systems, and acid or caustic transfer piping. One expanded PTFE gasket spec can support mixed-material piping systems.
Municipal Water & Wastewater
Expanded PTFE gaskets for potable water systems, chlorination lines, biosolids piping, pump stations, and distribution systems.
OEM Skid Builds
Standardize gasket inventory across mixed-material skid piping, including CPVC chemical dosing, stainless instrumentation, and FRP headers.
Tank Manways & Large Flanges
Use GR Sheet for non-standard manway flanges and Series 500 or Joint Sealant for large or difficult equipment flange conditions.
Agricultural Chemical Transfer
Chemical-resistant sealing for fertilizer, herbicide, and chemical transfer lines where compatibility is more complex than standard water service.
Field Repairs & Emergency Installs
GORE Joint Sealant can support rapid field sealing on corroded, warped, or damaged flanges when a pre-cut gasket is not practical.
Flange Compatibility
Expanded PTFE Works Across Common Industrial Flange Materials
Many gasket failures in chemical systems happen because the wrong material was specified for the flange type. Rubber can over-compress fragile plastic flanges. Skived PTFE may not conform well to warped FRP. Spiral wound gaskets may demand bolt loads that fragile materials cannot tolerate.
Expanded PTFE conforms. Its low-stress sealing behavior makes it useful across a broad range of flange materials and imperfect sealing surfaces.
Engineering Guidance
Common Gasket Failure Modes in Chemical Service
Most flange leaks are not just product defects. They are often compatibility, flange condition, bolt load, surface finish, or installation problems.
Chemical Incompatibility
Rubber elastomers can swell, degrade, or extract contaminants when exposed to chemicals outside their compatibility range.
Over-Torquing Plastic Flanges
Harder gasket materials may require bolt loads that crack PVC, CPVC, and FRP flanges.
Creep & Cold Flow
Some PTFE gaskets lose sealing force over time. GORE expanded PTFE is engineered for superior creep and cold-flow resistance.
Warped Flange Faces
Hard gasket materials may not conform to warped or irregular sealing surfaces, leaving leak paths.
Thermal Cycling Loosening
Pressure and temperature cycles can cause bolt relaxation and gasket compression changes.
Wrong Gasket Format
A standard pre-cut gasket on a non-standard manway or irregular equipment flange may not seal reliably.
Field Notes
James Riggins
Founder & Lead Spec Solutions Partner
“In chemical service, gasket failure is rarely just a gasket problem. It is a compatibility, flange condition, bolt load, or installation problem. We look at the media, the flange material, the surface condition, pressure, temperature, and how the system is actually being maintained before recommending a gasket.” — James Riggins, Founder, LibertyCES
LibertyCES supplies GORE expanded PTFE sealing products through Allied Fluid Products. That supply relationship gives LibertyCES access to GORE UPG, GR Sheet, Joint Sealant, and Series 500 gasket tape along with manufacturer technical resources for complex or unusual applications.
When a plant manager calls James about a flange that keeps leaking after multiple gasket changes, the first question is not “which gasket?” It is “why is this happening?” That systems thinking is what separates a specification from a guess.
Service Area
Expanded PTFE Gasket Support for West Coast & USA Industrial Systems
LibertyCES specifies and distributes GORE expanded PTFE sealing systems for industrial plants, water utilities, and OEM builders across the West Coast and nationwide United States.
Through the Allied Fluid Products supply relationship, LibertyCES provides access to the GORE sealing line with engineering support for application specification — not just order fulfillment.
Related Industrial Sealing & Chemical System Resources
Common Questions
Expanded PTFE Gasket FAQ
Are expanded PTFE gaskets good for chemical service?
Yes. Expanded PTFE is widely used across acids, bases, oxidizers, solvents, hypochlorite, and mixed chemical environments. Final selection should still account for temperature, pressure, flange condition, media concentration, and installation conditions.
Can one PTFE gasket seal PVC, CPVC, FRP, and steel flanges?
In many applications, yes. GORE UPG is designed as a universal pipe gasket for multiple flange materials, especially where low bolt load and conformability are important.
What gasket is best for warped or damaged plastic flanges?
Expanded PTFE gaskets are commonly specified because they compress and conform under lower bolt loads than harder materials, helping bridge surface irregularities without excessive clamping force.
When should I use GORE Joint Sealant instead of a cut gasket?
Use GORE Joint Sealant when the flange is irregular, large-diameter, damaged, non-standard, or when field conditions make measuring for a pre-cut gasket impractical. Pressure and temperature limits should be reviewed for the specific application.
What is the difference between expanded PTFE and regular skived PTFE gaskets?
Skived PTFE is harder and less conformable. Expanded PTFE has a softer fibrillated structure that compresses under lower bolt loads and conforms to surface irregularities while maintaining broad chemical resistance.
Does LibertyCES help with gasket specification and selection?
Yes. James Riggins reviews flange material, chemical media, pressure, temperature, bolt load, and field installation conditions before recommending a gasket. Call 559-395-5500 or email james@libertyces.com.
Are GORE expanded PTFE gaskets NSF 61 and FDA approved?
GORE sealing products include NSF 61 and FDA listed uses depending on product and application. LibertyCES can help verify which GORE product fits potable water, food-grade, chemical, or industrial service.
Engineering Consultation
Talk to James. Get the Right Gasket Spec.
Send the flange size, flange material, chemical media, temperature, pressure, and maintenance history. LibertyCES will help verify the right GORE expanded PTFE sealing product before you commit to a purchase.