Expanded PTFE
Gaskets
for Chemical &
Industrial Flanges
GORE™ expanded PTFE sealing solutions for PVC, CPVC, FRP, steel, and glass-lined flanges. Distributed by LibertyCES via Allied Fluid Products — West Coast's leading GORE supplier. NSF 61, FDA, and SPCC compliant.
Expanded PTFE Gaskets — The Engineering Answer
Expanded PTFE gaskets are chemically resistant, compressible sealing materials made from 100% expanded polytetrafluoroethylene (ePTFE). They seal steel, PVC, CPVC, FRP, glass-lined, and warped flanges where low bolt load, broad chemical compatibility, and long-term leak-free reliability are critical.
Unlike rubber or compressed fiber gaskets, ePTFE has no fillers, no binders, and no elastomers — making it inert across virtually the entire pH range. LibertyCES supplies and specifies GORE expanded PTFE sealing solutions for chemical processing, municipal water treatment, OEM skid builds, and industrial field repairs across the West Coast and nationwide USA.
Why Engineers Specify Expanded PTFE
- Seals PVC, CPVC, FRP, steel, stainless, and glass-lined flanges — one gasket format, mixed flange inventory
- Chemically inert across 98%+ of industrial fluids — acids, bases, oxidizers, solvents, hypochlorite
- No cold flow, no creep — maintains seal under pressure cycling and thermal shifts
- Conforms to warped, irregular, or damaged flange faces under low bolt load
- NSF 61 and FDA approved — safe for potable water and food contact applications
- GORE product line covers universal pre-cut, custom sheet, form-in-place tape, and narrow sealing formats
Expanded PTFE Sealing Products
LibertyCES distributes the full GORE expanded PTFE sealing line through Allied Fluid Products. Four formats. Every flange condition.
GORE™ UPG — Universal Pipe Gasket
High-performance expanded PTFE gasket engineered to seal steel, PVC, CPVC, fiberglass, and glass-lined flanges. One standard spec across mixed flange materials — zero leaks.
GORE™ GR Sheet — Custom-Cut Gasketing
Pure ePTFE gasket sheet cut on-site for oversized flanges, tank manways, and OEM systems where standard pre-cuts won't fit. Food and chemical safe.
GORE™ Joint Sealant — Form-In-Place Tape
ePTFE rope gasket for irregular, large-diameter, or emergency flanges. Peel, wrap, and torque — no cutting, no measuring, no downtime.
GORE™ Series 500 — Narrow Sealing Tape
Ultra-narrow ePTFE sealing tape for instruments, sampling ports, and compact OEM enclosures where standard gaskets are too large. Peel-and-stick install.
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 eliminates inventory mismatches |
| GORE GR Sheet | Custom-cut gaskets for non-standard sizes | Tank manways, large flanges, odd OEM dimensions | Field flexibility — cut to any shape on-site |
| GORE Joint Sealant | Form-in-place sealing, emergency installs | Large, irregular, damaged, or corroded flanges | No cutting required — seals in minutes |
| GORE Series 500 | Narrow sealing surfaces, instrumentation | Instruments, sampling ports, compact OEM nozzles | Precision sealing where standard gaskets won't fit |
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 doesn't cover the full sealing face.
Choose Joint Sealant When
The flange is irregular, damaged, large-diameter, or requires same-day emergency sealing without downtime.
Choose Series 500 When
The sealing surface is narrow or space-restricted — instruments, ports, or compact OEM enclosures where a standard gasket is too large.
Expanded PTFE vs. Other Gasket Materials
Understanding how ePTFE 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 (ePTFE) | Excellent — pH 0–14 | Yes | Yes — conforms | Ideal | Chemical, water, PVC/FRP flanges |
| Rubber (EPDM, Neoprene, Buna) | Moderate — elastomer dependent | Yes | Limited | Risk of over-compression | Water service, 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 — can crack flange | High-pressure metallic flanges only |
| Compressed Fiber | Limited — degrades in many chemicals | Moderate | Limited | Marginal | General utility, non-critical service |
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/caustic transfer piping. One ePTFE gasket spec across steel, CPVC, and FRP piping. Preferred for pH-aggressive media and mixed-material piping systems.
Municipal Water & Wastewater
NSF 61-compliant expanded PTFE gaskets for potable water systems, chlorination lines, and biosolids piping. Approved for direct contact with drinking water. Used in water treatment plants, pump stations, and distribution systems nationwide.
OEM Skid Builds
Standardize gasket inventory across mixed-material skid piping — CPVC chemical dosing, stainless instrumentation, and FRP headers — with a single UPG spec. Eliminates gasket mismatches during field assembly and commissioning.
Tank Manways & Large Flanges
Cut GORE GR Sheet to size for non-standard manway flanges on chemical storage tanks and neutralization vessels. Joint Sealant for immediate seals on difficult geometries. Field-flexible solution for any tank cover or large-diameter flange condition.
Agricultural Chemical Transfer
Chemical-resistant sealing on fertilizer, herbicide, and fumigant transfer lines. ePTFE handles the broad chemical range of ag-service without compatibility concerns. Suitable for fertigation injection systems and field chemical handling.
Field Repairs & Emergency Installs
GORE Joint Sealant creates immediate seals on corroded, warped, or damaged flanges without cutting or measuring — used for unplanned downtime events and emergency maintenance. No pre-cut gaskets required. Seals in minutes on any flange geometry.
Expanded PTFE Works Across Every Flange Material
Most gasket failures in chemical systems happen because the wrong material was specified for the flange type. Rubber over-compresses fragile plastic flanges. Skived PTFE won't seal warped FRP. Spiral wound demands bolt loads that crack CPVC.
Expanded PTFE conforms. Its low-stress sealing mechanism means it works where other gasket materials fail — across the broadest range of flange materials in industrial use.
Common Gasket Failure Modes in Chemical Service
Most flange leaks are not product defects — they are specification or installation errors. Understanding these failure modes is the first step to eliminating them.
Chemical Incompatibility
Rubber elastomers swell, degrade, or extract contaminants when exposed to chemicals outside their compatibility range. ePTFE eliminates this class of failure across virtually all industrial media.
Over-Torquing Plastic Flanges
Compressed fiber and spiral wound gaskets require bolt loads that crack PVC, CPVC, and FRP flanges. ePTFE seals under significantly lower bolt load — protecting fragile flange materials.
Cold Flow & Creep
Inferior PTFE gaskets lose sealing force over time as the material creeps under bolt load. GORE ePTFE is engineered with zero cold flow — maintaining seal integrity under long-term static and cycling conditions.
Warped Flange Faces
Hard gasket materials cannot conform to warped or irregular sealing surfaces — leaving leak paths. ePTFE's conformability is specifically engineered to bridge surface irregularities under low bolt load.
Thermal Cycling Loosening
Pressure and temperature cycling causes bolt relaxation and gasket compression changes. ePTFE maintains its sealing force through thermal and pressure cycles where elastomers harden or compress permanently.
Wrong Gasket Format
A standard pre-cut gasket on a non-standard manway or irregular tank flange will not seal reliably. GORE GR Sheet and Joint Sealant exist specifically for these conditions — cut-to-size or form-in-place.
James
Riggins
Founder & Lead Spec Solutions Partner
"In chemical service, gasket failure is rarely just a gasket problem. It's 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. Getting that right the first time is the whole job."
— James Riggins, Founder, LibertyCES | 30+ Years Field Experience
James Riggins has specified fluid handling systems — chemical feed, water treatment, and industrial process — for 30+ years with zero specification failures. He brings that same discipline to every sealing recommendation LibertyCES makes.
LibertyCES supplies GORE expanded PTFE sealing products through Allied Fluid Products, a leading West Coast GORE distributor. That supply relationship gives LibertyCES access to the full GORE product line — UPG, GR Sheet, Joint Sealant, and Series 500 Tape — and direct manufacturer technical resources for complex or unusual applications.
When a plant manager calls James about a flange that keeps leaking after three gasket changes, the first question isn't "which gasket?" — it's "why is this happening?" The answer is almost always upstream of the gasket itself. That kind of systems thinking is what separates a specification from a guess.
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 our Allied Fluid Products supply relationship, we provide fast-ship access to the full GORE sealing line with engineering support for application specification — not just order fulfillment.
Related Industrial Sealing & Chemical System Resources
Expanded PTFE Gasket FAQ
Are expanded PTFE gaskets good for chemical service?
Yes. Expanded PTFE is chemically inert and widely used across acids, bases, oxidizers, solvents, hypochlorite, and mixed chemical environments. Unlike rubber elastomers, ePTFE has no compatibility limitations across most industrial media. Final selection should still account for temperature, pressure, flange condition, and media concentration. LibertyCES verifies compatibility before specification — call James at 559-395-5500.
Can one PTFE gasket seal PVC, CPVC, FRP, and steel flanges?
In most applications, yes. GORE UPG is specifically engineered as a universal pipe gasket for multiple flange materials — especially where low bolt load and conformability are important. It's the standard recommendation for chemical plants, water treatment systems, and OEM skid builds that use mixed flange materials throughout their piping systems.
What gasket is best for warped or damaged plastic flanges?
Expanded PTFE gaskets are the preferred choice. ePTFE compresses and conforms under lower bolt loads than harder materials, bridging surface irregularities without requiring high clamping force — which would crack fragile PVC, CPVC, or FRP flanges. For severely warped or irregular geometries, GORE Joint Sealant (form-in-place rope format) provides even greater conformability.
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. It's also the go-to for emergency sealing situations — just peel, wrap, and torque without any cutting or prep. Joint Sealant is rated to 3,000 psi and compatible with pH 0–14 media.
What is the difference between expanded PTFE and regular (skived) PTFE gaskets?
Skived PTFE is machined from solid PTFE rod or sheet — it is harder and less conformable, prone to cold flow under bolt load, and does not seal well on warped or irregular surfaces. Expanded PTFE (ePTFE) is processed to create a soft, multi-directional fiber structure — it compresses under lower bolt loads, conforms to surface irregularities, and resists cold flow. For chemical service on plastic or FRP flanges, ePTFE significantly outperforms skived PTFE.
Does LibertyCES help with gasket specification and selection?
Yes. James Riggins personally reviews gasket applications — matching product format to flange material, chemical media, pressure, temperature, bolt load, and field installation conditions. LibertyCES does not sell parts from a catalog. Bring your system parameters and we will verify the right specification before you commit to a purchase. Call 559-395-5500 or email james@libertyces.com.
Are GORE expanded PTFE gaskets NSF 61 and FDA approved?
Yes. GORE UPG, GR Sheet, and Joint Sealant are NSF 61 certified for potable water contact and FDA compliant for food-grade applications. This makes them suitable for municipal water treatment systems, food and beverage processing piping, and any application with direct contact requirements for drinking water or food-safe media.
Talk to James.
Get the Right Gasket Spec.
"We look at the media, the flange material, the surface condition, pressure, temperature, and maintenance history before recommending a gasket. Getting it right the first time is the whole job."
Upload your flange size, material, chemical media, temperature, and pressure. James Riggins answers the Engineering Line directly.