PTFE Gaskets

Universal chemical-resistant flange seal

Virgin, filled and expanded PTFE gaskets offering near-universal chemical resistance and high purity for the most aggressive flange duties.

Near-universal chemical resistance across pH 0–14
Chemically inert and non-contaminating for high-purity duty
ePTFE conforms to glass-lined, GRP and warped flanges
Filled grades resist cold-flow and creep under load
FDA and USP Class VI compliant grades available

Temperature: -200°C to +260°C
Pressure: Up to 80 bar (filled / ePTFE)
pH range: 0 – 14

White virgin PTFE flange gasket alongside an expanded-PTFE envelope gasket — GasketsREF · ptfe-gasket

Technical DatasheetSPEC

The numbers, on the record

Every figure below is the specification we hold ourselves to — material, service envelope, media compatibility and conformance. Download it as a standalone document for your dossier.

SealGuard

Technical Datasheet

Doc No.: DS-PTFE-GASKET
Revision: Rev. A
Issue: 2026-Q3
Class: Gaskets

PTFE Gaskets

Universal chemical-resistant flange seal

01

Material & Construction

Virgin, expanded or mineral-filled PTFE (PTFE envelope over fibre insert optional)

02

Service Envelope

Temperature range	-200°C to +260°C
Pressure rating	Up to 80 bar (filled / ePTFE)
pH range	0 – 14

03

Media Compatibility

Strong acidsStrong causticsSolventsChlorine & oxidisersHigh-purity media

04

Dimensions & Sizing

DN15–DN600; 1.5–3.0 mm sheet, ePTFE tape and envelope forms; full-face & ring profiles

05

Standards & Conformance

DIN 28091-4
ASME B16.21
EN 13555 (tested)

06

Certifications

ISO 9001
FDA 21 CFR 177.1550
USP Class VI

07

Additional Specifications

Density (virgin)	2.1–2.2 g/cm³
Form	Sheet-cut · ePTFE tape · envelope

Filler options	Glass / barium sulphate / silica
Creep resistance	Filled grades for higher loads

Specify & QuoteORDER

Build your line item

Choose the material grade and size that match your duty, set a quantity, and add a fully-specified line to your quote. No prices, no obligation — our engineers confirm specification and lead time on every enquiry.

01

Material grades

Virgin PTFE
Expanded PTFE (ePTFE)
Glass-filled PTFE
Barium-sulphate-filled PTFE
Silica-filled PTFE (caustic service)

02

Sizes & configurations

DN15–DN600 flange gaskets
ASME Class 150–300 / PN10–PN40
1.5 / 3.0 mm sheet-cut
ePTFE tape form (self-adhesive)
Envelope gasket (PTFE over insert)
Custom shapes to drawing

In ServiceUSE

Where it holds the line

When the process chemistry rules out fibre and graphite, PTFE seals where nothing else will. SealGuard PTFE gaskets resist virtually the entire pH range and the most aggressive acids, caustics and solvents while staying chemically inert and contamination-free for high-purity duty. Expanded-PTFE (ePTFE) forms conform to irregular and glass-lined flanges under modest bolt load, while filled grades add creep resistance for higher pressures — giving the chemical and pharmaceutical plant a single, trusted sealing material for its hardest joints.

Typical applications

01Aggressive acid and caustic process lines
02Glass-lined reactor and vessel flanges
03High-purity pharmaceutical and fine-chemical duty
04Chlorine, solvent and oxidiser service
05Food and beverage hygienic joints

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Let’s specify it

Specify this seal for your service.

Send us the media, temperature, pressure and motion for your duty and our engineers will confirm the right material grade, size and standard for your application.

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