ASME B16.21 · Chemical & pharma service · Mumbai, IndiaPTFE Gaskets
Chemically inert, clean and non-stick. Cut PTFE, filled PTFE and PTFE envelope gaskets for acids, solvents, pharma and food lines, from small rings to large tank and manhole gaskets.
PTFE outside. Strength inside.
Solid PTFE creeps under load. An envelope gasket puts a thin PTFE jacket on the wetted side and a resilient insert inside, so you get PTFE chemical resistance with the recovery of a fibre or rubber gasket.
3D renderPTFE envelope
V-type, milled or slit PTFE jacket that is the only material the process fluid touches.
Insert
Non-asbestos sheet, rubber or corrugated metal inside the envelope gives bolt-load recovery and blow-out resistance.
Four ways to use PTFE.
Pick by pressure, temperature, flange condition and how clean the service has to be.
Virgin cut
Die cut or CNC cut from virgin PTFE sheet. Cleanest choice for food and pharma.
Food & pharmaFilled PTFE
Glass, carbon, graphite or bronze filled PTFE for less creep and better load bearing.
Less creepEnvelope
PTFE jacket over a resilient insert. V-type, milled or slit envelopes for glass-lined and lined equipment.
Lined vesselsExpanded PTFE
Soft, highly compressible expanded PTFE sheet and tape for uneven or fragile flanges.
Damaged flangesPick the grade, not just "PTFE".
Virgin PTFE is the most inert. Fillers reduce cold flow and raise load capacity but each one changes chemical resistance, so match the filler to the fluid.
PTFE grades
Typical range -200 to 260 °C
Envelope inserts
Inside PTFE envelope gaskets
Large sizes too. Big PTFE rings and tank and manhole gaskets are made in one piece or welded from segments.
Clean, white, ready to fit.
Real PTFE gaskets from our works, from small cut rings to large full face gaskets.
See all photos in our gasket gallery →
Full face, oversize, to drawing.
The PTFE gaskets you cannot buy off the shelf.
Full face with bolt holes
Full face PTFE gaskets for flat face flanges, FRP and lined pipe, drilled to your standard.
Large diameter
Large rings for tanks, reactors and manholes, in one piece or welded segments.
Strip & tape
PTFE strip and expanded PTFE tape for form-in-place sealing of large or odd flanges.
Specifications
- Standards
- ASME B16.21, DIN EN 1514-1, IS, or to drawing
- Types
- Virgin cut, filled PTFE, envelope, expanded PTFE
- Envelopes
- V-type, milled (machined), slit
- Shapes
- Ring (IBC), full face, oval, rectangular, to drawing
- Fillers
- Glass, carbon, graphite, bronze
- Inserts
- Non-asbestos sheet, EPDM, Viton, corrugated SS
- Temperature
- Typically -200 to 260 °C depending on grade
- Thickness
- 1.5 mm to 6 mm typical; others on request
- Inspection
- Third-party inspection by LR, BV, TÜV, SGS and others
gasket vendor
Chosen for chemical, pharma and refinery service
PTFE gaskets, answered.
What is a PTFE gasket used for?
PTFE gaskets seal flanges carrying aggressive chemicals, acids, solvents and clean media in chemical, pharma and food plants, because PTFE resists almost every chemical and does not contaminate the product.
What is the difference between virgin and filled PTFE?
Virgin PTFE is pure and the most chemically resistant but creeps under load. Filled PTFE adds glass, carbon or other fillers to reduce creep and carry more bolt load, at the cost of some chemical resistance.
What is a PTFE envelope gasket?
A gasket with a thin PTFE jacket around a resilient insert. Only the PTFE touches the fluid, while the insert gives the gasket strength and recovery. It is widely used on glass-lined and lined equipment.
What temperature can PTFE gaskets handle?
Typically from about -200 °C up to 260 °C, depending on the grade, pressure and flange design.
What do you need to quote PTFE gaskets?
Size or drawing, flange standard and class, gasket type and grade, thickness, the fluid and temperature, and quantity.
Send your drawing.
Get a price.
Tell us the gasket type, size or drawing, material, pressure class, standard and quantity. Our engineers reply with price and delivery.
Quick enquiry
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