Expanded PTFE Gasket Sheet Material
Product Description
Product Detail
A Multidirectionally Expanded PTFE Gasket Sheet That Seals Rough Flanges Without High Bolt Load
Kaxite Expanded PTFE Gasket Sheet Material is made from 100% virgin PTFE through a proprietary expansion process that creates a uniform, highly fibrillated microstructure with equal tensile strength in all directions. Unlike skived or moulded PTFE sheet, the expanded structure is softer, more compressible and better able to fill the pits and machining marks on a rough flange face. The material seals aggressive chemicals across the full pH 0–14 range — except molten alkali metals and elemental fluorine — and complies with FDA food contact regulations and EU 1935/2004.
Expanded PTFE vs Standard PTFE — What Changes on the Flange
Technical Data Sheet
| Property | Test Method | Value |
|---|---|---|
| Color | — | White |
| Density | ASTM D792 | 0.75 – 0.95 g/cm³ |
| Operating temperature | — | -240°C to +260°C |
| Compressibility | ASTM F36 | 45% |
| Recovery | ASTM F36 | 12 – 13% |
| Creep relaxation | ASTM F38 | 35 – 36% |
| Sealability (Nitrogen) | ASTM F37B | 0.15 ml/hr |
| Sealability (Fuel A) | ASTM F37B | 0.02 ml/hr |
| Service pressure | — | Full vacuum to 19 MPa |
| Tensile strength (both directions) | ASTM D638 | 16 – 17 MPa |
| Weather resistance | — | Excellent |
| Chemical resistance | — | Excellent — pH 0–14 |
| Standard sheet size | — | 1500 × 1500 mm |
| Thickness range | — | 0.5 – 6.0 mm |
| Food contact compliance | — | FDA and EU 1935/2004 |
| Documents | — | Download TDS and free sample available on request |
Where Expanded PTFE Gasket Sheet Is Used
Flange and vessel gaskets handling aggressive solvents, acids, alkalis and hydrocarbons where a rigid PTFE sheet would not compress onto the flange face.
FDA-compliant gaskets for fermentation tanks, transfer lines and filler heads where the sheet must not contaminate or discolor the product.
Gaskets for reactors, filter housings and sterile transfer lines where EU 1935/2004 compliance and clean release are required.
Glass-lined reactors, FRP flanges and old or pitted steel flanges where the conformable sheet takes up surface irregularities without high bolt load.
Steam, condensate and cooling water flange joints in thermal and combined-cycle plants where temperature cycling is routine.
Process water, chemical recovery and pulp line gaskets where the sheet must resist aggressive media and continuous thermal cycling.
Seawater and fuel line flanges where a gasket must resist chloride attack, vibration and temperature swings without cold flow.
Supplied as 1500 × 1500 mm sheet for in-house cutting, or as finished gaskets punched to drawing for OEM assembly lines.
Request an Expanded PTFE Gasket Sheet Quotation
Send us the thickness, sheet size, quantity and whether you need sheet stock or finished gaskets punched to drawing. We reply within 24 hours with FOB price, lead time and a free sample offer for qualified buyers.
Frequently Asked Questions
It is a gasket sheet made from 100% virgin PTFE that has been expanded through a proprietary process to create a highly fibrillated microstructure. The expansion makes the sheet softer, more compressible and more dimensionally stable than skived or moulded PTFE sheet, so it seals rough and irregular flange faces without requiring high bolt load.
Skived PTFE is cut from a moulded billet and has a rigid, linear polymer structure. Expanded PTFE has a fibrillated network with equal tensile strength in all directions, so it conforms to rough surfaces, compresses at lower bolt load, and resists creep and cold flow far better under sustained temperature and pressure.
The operating temperature range is -240°C to +260°C. Service pressure is from full vacuum to 19 MPa. Density is 0.75–0.95 g/cm³, compressibility is 45% and recovery is 12–13% to ASTM F36.
It seals all aggressive chemicals over the entire pH 0–14 range, with the exception of molten alkali metals and elemental fluorine. It is chemically inert to acids, alkalis, solvents, hydrocarbons, steam and most process media.
Yes. The sheet complies with FDA regulations for food contact and with EU 1935/2004. Because it is made from 100% virgin PTFE without fillers or pigments, it will not contaminate or discolor the end product.
Standard sheet size is 1500 × 1500 mm in thickness from 0.5 mm to 6.0 mm. Custom sheet sizes and thicknesses are available on request, and the sheet can be punched or cut into finished gaskets to drawing.
Yes. Kaxite is an expanded PTFE gasket sheet manufacturer and supplier in China, supporting wholesale orders, custom sheet sizes, private label packing and OEM service. Quotation is normally returned within 24 hours.
Yes. Free samples of the expanded PTFE gasket sheet are offered to qualified buyers so the flexibility, compressibility, surface finish and white color can be checked before a volume order.