Environmental Gasket Company LTD.

Polytetrafluoroethylene PTFE, a fluoropolymer with exceptional chemical resistance and is the most widely used plastic in the sealing industry. The only known chemical products to attack PTFE are liquid alkaline metals and free fluorine. It has a fairly good temperature range cryogenic to plus 260 oC, excellent electrical insulation properties, anti-stick, impact resistance and low coefficient of friction.

PTFE gasket sheeting products are manufactured by mixing pure PTFE powder with other fillers then sintering or extruding the gasket product. Virgin or pure PTFE sheets with no fillers are rarely used for gasket sheet materials as they tend to creep or cold flow under pressure. Creep which is defined as a loss of tightness, measurable by torque loss when the gasket is compressed, the gasket tends to change shape and cold flow resulting in a loss of bolt load, a loss of gasket compression and eventually a leak.

Because of this problem with pure PTFE gasket material, it is generally accepted that a filled PTFE gasket material will have superior performance. Glass is the most common filler used in PTFE sealing materials with others being carbon, graphite, bronze, etc. These fillers give the PTFE extra structural strength and creep resistance.

Environmental Gasket Company have a number of reinforced or filled PTFE gasket sheeting products that are suitable for various applications and can be provided in sheet or cut gasket formats.

PTFE provides numerous advantages as a sealing material:

• Chemical Resistant
• pH 0 – 14
• Temperature range -240oC to 260oC
• High Residual Stress
• Environmental Friendly
• Conforms to FDA Regulations
• Non aging and UV Resistant
• Non Flammable, and
• Vacuum Resistant


Please consult with your Environmental Gasket Company representative for full details on our PTFE gasket styles, materials, sizes and specifications.