Teflon (PTFE) fibres
Teflon is the trade name for PTFE (polytetrafluoroethylene) fibres. They are used in seals and gaskets to prevent sticking. They are also used in packings at low shaft speeds where the temperature limit of 2600C can be accommodated. The high thermal expansion of Teflon can be a problem in various applications.
When compared against chrysotile asbestos their chemical resistance is superior, but their cost is much higher, their strength is lower and their heat resistance is lower. The cost of Teflon fibre varies from 10.00 to 25.00 $/kg.
|Tensile strength||170-320 Mpa|
|Temperature limit||2000 C|
Polyacrjlortitrile (PAN) fibres have been used to replace asbestos in fibre-cement sheet products with a limited degree of success. The cost of PAN fibre ranges from 2.00 to 3.00$/kg.
|Tensile strength||200-320 MPa|
|Elongation at break; dry||10-50%|
|Elongation at break wet||26-60%|
|Temperature limits||150-3000 C|