Compressed syntetic fibre gasket sheets: the material

Compressed syntetic jointing sheets are manufactured from a viscous granular mixture of high-strength short fibres, heat-resistant fillers and elastomeric binders, which is vulcanised into sheet form, under the pressure of two counter-rotating steel rollers (calender).



The fibres are the most crucial component. They must have high modulus and tensile strength, thermal and chemical stability, and capacity to adhere with the other components. Aramid Kevlar® (above) and inorganic fibre (below) in a FASIT sheet, enlarged 1,000 times by a Scansion-Electro-Microscope. Well opened fibrils on the Kevlar® fibre surface allow interlocking with the elastomeric matrix, thereby imparting to the material excellent resistance against plastic deformation. This characteristic results in high stress retention and sealing performance of the gasket.