It is used as a diaphragm in gaskets, machinery, decanters and carburettors in industrial oil, fuel and places where strength is required up to 150 ° C. There are types of bare (silk or cortex) or non-bare. Thickness 0.30 mm.- 4 mm. between 400x400 mm. Nitrile type polymer is used and the fabric-free breaking strength is min: 140 kg / cm2 and it is suitable for dynamic working.