... We specialize in designing and manufacturing all the oil seal, O-ring, rectangular-ring, rubber gasket, rubber ... agricultural machinery, home appliance, trucks, buses, trailers, heavy duty machine, pump and other equipment.3) Material: NBR, FKM (VITON ... tension meterThickness gaugeHardness gaugeLow-temperature brittleness meterMooney viscometerOil seal dynamic performance tester 5) We did pass the ...