1)100% silicone rubber materials,safety. 2)resistant to oil,fluid,flue 3)long service time. 4)waterproof 1)Various material available:SILICONE,NR,NBR,EPDM,CR,IIR,VR(F) ,SBR ,VITON,etc 2)Safe and hygienic ,meet ROHS directive and other international test standards. 3)Excellent resistant to ozon,oxygen,mineral,oil,synthetic hydraulic fluid, fuels,solvents&chemicals. 4)Low permeability to gas ,air ...