... NBR(X5)Fresh water,Salt, Strong base,Natural gas, Oil. Oil resistant-20°C~+100°CShort time +110°C Viton(X7)Fresh water ... , Salt,Weak base,Weak acid,Natural gas, Oil,Food. High performance resistant, corrosion resistant-20°C~+200°CShort time +250°C PTFEFresh ... water, Sea water, Salt,Weak base,Weak acid,Natural gas, Oil,Food ...