Block pack Material: parts A,C,E are made of ... of nitrile butadiene rubber(NBR).Working Temperature : -40 to 100 centigrade in static stateCharacteristics: Special design of clamping die and rubber ... ultra-strong stretching resistance, waterproof, dustproof,and high ability to resist salt,acid,alkali, alcohol,grease and general solvent. ... as special colors that can be designed at request. block pack