... resistant. Details about rubber washer: 1. Materials: comply to ROHS, NR, or NBR, Silicone (VMQ), EPDM, Viton, etc., 2. Hardness ... film paper packed outside with water proof. Strength of NR MaterialAbrasion-Resistance excellentImpact Strength Resistance goodTensile Strength excellentElongation goodElasticity excellentLow ... .5. Small order quantity is welcomed. Abrasion-Resistance NR rubber washer