... delivery & top quality 4) Professional service. Features of our rubber washer: · Working temperature: -100 to +300 degrees;· Hardness: 25 ... lube, oil, industrial, machine, etc;· High tensile Strength, Wear and tear resistance, Durable;· UL certification;· Rubber Material: NBR, HNBR, ... products are certified to ASTM, DIN, JIS, AMS and MIL standards. All specifications are controlled under the standard ...