SBR flat rubber washer: 1. Material: rubber 2. passed NSF certificate 3. OEM welcome SBR flat rubber washer:Our product passed NSF certificate1. Materials: NBR, SI, HNBR ,ACM ,SBR ,FPM ,CR ,BR, IIR ,NR ,IR PU etc, just as your request.2. Temperature ranqe: -100-260 celsius degrees3. Hardness: between 30-80 shore A4. Color: black, transparent, green, red, yellow, etc5. Certifications: all ...