Transparent silicone rubber, Durometer 60 Shore A. Temperature resistance: -60°C to +200°C. Temperature resistant short-time: +260°C. Dimension tolerances according to DIN ISO 3302-1 E2. Suitable for hose pumps. Biocompatability: Cytotoxicity (USP class 1-6) Hemolysis, Pyrogenicity, Allergisation, Cytotoxicity ISO 10993-1. Standards: Food safe, BFR XV, FDA CFR 21§ 177.2600