... FDA, NSF, WRAS, etc. Details of silicon rubber seals for glass bottle:1. Materials: comply to ROHS, ... Silicone (VMQ), or NBR, EPDM, Viton, etc.2. Temperature: -40~ ... °C. 3. Hardness: 20 to 80 shore A or as your requested. 4. Tolerance: strictly upon international ... transparent, green, red, yellow, grey, purple, pink or as your requested.6. Small order is accepted.7. ...