... to 300 degrees Hardness :25-80 shore A Food grade silicone lunch-box cap seal:1. Non-toxic, odorless, transparent, flame retardant, ... deformation;3. Not cracking, long life, resistant to high and cold temperature;4. It has a high tear strength ... and superior electrical performance5. Various sizes, colors, durometer could be available Food grade silicone lunch-box cap seal