... range: -50degrees to 300 degrees Hardness :25-80 shore A silicone gasket for lunch box :1. Non-toxic, odorless, transparent, flame retardant ... . Soft, flexible, kink resistance to deformation;3. Not cracking, long life, resistant to high and cold temperature;4. It has a ... superior electrical performance5. Various sizes, colors, durometer could be available silicone gasket for lunch box