A:Good elastic, B:small deformation, C:soft,tear resistance, D:ozone resistance, E:ultraviolet,resistance Products DescriptionSilicone ... won't over than 50% at 200 within 48 hours),soft,tear resistance,ozone resistance,ultraviolet resistance,resistance to radiation,abrasion ... the oxygen supplying system; diaphragm; valve. Silicone Sealing Ring for lunch-box