... :PP,resist temperature up to 100'c available to sterilizationScrew cap:PP ,resist temperature up to 100'c available to sterilizationBottle ... : made of food-grade POLYCARBONATE one-time injection blow moulding bottle is transparent, light weight, smooth inside, easy to wash,tear ... venthole in the bottom the presure inside and outside the bottle.More healthy, safer,no-toxic and odorless, heat-resistant, ...