While PTFE (Teflon) is resistant to many chemicals that would damage borosilicate glass, borosilicate glass is perfectly safe in contact with food. Borosilicat

While PTFE (Teflon) is resistant to many chemicals that would damage borosilicate glass, borosilicate glass is perfectly safe in contact with food. Borosilicate glass is much more resistant to acids (except hydrogen fluoride) than to alkalis, but most foods are acidic or neutral, none are alkaline. Of the materials commonly encountered, the safest for food contact are borosilicate glass, normal glass, commercially-pure titanium and stainless steel.