USP Type-Pharmaceutical glass containers can be classified as USP Type I, II, III
Type I-Borosilicate glass represents the least reactive glass.
Type I glass has the least pH shift. (Lowest leaching characteristics)
Coefficient of Expansion = 33 or 50 or 70
Type II - is de-alkalized soda lime glass with higher levels of sodium hydroxide and calcium oxide.
Type III - soda lime glass - cannot be autoclaved.
Coefficient of Expansion = 90