USP(United States Pharmacopeia) 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(High borosilicate glass) or 50(Neutral Borosilicate glass) or 70(Low borosilicate glass).
Type II - is de-alkalized soda-lime glass with higher levels of sodium hydroxide and calcium oxide.
Coefficient of Expansion = 90
For Appearance, with foggy effect, which can be disappeared when meeting with water.
Type III - soda-lime glass - cannot be autoclaved.
Coefficient of Expansion = 90
