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250ml bottle mouth ID 42mm/1.65in OD 50mm/1.97in

Borosilicate glass has a very low coefficient of thermal expansion, about one-third that of ordinary glass, high resistance to temperature changes,durability

When oscillating during the titration experiment, it can react fully and the liquid is not easily splashed. It can be heated in a water bath or an electric furnace

The structure is relatively stable and have stronger fracture resistance

Transparent,the scale is very clear,making it easy to observe experimental phenomena