Flasks, Volumetric C-11627 Translucent, Polypropylene with leak proof threaded cap. These flasks can be autoclaved and have good chemical and impact resistance. Flasks, Volumetric, Class A C-11630 Boro 33 Glass with interchangeable P.P. stopper, accuracy as per ISO-1042. Flasks, Volumetric, Class B C-11635 Boro 33 Glass with interchangeable P.P. stopper, Accuracy as per ISO-1042. NOTE : Above Volumetric flasks can be supplied in all capacities, with glassPP stoppers, in Amber color and with works certificate of accuracy for Class A.