Pyrex® 1521 series, reagent bottles from SciLabware
General specifications:
Narrow mouth with ground neck and glass stopper. Comply with ISO4796. Pyrex® borosilicate glass conforms to the following standards:
ISO 3585, DIN 12217 - Type 3.3 borosilicate glass
ASTM E-438 Type 1 - Class A borosilicate glass
US Pharmacopoeia - Type 1 borosilicate glass
European Pharmacopoeia - Type 1 glass
Further technical details are available on request.