PYREX®, borosilicate glass, amber, with PE stopper.

• Calibrated to the tolerances required by the United States Pharmacopeia (USP), which are tighter than those of ISO/DIN standards
• Each flask is laser etched with a unique individual serial number, batch code and date of manufacture - Batch certificates are downloadable from website: www.scilabware.com
• White enamel inscriptions, ideal for use with light sensitive solutions