Description General description Class A, amber, works certified • Complies with ISO 1042 and DIN 12664 • Calibrated to the tolerances required by the United States Pharmacopoeia (USP) which are tighter than those of ISO/DIN standards • Each flask engraved with individual serial number and supplied with certificate of calibration traceable to National standards • Manufactured from borosilicate glass with an amber coating on exterior surfaces to facilitate use with light sensitive solutions • Conformity ‘H’ certified • Polyethylene stopper • White enamel inscriptions Legal Information PYREX is a registered trademark of Corning, Inc.