Pyrex® EZ Access™ volumetric flasks have an extra heavy duty glass wall, significantly increasing product durability. These flasks are calibrated "to contain" (TC) and designed to meet Class A, ASTM tolerances for volumetric flasks. The wide funnel-like threaded top plus the wide neck design allows for easy filling and mixing of various materials into solution. This extra wide neck also allows access to larger capacity pipets. For added convenience, one size (GL32) of the chemically resistant, high temperature screw caps fits all flasks. This threaded cap has a PTFE liner to provide a secure closure for leak proof solution storage. For replacement caps, see Cat.No. 1-1395-32HTC; for septum caps and septa, see Cat.Nos. 1-1395-32HTSC, 1-1395-32SS and 1-1395-32TS. Flasks are Lot Traceable with certificates of compliance available in print.