This 1L PYREX® EZ Access™ wide mouth volumetric flask has an extra heavy duty glass wall that significantly increases the product durability. The flask is calibrated 'To Contain' (TC) and is 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. Includes a chemically resistant, high temperature polybutylene terephthalate GL32 threaded screw cap with a PTFE liner to provide a secure closure for leak proof solution storage. Flask is lot traceable with Certificate of Compliance available. Reusable. Material: Borosilicate Glass Code 7740. Capacity: 1000mL. Flask Style: Volumetric. Flask Shape: Flat Bottom. Top Style: Threaded. Neck Style: Wide Mouth. Stopper Style: No Stopper. Flask Feature: EZ Access™. Accuracy Class: Class A. Calibration: To Contain. Tolerance: +/- 0.3mL. Cap Style: PTFE Liner. Cap Material: Polybutylene Terephthalate. Thread Finish: 32GL. Height: 315mm. Outer Diameter: 132mm. Corning® #: 5655-1L.