A 40 x 90 mm Pyrex weighing bottle is a specialized piece of laboratory glassware used for precisely weighing hygroscopic (moisture-absorbing) samples or volatile substances.

The dimensions 40 x 90 mm typically refer to the diameter and height of the bottle, respectively.

Key Specifications & Features

• Material: Borosilicate glass (Pyrex). This provides high thermal shock resistance and excellent chemical durability, ensuring the glass doesn’t react with the sample.

• Joint Type: Most weighing bottles of this size feature a ground-glass joint with an interchangeable, low-form stopper. This creates an airtight seal to prevent the sample from gaining or losing moisture during the weighing process.

• Design: The tall-form design (90 mm height) is ideal for samples that require more vertical space or for preventing “dusting” of fine powders when opening the container.