A 240mm Plain Desiccator (China) is a standard laboratory glass container used to create and maintain a moisture-free environment for samples and chemicals. Unlike vacuum versions, the “plain” model relies on a desiccant at the bottom to absorb moisture at ambient pressure.
Key Specifications
- Size (I.D.): 240 mm (approximately 9.4 inches) internal diameter.
- Material: Typically high-quality Borosilicate Glass 3.3, known for its excellent chemical durability and thermal resistance.
- Components:
- Base: Large glass chamber with an internal ledge to hold the plate.
- Lid: Precision-ground glass dome with a knob top.
- Plate: Perforated porcelain plate (sieve plate) used to support samples above the desiccant.
- Sealing: Uses a ground glass flange; applying grease (like vacuum grease) to the flange is recommended to ensure an airtight seal.
Common Applications
- Sample Cooling: Safely cooling heated objects (like crucibles) after removal from an oven or furnace while preventing moisture re-absorption.
- Chemical Storage: Preserving hygroscopic substances (e.g., salts) that react with or degrade in atmospheric humidity.
- Routine Drying: Maintaining a stable, dry environment for sensitive materials without the need for a vacuum pump.
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