Lab Desiccants and Drying Agents
Hygroscopic substances and drying agents for use in laboratory settings; drying agents are commonly used to keep other substances and samples dry, or to prevent moisture from forming on/in containers. Products include drying tubes, kits, etc.
Desiccants are typically chemicals or compounds that are hydroscopic (readily absorb moisture). Common desiccants include clays, silica gels, and calcium sulfate.
In the lab, desiccants are commonly used in desiccators and desiccator cabinets, with in-line air and gas drying columns, in absorption bulbs, U-tubes, glove boxes, sealed chambers, and wherever a dry environment is required. They are also used during transport, for storage, and maintaining materials and products ─ everything from clothing to electronics.
The moisture may come from a variety of sources:
- Water vapor in the air
- Moisture in packaging materials
- Moisture from permeation or leakage
Some desiccants contain an indicator or additive that produces a color change with moisture absorption. The indicator allows the user to see when the desiccant has absorbed its maximum amount of moisture and needs to be replaced or regenerated.
Some desiccants can be reused many times simply by heating them in an oven to allow moisture to evaporate. For indicating desiccants, one can also easily tell when the desiccant is again ready to use by the change back to the original color.
Desiccants may be available in a range of mesh or particle sizes. The Tyler Equivalent is a common type of mesh sizing and indicates the number of openings per linear inch of mesh. Common desiccant mesh sizes are 4, 8, and 10 to 12. Size 4 is typically used in gas phase applications; they are larger and less likely to break. Size 8 is smaller and can be more tightly packed.
Silica gel, preparative chromatography grade, spherical, 15 micron APS, 100 angstroms, 99.99+%, Thermo Scientific™
CAS: 63231-67-4 Molecular Formula: H2O3Si Molecular Weight (g/mol): 78.098 MDL Number: MFCD00011232 InChI Key: IJKVHSBPTUYDLN-UHFFFAOYSA-N PubChem CID: 14768 IUPAC Name: dihydroxy(oxo)silane SMILES: O[Si](=O)O
Avantor Silica Gel SilicAR, Macron Fine Chemicals™
CAS: 1343-98-2 Molecular Formula: O2Si Molecular Weight (g/mol): 60.08 MDL Number: MFCD00011232 MFCD00217788 MFCD00148266 MFCD00603035 MFCD02100519 MFCD06202255 MFCD07370733 InChI Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N PubChem CID: 14942 ChEBI: CHEBI:26675 IUPAC Name: silanedione SMILES: O=[Si]=O
AquaPhoenix Scientific Cornstarch
Component of Geologic Journeys kit
Andwin Scientific DRIERITE INDICATOR 4 MESH 1LB
The Indicating DRIERITE Absorbent is an effective drying agent that conveniently provides visual indication of the progress of absorption and exhaustion. This product can be utilized at the end of large units of regular DRIERITE to signify the activity or exhaustion of regular DRIERITE. This can absorb 6-10% of its weight in water, contingent on relative humidity. As this product absorbs moisture, the indicator's color will change from blue to rose-red. This has a mesh size of 4 and a weight of 0.45 kg (1 lb).
