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.
Silicon Dioxide, 325 Mesh, FCC, 90.4%, Spectrum™ Chemical
CAS: 7631-86-9 Molecular Formula: O2Si Molecular Weight (g/mol): 60.08 MDL Number: MFCD00011232 MFCD00217788 MFCD00163736 MFCD00148266 MFCD00603035 MFCD02100519 MFCD06202255 MFCD07370733 InChI Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N IUPAC Name: silanedione SMILES: O=[Si]=O
Colloidal Silicon Dioxide, NF, EP, 99-100.5%, Spectrum™ Chemical
CAS: 7631-86-9 Molecular Formula: O2Si Molecular Weight (g/mol): 60.08 MDL Number: MFCD00011232 MFCD00217788 MFCD00163736 MFCD00148266 MFCD00603035 MFCD02100519 MFCD06202255 MFCD07370733 InChI Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N IUPAC Name: silanedione SMILES: O=[Si]=O
Silicon Dioxide, 325 Mesh, FCC, 90.4%, Spectrum™ Chemical
CAS: 7631-86-9 Molecular Formula: O2Si Molecular Weight (g/mol): 60.08 MDL Number: MFCD00011232 MFCD00217788 MFCD00163736 MFCD00148266 MFCD00603035 MFCD02100519 MFCD06202255 MFCD07370733 InChI Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N IUPAC Name: silanedione SMILES: O=[Si]=O
Silica gel, for column chrom., ultrapure, 60-200 micron, 60A
CAS: 7631-86-9 Molecular Formula: O2Si Molecular Weight (g/mol): 60.08 MDL Number: MFCD00011232 MFCD00217788 MFCD00163736 MFCD00148266 MFCD00603035 MFCD02100519 MFCD06202255 MFCD07370733 InChI Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N Synonym: Silicon dioxide PubChem CID: 24261 ChEBI: CHEBI:30563 SMILES: O=[Si]=O
Silica gel, for drying purposes, non-toxic grade, 3-6 mm
CAS: 7631-86-9 Molecular Formula: O2Si Molecular Weight (g/mol): 60.08 MDL Number: MFCD00011232 MFCD00217788 MFCD00163736 MFCD00148266 MFCD00603035 MFCD02100519 MFCD06202255 MFCD07370733 InChI Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N Synonym: Silicon dioxide PubChem CID: 24261 ChEBI: CHEBI:30563 SMILES: O=[Si]=O
Silica gel, for chromatography, 0.035-0.070 mm, 90 A
CAS: 7631-86-9 Molecular Formula: O2Si Molecular Weight (g/mol): 60.08 MDL Number: MFCD00011232 MFCD00217788 MFCD00163736 MFCD00148266 MFCD00603035 MFCD02100519 MFCD06202255 MFCD07370733 InChI Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N Synonym: Silicon dioxide PubChem CID: 24261 ChEBI: CHEBI:30563 IUPAC Name: dioxosilane SMILES: O=[Si]=O
Silica gel, for chromatography, 0.030-0.200 mm, 60 A
CAS: 7631-86-9 Molecular Formula: O2Si Molecular Weight (g/mol): 60.08 MDL Number: MFCD00011232 MFCD00217788 MFCD00163736 MFCD00148266 MFCD00603035 MFCD02100519 MFCD06202255 MFCD07370733 InChI Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N Synonym: Silicon dioxide PubChem CID: 24261 ChEBI: CHEBI:30563 SMILES: O=[Si]=O
Sigma Organic Chemistry Silicon dioxide, alumina doped | 25ML | | MFCD06202255 | 99.99% trace metals basis
Silicon dioxide, alumina doped, 25ML
About This Item:
MDL Number: MFCD06202255
UNSPSC Code: 12352302
Storage: room temp
Sigma Organic Chemistry Silicon Dioxide (Silica) - Nanofibers Diam. X L ~425nm 50nm x Infinity | 5G | 7631-8-6-9
Silicon Dioxide (Silica) - Nanofibers Diam. X L ~425nm ? 50nm X Infinity, 5G
About This Item:
Unspsc Code: 12352200
Storage: Room Temperature
DELTA ADSORBENTS Blue Indicating Silica Gel Granular 6-16 Mesh | 5lbs
Blue Indicating Silica Gel Granular 6-16 Mesh is the naturally occurring mineral silicon dioxide that has been purified and processed into a hard, smooth beaded form. The beads are then saturated with a moisture indicating solution that gives them a deep blue color when dry. It is also known as a narrow pore silica gel and has a vast network of interconnecting pores with diameters of 20-30Å. These pores have a strong affinity for moisture and use physical adsorption and capillary condensation to trap and hold it. Silica gel will remove moisture at temperatures as high as 220°F, but is best used at room temperature (70-90°F) and high relative humidity (60-90%Rh). The color changes from blue to purple to pink as it adsorbs moisture.
Silicon Dioxide, 325 Mesh, Crystalline, Spectrum™ Chemical
CAS: 14808-60-7 Molecular Formula: O2Si Molecular Weight (g/mol): 60.08 MDL Number: MFCD00011232,MFCD00217788,MFCD00163736,MFCD07370733 InChI Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N IUPAC Name: silanedione SMILES: O=[Si]=O