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.
Fisher Science Education™ Silica gel 6-12 Mesh, Non-indicating
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 Synonym: Amorphous Silica PubChem CID: 14942 ChEBI: CHEBI:26675 IUPAC Name: silanedione SMILES: O=[Si]=O
WA HAMMOND DRIERITE COMPANY DRIERITE, INDICATING 8 MESH 5 LB JAR, STOCK# 23005
Indicating Drierite is impregnated with cobalt chloride. Indicating Drierite is blue when dry and changes to pink upon absorption of moisture. The color change is pronounced and clearly visible. This makes Indicating Drierite valuable when it is necessary to know with certainty that dryness is being maintained and to signal when the drying agent should be replaced. It has the same efficiency as Regular Drierite, and somewhat greater capacity due to the desiccating effect of the cobalt chloride. It can be regenerated repeatedly for reuse. It should be noted that Indicating Drierite should not be used for the drying of ammonia, NH3, since ammonia reacts with inorganic chlorides. Efficiency: The moisture remaining in gases dried with Drierite at 25° - 30° C is 0.005 mg./liter, (data verified by the National Bureau of Standards). Air is dried to a dew point of -100° F. There is little change in efficiency at temperatures up to 100° C. Typical Analysis: ≥ 98% CaSO4, <2% CoCl2
Fisher Science Education™ Drierite™
CAS: 7778-18-9 Molecular Formula: CaO4S Molecular Weight (g/mol): 136.13 MDL Number: MFCD00010912 InChI Key: OSGAYBCDTDRGGQ-UHFFFAOYSA-L Synonym: Calcium Sulfate PubChem CID: 24497 ChEBI: CHEBI:31346 IUPAC Name: calcium sulfate SMILES: [Ca++].[O-]S([O-])(=O)=O
WA HAMMOND DRIERITE COMPANY DRIERITE, INDICATING 4 MESH 1 LB JAR, STOCK# 21001
Indicating Drierite is impregnated with cobalt chloride. Indicating Drierite is blue when dry and changes to pink upon absorption of moisture. The color change is pronounced and clearly visible. This makes Indicating Drierite valuable when it is necessary to know with certainty that dryness is being maintained and to signal when the drying agent should be replaced. It has the same efficiency as Regular Drierite, and somewhat greater capacity due to the desiccating effect of the cobalt chloride. It can be regenerated repeatedly for reuse. It should be noted that Indicating Drierite should not be used for the drying of ammonia, NH3, since ammonia reacts with inorganic chlorides. Efficiency: The moisture remaining in gases dried with Drierite at 25° - 30° C is 0.005 mg./liter, (data verified by the National Bureau of Standards). Air is dried to a dew point of -100° F. There is little change in efficiency at temperatures up to 100° C. Typical Analysis: ≥ 98% CaSO4, <2% CoCl2
WA HAMMOND DRIERITE COMPANY DRIERITE, INDICATING 10-20 MESH 5 LB JAR, STOCK# 24005
Indicating Drierite is impregnated with cobalt chloride. Indicating Drierite is blue when dry and changes to pink upon absorption of moisture. The color change is pronounced and clearly visible. This makes Indicating Drierite valuable when it is necessary to know with certainty that dryness is being maintained and to signal when the drying agent should be replaced. It has the same efficiency as Regular Drierite, and somewhat greater capacity due to the desiccating effect of the cobalt chloride. It can be regenerated repeatedly for reuse. It should be noted that Indicating Drierite should not be used for the drying of ammonia, NH3, since ammonia reacts with inorganic chlorides. Efficiency: The moisture remaining in gases dried with Drierite at 25° - 30° C is 0.005 mg./liter, (data verified by the National Bureau of Standards). Air is dried to a dew point of -100° F. There is little change in efficiency at temperatures up to 100° C. Typical Analysis: ≥ 98% CaSO4, <2% CoCl2
WA HAMMOND DRIERITE COMPANY DRIERITE, REGULAR (NON-INDICATING) 8 MESH 5 LB JAR, STOCK# 13005
Regular Drierite is anhydrous calcium sulfate. It is of neutral pH, constant in volume, chemically inert except toward water, insoluble in organic liquids and refrigerants, non-disintegrating, non-wetting, non-toxic, non-corrosive, non-channeling, generally recognized as safe (GRAS) by the FDA, not regulated by OSHA, economical to use, and can be regenerated repeatedly for reuse. Efficiency: The moisture remaining in gases dried with Drierite at 25° - 30° C is 0.005 mg./liter, (data verified by the National Bureau of Standards). Air is dried to a dew point of -100° F. Organic liquids are dried to the low ppm range. There is little change in efficiency at temperatures up to 100° C. Typical Analysis: >99.5% CaSO4
WA HAMMOND DRIERITE COMPANY DRIERITE, INDICATING 8 MESH 1 LB JAR, STOCK# 23001
Indicating Drierite is impregnated with cobalt chloride. Indicating Drierite is blue when dry and changes to pink upon absorption of moisture. The color change is pronounced and clearly visible. This makes Indicating Drierite valuable when it is necessary to know with certainty that dryness is being maintained and to signal when the drying agent should be replaced. It has the same efficiency as Regular Drierite, and somewhat greater capacity due to the desiccating effect of the cobalt chloride. It can be regenerated repeatedly for reuse. It should be noted that Indicating Drierite should not be used for the drying of ammonia, NH3, since ammonia reacts with inorganic chlorides. Efficiency: The moisture remaining in gases dried with Drierite at 25° - 30° C is 0.005 mg./liter, (data verified by the National Bureau of Standards). Air is dried to a dew point of -100° F. There is little change in efficiency at temperatures up to 100° C. Typical Analysis: ≥ 98% CaSO4, <2% CoCl2
WA HAMMOND DRIERITE COMPANY DRIERITE, REGULAR (NON-INDICATING) 8 MESH 1 LB JAR, STOCK# 13001
Regular Drierite is anhydrous calcium sulfate. It is of neutral pH, constant in volume, chemically inert except toward water, insoluble in organic liquids and refrigerants, non-disintegrating, non-wetting, non-toxic, non-corrosive, non-channeling, generally recognized as safe (GRAS) by the FDA, not regulated by OSHA, economical to use, and can be regenerated repeatedly for reuse. Efficiency: The moisture remaining in gases dried with Drierite at 25° - 30° C is 0.005 mg./liter, (data verified by the National Bureau of Standards). Air is dried to a dew point of -100° F. Organic liquids are dried to the low ppm range. There is little change in efficiency at temperatures up to 100° C. Typical Analysis: >99.5% CaSO4
WA HAMMOND DRIERITE COMPANY DRIERITE, INDICATING 4 MESH 5 LB JAR, STOCK# 21005
Indicating Drierite is impregnated with cobalt chloride. Indicating Drierite is blue when dry and changes to pink upon absorption of moisture. The color change is pronounced and clearly visible. This makes Indicating Drierite valuable when it is necessary to know with certainty that dryness is being maintained and to signal when the drying agent should be replaced. It has the same efficiency as Regular Drierite, and somewhat greater capacity due to the desiccating effect of the cobalt chloride. It can be regenerated repeatedly for reuse. It should be noted that Indicating Drierite should not be used for the drying of ammonia, NH3, since ammonia reacts with inorganic chlorides. Efficiency: The moisture remaining in gases dried with Drierite at 25° - 30° C is 0.005 mg./liter, (data verified by the National Bureau of Standards). Air is dried to a dew point of -100° F. There is little change in efficiency at temperatures up to 100° C. Typical Analysis: ≥ 98% CaSO4, <2% CoCl2
WA HAMMOND DRIERITE COMPANY DRIERITE, LABORATORY GAS DRYING UNIT WITH HOSE BARBS, STOCK# 26800
The Drierite Laboratory Air and Gas Drying unit is an all-purpose drier. This unit is suitable for most laboratory applications. It will dry air to a dew point of -100° F at atmospheric pressure or pressures up to 100 psig. A simple connection to the bottom inlet of the dryer provides an immediate flow of dry air or gas. This unit is also available with 1/8 inch SS Female NPT fittings (Stock No. 26840) or 1/8 inch SS Male Tube Fittings (Stock# 27070). Note: Do not use this plastic column in the presence of vapors or liquids containing phosphate esters, synthetic lubricants, hydrocarbon solvents, methanol, acetone, lacquer solvents, or other organics.
Cole-Parmer Drierite 23001 Indicating desiccant; twelve 1-lb packs/carton
Use Drierite desiccants -- anhydrous calcium sulfate in desiccators, drying columns or drying tubes. Choose indicating or non-indicating desiccant indicating desiccant starts blue, then turns pink when regeneration or renewal is necessary.
WA HAMMOND DRIERITE COMPANY DRIERITE, REGULAR (NON-INDICATING) 10-20 MESH 5 LB JAR, STOCK# 14005
Regular Drierite is anhydrous calcium sulfate. It is of neutral pH, constant in volume, chemically inert except toward water, insoluble in organic liquids and refrigerants, non-disintegrating, non-wetting, non-toxic, non-corrosive, non-channeling, generally recognized as safe (GRAS) by the FDA, not regulated by OSHA, economical to use, and can be regenerated repeatedly for reuse. Efficiency: The moisture remaining in gases dried with Drierite at 25° - 30° C is 0.005 mg./liter, (data verified by the National Bureau of Standards). Air is dried to a dew point of -100° F. Organic liquids are dried to the low ppm range. There is little change in efficiency at temperatures up to 100° C. Typical Analysis: >99.5% CaSO4
WA HAMMOND DRIERITE COMPANY DRIERITE, INDICATING 10-20 MESH 1 LB JAR, STOCK# 24001
Indicating Drierite is impregnated with cobalt chloride. Indicating Drierite is blue when dry and changes to pink upon absorption of moisture. The color change is pronounced and clearly visible. This makes Indicating Drierite valuable when it is necessary to know with certainty that dryness is being maintained and to signal when the drying agent should be replaced. It has the same efficiency as Regular Drierite, and somewhat greater capacity due to the desiccating effect of the cobalt chloride. It can be regenerated repeatedly for reuse. It should be noted that Indicating Drierite should not be used for the drying of ammonia, NH3, since ammonia reacts with inorganic chlorides. Efficiency: The moisture remaining in gases dried with Drierite at 25° - 30° C is 0.005 mg./liter, (data verified by the National Bureau of Standards). Air is dried to a dew point of -100° F. There is little change in efficiency at temperatures up to 100° C. Typical Analysis: ≥ 98% CaSO4, <2% CoCl2