Typical Dry Air Application Standards
The applications below represent a very small percentage of the needs and uses for dry air; the conditions cited are typical of past uses. Specific needs change, as do technology and manufacturing processes.
Your Bry-Air representative can determine appropriate values for a particular application.
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Typical Application Standards |
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Application |
Typical Conditions |
Notes |
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Temp °F |
Humidity |
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Aerosols |
80 |
2 gr/lb dry air |
Use hood over Freon charging nozzle and purge hood with very dry air |
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Brewing and Distilling Hops Storage Fermentation Rooms Filter Rooms Grain Storage |
35 60 |
60%RH 45%RH 45%RH 40%RH |
To reduce mold growth on walls To reduce mold growth on walls |
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Baking Sugar Storage Icing and Glazing Cookie Drying Filled Cookie Setting Potato Chips |
80 80 65 20-30 75-80 |
35%RH 35%RH 20%RH 20%RH |
Dry Air to minimize defrost requirement |
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Candy Caramel Cooling Bar Cooling Chocolate Hard Candy Making Hard Candy Packing Sugar Storage |
60 0 90 75 75 80 |
40%RH 40%-50%RH 13%RH 35%RH 35%RH 35%RH |
Care should be exercised in the systems design to insure against recirculating air-borne sugar dust in the system |
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Concentrates Molasses Grinding Honey Grinding Instant Coffee Packing Citrus Crystal Packing |
80 80 |
Less than 25%RH Less than 25%RH 20%RH 15%RH |
Do not recirculate – Pre-cool and dry to 20-25 gr/lb |
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Ferrous Cupola Dry Blast |
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40 gr/lb dry air |
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Crystal Growing |
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Varies |
Dependent on particular salt |
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Crystal Cutting |
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Varies |
Dependent on particular salt |
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Coils-Electronic |
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Lowest possible 1-3 gr/lb dry air |
Prevent moisture absorption by insulation |
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Coils – TV and X-Ray |
72 |
15%RH |
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Transformer Manufacturing and Rebuilding |
80 |
5%RH |
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Elec. Appliances |
72 |
15% |
In blankets and pads with Nylon sheathing or insulation, moisture causes shorting and change in electrical characteristics and moisture absorbed in sealed sheath heating elements can cause failure and even explosion |
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Lightning Arrestor (Assembly) |
60 |
20%RH |
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Typical Application Standards |
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Application |
Typical Conditions |
Notes |
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Temp °F |
Humidity |
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Switch Gear Assembly |
68 |
20-24%RH |
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Lamination |
80 |
20%RH max |
Paper, cloth or wood, glass fibers, etc. bonded with plastic, shellac, varnish or glue. Store material at 20%rh to insure good bond. Store finished goods at less than 80° F at 20%RH to prevent adhesion. |
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Chinchilla Raising |
32-35 |
18-25%RH |
High humidity is a health hazard. Low temperature and humidity provide denser and better pelts. |
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Matches |
70 |
40%RH |
For drying |
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Paper Coating |
80 |
20%RH |
For paper storage prior to coating with wax, plastic, adhesive, etc. To insure bond (See lamination) (Limit paper to 4% moisture) |
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Paint Spraying and Lacquering |
80 |
50%RH or less |
Control spray booth or cabinet to prevent blushing caused by moisture condensing on evaporative cooled surface (evaporation of paint or lacquer solvent) Do not recirculate. |
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Paper & Fiber Molding |
80 |
20%RH |
Finished-good storage to prevent sticky condition and loss of shape |
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Printing & Binding |
90 |
30%RH |
Paper storage to prevent excessive moisture content (4-6% maximum) and resultant high static electric charge. Changes in moisture content between impressions causes poor register. |
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Pharmaceuticals Ampoule Mfg. Penicillin Packaging Capsule Storage Colloids Cough Syrups Cough Drops Effervescent |
80 80 75 70 80 70 90 |
30%RH 5-15%RH 35-40%RH 35%RH 40%RH 30%RH 15%RH |
Hygroscopic Product Gelatin softens and distorts at higher temperature and humidity Similar to hard candy Powders or tablets |
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Extracts – Glandular Liver |
70-80 70-80 |
5-10%RH 5-10%RH |
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Tablet Coating |
80 |
5-30%RH |
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Tablet Compressing |
70-80 |
10-30%RH |
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Powder Storage |
70-80 |
15-30%RH |
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Powder Mfgr |
70-80 |
15-30%RH |
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Powder Milling |
80 |
35%RH |
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Plastics, Nylon, etc. |
3-15%RH |
35%RH |
For drying and storage prior to molding |
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Plastics, Manufacturing Area for Thermo Setting and Moulding Compounds |
80 |
25-30%RH |
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TV-Radio Broadcasting |
70 |
20%RH |
Tape head life extension |
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Typical Application Standards |
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Application |
Typical Conditions |
Notes |
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Temp °F |
Humidity |
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Plastics, Laminated Built-up areas Parchment storage |
70 70 |
20%RH 35%RH |
High efficiency filters required to eliminate dust and fumes |
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Plywood |
90 |
15-25%RH |
Cold pressing |
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Rubber Products |
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Dipped Goods |
75-90 |
25-30%RH |
Dew point of air must be below evaporation temperature of solvent |
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Cementing |
80 |
25-30%RH |
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Tire Cord |
125 |
7%RH |
For storage to prevent moisture absorption & resulting loss in adhesion with rubber |
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Glass Laminating |
68-70 |
15-20%RH |
To insure good long life bond |
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Explosives Gun Powder, Solid Fuels |
35-75 |
10-50%RH |
Range is great dependent on material, but storage is critical – e.g. – solid fuel power is calculated with consideration of time stored at given condition |
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Freezer Tunnel Vestibules |
75 |
10-20%RH |
Introduce air as curtain in front of tunnel opening |
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Pipe Galleries |
40-80 |
40-50%RH |
Maintain space dew point below piped fluid temperature to eliminate condensation. Maintain temperature to eliminate corrosion. |
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Telephone & Electrical Cable Wrapping |
80 |
5 – 20%RH |
Extra high voltage cable wrapping has no lower limit on moisture. Upper limit is about 5%RH. |
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Seed Drying & Storage |
35-80 |
10-25%RH |
Low temperature drying and low RH storage preserves germination potential |
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Food Drying Bins |
95-105 |
2 gr/lb dry air |
Spices – condiments |
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Transformer (Electric) |
90 |
10-25%RH |
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Transistors |
72-75 |
25-40%RH |
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Tubes – Radio |
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TV – Lighting |
90 |
15-25%RH |
Drying inside coating – There is no minimum moisture level – The dryer the air – the better |
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Missiles |
35 80 |
35%RH 25%RH |
Purging and cooling Assembly |
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Fertilizer Storage |
AMB |
40-50RH |
Deliver air, 1-1/2 air changes/hour at 25%RH when corrected to ambient dry bulb. |
The above applications represent a very small percentage of the needs and uses for dry air; the conditions cited are typical of past uses. Specific needs change, as do technology and manufacturing processes.
Bry-Air can help you determine appropriate values for a particular application.