General Recommended RH Level Guide
Note: The enclosed information is not absolute. It is to serve as a general guide line base on information which we have collected over the years. There may be vast different values given by different designers as products keep changing and improving. We advise that qualified engineers & product consultants be engaged before determining the required space condition. We hope that this information will serve our clients better in selection of equipment and space condition design.
| Type of Product | RH | Type of Product | RH |
|---|---|---|---|
| Sugar Storage | 20-35% | Laboratory electronics | 45-60% |
| Breweries | 35-45% | Plastic Pallets | 5-30% |
| Coffee Powder | 30-40% | Computer Peripherals | 50-60% |
| Milk Powder Storage | 20-35% | Rust Resistance | Below 40% |
| Seed Storage | 35-45% | Medical syrups | 30-40% |
| Unpacked Medicine | 20-35% | Capsule storage | 30-45% |
| Anti Fungus | 45-55% | Powder Storage | 30-45% |
| Camera Lenses | 40-45% | Wood Drying | 25-35% |
| HT Switch Room | 45-55% | Explosive | *35-40% |
| Transformer Winding | 15-30% | Hospital Electronics | 45-65% |
| Semiconductors | 30-50% | Normal Storage | 50-55% |
| Archive | 40-55% | Musical Instrument | 45-55% |
| Paper Storage | 35-45% | Leather Product | 40-55% |
| Rust Prevention | Below 55% >40% for zero rust |
Cable wrapping | 15-25% |
| Library | 50-55% | Chemical Lab | 30-45% |
| Spray Paint | 30-50% | Hard disk Production | 40-50% |
| Lithium Battery | Below 2% | Magnetic Tapes | 40-55% |
| Wafer Relatede | 5-10% |
Note: * Explosive storage must not be less than 30% RH as static electricity may build up and cause sparks in the air to cause an explosion. Special DH One way air flow arrangement or total explosion system is needed for such