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What are the effects of OBRA desiccant bags?
OBRA desiccant bags protect packed products from corrosion during transport and storage, from mould growth and other damages due to moisture. The application is determined in DIN 55 474.
What can be protected by OBRA desiccant bags?
All metals and materials subject to corrosion and mildew, such as electronic and optical components, chemical and pharmaceutical products, surgical and dental equipment, ammunition and military items, textile fabric, leather, food, machinery, engines and other items of critical nature requiring protection from the damaging effects of water vapour.
How to use OBRA desiccant bags
DIN 55 474/TL 8100-04 gives advice on the application of desiccants in bags.
OBRA desiccant bags should be fixed at strategic points inside the water vapour proof barrier material (aluminium foil wrapping/polyethylene film). The use of OBRA desiccant bags with an adequate water vapour proof barrier, ensures the best protection for any intake of water vapour into the package or retained, as residual moisture is adsorbed by the desiccant, creating a safe atmosphere within the package.
The area (square metre) of the barrier foil should be kept to a minimum, to keep the amount of water vapour penetration at a low rate.
Desiccant will be purchased on the basis of adsorption capacity. A desiccant unit is that quantity of desiccant, as received which will adsorb at equilibrium with air at 23 ± 2 °C at least the following quantities of water vapour:
6,0 grams at 40 pct. relative humidity
A formulae given in DIN 55 474 explains the calculation of the required number of desiccant units per package.
We have shortened this formulae to simplify the calculation. The following numbers of desiccant units are needed per square meter of the barrier material:
For transport/storage into/through:
- temperate climates = 6 desiccant units
- mediterrian climates = 10 desiccant units
- tropical climates = 20 desiccant units
Per kilogramm of moisture containing dunnage (timber, cartons board etc.) inside the barrier additional 20 desiccant units are required.
Advantages of OBRA desiccant bags in comparison with other means of prevention of corrosion:
- no depreservation
- easy handling
- unlimited application for all kinds of material
- not sensitive to environment
How do OBRA desiccant bags work?
OBRA desiccant bags contain chemically inert, odourless, non-polluting granules, which prevent corrosion and mildew by adsorbing the moisture from the air of an enclosed space.
What sizes and types of OBRA desiccant bags are available?
- Bags of kraft paper;
Fillings: 1/6, 1/3, 1/2, 1 and 2 desiccant units,
- Bags of tearproof non-woven fabric (regenerative);
Fillings: 1, 2, 4, 8, 16 and 32 desiccant units,
- Bags of TYVEK ®, dustproof;
Fillings: 1, 2, 4 and 8 desiccant units,
- Bags of tissue paper;
Fillings: 0.5 g - 50 g.
- Special sizes and filling weights on request.
SIOGEL® (highly active silica gel with or without humidity indicator) and/or desiccant clay are prevailingly used as filling material for OBRA desiccant bags.
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Reg.-Nr.: 5B005 |
From 4 desiccant units and up the OBRA desiccant bags can be supplied with a fixing option on request.
The quality of OBRA desiccant bags, according to DIN 55 473, is constantly being inspected by DIN CERTCO.
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More information:
Product data sheet
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