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 Desiccant bags TROPACK Packmittel GmbH

Desiccant bags

Damage caused by corrosion or humidity are likely to occur during transportation or storage of industrial products such as:

  • Machine tools
  • Data processing plants
  • Optical and precision instruments
  • Electronic equipment
  • Pharmaceuticals
  • Chemicals
  • Military components
  • Leather goods
  • Food

Desiccant bags, filled with highly active drying agents, offer the ideal solution for the protection of moisture-sensitive goods in an effective and environmentally friendly way.

The filling of the desiccant bags is measured in units. One desiccant unit is equal to the amount of a drying agent capable of adsorbing a minimum of 3g at 20% relative humidity and 6g at 40% relative humidity of water vapour at an air temperature of 23°C (±2).

The DIN 55473 only allows for the description in desiccant units. The following table offers an overview of the approximate amount of desiccant in each bag.

Units 1/6 1/3 1/2 1 2 4 8 16 32
= approximately g Filling weight 6 12 18 35 70 145 285 540 1130

Version A – DIN 55473
low dust leakage = regular bag

Version B – DIN 55473
dust-free = for highly sensitive products

TROPAgel® are manufactured with highly efficient drying agents allowing for a high adsorption and drying rate thanks to their superior porous properties. The adsorption capacity may be as high as 30% of its weight at 80% RH and 25°C. TROPAgel® desiccant bags are chemically inert and nontoxic for metal or any other materials.

TROPAgel® corrosion protection is further required during the transportation of industrial steel and iron products, as well as for copper and aluminium goods which are usually transported in a hermetically sealed environment, where the formation of condensation water will have a corrosive effect on the transported goods. The formation of such condensation water may be triggered by a sharp fall in temperature..

The attached table allows for an easy calculation of the required amount of drying agent and thus the corresponding amount of desiccant units. Further factors need to be observed in order to guarantee true desiccant protection since the drying agent, according to DIN 55473, has only a limited humidity adsorption capacity.

We have therefore developed a simple method to calculate the amount of desiccants required for the respective purpose. The information is available on disc which can be purchased through our company.

  • Type of packaging
  • Amount of water vapour penetrating through the packaging from the outside
  • Length of transportation and storage period at the addressee
  • Climate conditions during the transportation and at the recipient’s end
  • Level of humidity inside the packaging
  • Amount of padding material used (wood, paper, synthetic fillers, cardboard, wooden parts, etc.)



The desiccant bags are used in combination with barrier foils. Each foil type is equipped with a specific rate of water vapour permeability. When calculating the amount of drying agents needed, the degree of humidity continuously penetrating the packaging therefore needs to be taken into account. Please also refer to DIN 55474. Please make sure to adhere to the items listed below:

  • More than one temperature zone during transportation
  • Total length of transportation
  • Storage time
  • Degree of water vapour permeability of the foil
  • Packaging surface measured in m²
    (all 6 sides)

There needs to be a constant humidity level of below 50% inside the packaging in order to truly prevent corrosive damage.

There are two types of barrier foils:

Polyethylene Barrier Foil
For transportation and storage periods with a maximum term of 1 year.

Aluminium Barrier Foil TL 8135-0003
For transportation and storage periods between 1 and up to 5 years.

When using standardized packaging with polyethylene barrier foil it is important to use a foil with a total thickness of 200 microns and a maximum water vapour permeability rate of 0.5 g/m² in 24 hours and 23°C/ 85% RH (please also refer to DIN 55122).

All packaged goods with storage over extended periods of time need to be sealed and shrink-wrapped with an aluminium barrier foil, i.e. Tropac®. For further information, please refer to the chapter “multilayer barrier foils”.

All calculations based on goods in packing boxes can also be applied to small items packed into the respective laminated barrier foil bags.

In the table, both sides of the surface are illustrated in square meters.

All packaging needs to be free from any leaks and damages or split seams.


Tin Barrel
This type of packaging effectively prevents the penetration of humidity due to its water vapour resistant properties. The air, initially included inside the packaging, therefore needs to be dehumidified.

Please observe the temperatures on the interior of the packing area. The requirement is 1 unit of drying agent per 200 l of head space inside the packaging in reference to the empty packaging drum.


VA Type A
Low-dust bag made of tear-proof fleece material. Minimum order of 8 units. Hanging loops included. Area of application: All overseas packaging.


Low-dust bag as Type VA,
with additional ESD-coating available.


ESD Certificate Download ESD Certificate

PA Type B
Dust-free soda-paper bags for regular use.

TA Type B
Dust-free tyvek bag made of a special tear-proof protective fabric with a low particle count. Area of application: Pharmaceutical industry, electronics and any packaging with elevated exposure levels. This item meets the FDArequirements (DMF 1893).

Types PA 1/6-4 units
Types VA 1/6-32 units
Types VA 1/6-16 units

These types are in line with the DIN 55473 in the 02/2001 version and are provided with the DIN Certco sign 5B003.

All products can be equipped with a humidity indicator card as an additional feature. In that case, a “W” will be added to the product labelling (example: VAW).

Please contact us for custom-made desiccant bags which we will manufacture according to your request and requirements. We offer special sized bags with an imprint according to your own design.

We would be happy to assist you with your product needs.



Download certificate
(4 MB)


The basic packaging consists of a polyethylene bag in with DIN 55473 and applies for all bag types which are divided as follows:

Units 1/6 1/3 1/2 1 2 4 8 16 32
1 Basic Pack
150 80 60 40 20 15 10 5 3

Inside this basic packaging, the desiccant bags may be stored in dry areas for extended periods of time without losing any of their dehumidifying capacity. Each of the basic packaging is imprinted with an instruction manual and contains a humidity level indicator 8% RH. If the colour of the indicator is blue, the desiccant is still active. Please refer to the text on the tally sheet when the indicator has turned pink.

The items are shipped inside a corrugated cardboard box which holds up to 30 kg with a net weight of up to approx. 20 kg. The box includes the following total quantities:

Units 1/6 1/3 1/2 1 2 4 8 16 32
1 Original cardboard box contains: 1.350 800 720 400 240 120 60 30 18

More information:


TROPAgel® desiccant bags with highly effective drying agents guarantee the safe transportation of your products coupled with a cost advantage through:

  • Reduction of transportation time and simple packaging
  • Increase in customer satisfaction
  • Lower insurance premiums / no risk exclusions
  • No transportation or storage damage
  • Environmentally-friendly disposal of the drying agent
    (domestic waste).

The information rendered in this brochure is just a short overview and is noncommittal. We kindly ask you to refer to the local conditions and the materials applied when using the desiccant bags.

Please do not hesitate to contact us for any further inquiries you may have and we would be happy to personally assist you with all your packaging requirements.

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