ThoMar Desiccants Calculator

  • Packed space / Barrier layer
  • Climate at packaging
  • Goods
  • Packaging aids
  • Climate during storage / transport
  • Results

Barrier layer

Desiccants protect your goods by reducing air humidity. Thus, a barrier layer is needed to limit air exchange. Timber and carton limit the air exchange insufficiently. They are incalculable and thus unsuitable as a barrier layer. In contrast, barrier foils are commonly used around the packaged goods. When using shipping containers, the container itself can constitute the barrier layer.

It is assumed that a container cannot be completely air tight. There is a slight air exchange through crevices, gaps and the opening of doors. Larger air vents should be sealed by means of adhesive tape.
A PE foil should have a thickness of 0.2 mm (200 my). The thicker the foil, the less water vapour can diffuse through the foil. The calculation here is based on a foil thickness of 0.2 mm.
Loading space refers to the volume of any enclosed space to be packed.
Compound aluminium foil has got a much higher density than PE foil and is thus suitable especially for longer storage periods.
Loading space refers to the volume of any enclosed space to be packed.

Maximum climate at packaging

We recommend choosing the highest credible climate for optimal protection of your goods from moisture.
max. 24 °C and 90 % relative humidity

Goods to be protected: Moisture content

The goods to be protected may also contain moisture which can be transferred to ambient air. Under temperature fluctuations, moisture condenses on the surface of the goods and can cause damage. It should thus be established, whether the goods contain and transfer moisture.

Choose the characteristics of the goods to be protected

The goods contain no water (e.g. metal).
Air dry normally has a water content of max. 18%. A maximum of 8 % of this 18 % can evaporate so there is residua moisture of 10 % in the material. This is the usual value of dry packaging aids stored in buildings
For an accurate analysis, a moisture meter can be used. Alternatively, if possible, weigh a sample, dry it in an oven at 60 °C and weigh again. The difference in weight equals the moisture content. The calculation takes place according to the following formula:

Packaging aids: What, apart from the goods, is contained within the barrier layer?

Packings aids can increase the stability of the packaging material (e.g. pallets, padding and safety materials).

Air dry normally has a water content of max. 18%. A maximum of 8 % of this 18 % can evaporate so there is residua moisture of 10 % in the material. This is the usual value of dry packaging aids stored in buildings
For an accurate analysis, a moisture meter can be used. Alternatively, if possible, weigh a sample, dry it in an oven at 60 °C and weigh again. The difference in weight equals the moisture content. The calculation takes place according to the following formula:

Air dry normally has a water content of max. 18%. A maximum of 8 % of this 18 % can evaporate so there is residua moisture of 10 % in the material. This is the usual value of dry packaging aids stored in buildings
For an accurate analysis, a moisture meter can be used. Alternatively, if possible, weigh a sample, dry it in an oven at 60 °C and weigh again. The difference in weight equals the moisture content. The calculation takes place according to the following formula:

Air dry normally has a water content of max. 18%. A maximum of 8 % of this 18 % can evaporate so there is residua moisture of 10 % in the material. This is the usual value of dry packaging aids stored in buildings
For an accurate analysis, a moisture meter can be used. Alternatively, if possible, weigh a sample, dry it in an oven at 60 °C and weigh again. The difference in weight equals the moisture content. The calculation takes place according to the following formula:

Packaging aids may contain too much moisture, thus damaging the goods that should actually be protected. Hence, it is important to use only dry packaging aids.

Climate during storage / transport

These information are approximately necessary to calculate the air exchange over the time through the barrier layer.

Desired target moisture

Hint: Calculation according to DIN commonly uses a target moisture of 40%.

Results

Calculated desiccant need: desiccant units
(Based on your information, formula according to DIN 55474 and amendments through rule of thumb.)

Suitable products

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