Desiccant cartridges (TL 4440-0007)

TROPACK Packmittel GmbH

Desiccant cartridges (TL 4440-0007) by TROPACK Packmittel GmbH

Desiccant cartridges for precision, electronic and optical equipment

Desiccant cartridges are used in sensitive instrumentation controls and controls in other highly sensitive optical and electronic equipment – particularly military applications – to protect against moisture, corrosion and fungi. The cartridges comply with the German Armed Forcestechnicaldelivery specifications (“Technische Lieferbedingungen”) TL4440-0007 (VG 95239), and have a NATO Stock Number (NSN).

Residual moisture which exists even in environments of extreme impermeability, as well as moisture that enters as a result of a leak, can condense through cooling, causing rusting or fungi, which is in turn particularly harmful to glass, reducing its lifespan. This is where desiccant cartridges come in.

Desiccant cartridges – The desiccant

In accordance with German Armed Forces specification (“Technische Lieferbedingungen”) TL 4440-0007, the desiccant cartridges are filled with a 4Å molecular sieve. The distinguishing feature of molecular sieves as desiccants is their particularly fast adsorption rate at low relative humidity (under 50% RH).

Other types of molecular sieves (3Å, 5Å, 10Å/13X) or silica gel may also be used as desiccants in the various cartridges to suit your specific purpose.

The optimum effect

The following points are important in ensuring optimum cartridge use and effect:

  • The component assemblies must be tightly sealed tight
  • Openings must be sealed, as the drying that occurs inside the equipment creates a drop in pressure, making it easy for new, moist air to potentially enter
  • All parts should be clean and dry, and not contain any residual moisture (N.B.: Plastic parts can have a residual moisture of 3-5%!)

Desiccant cartridges – Casing and protective covercovers

The desiccant cartridges come with a 40% moisture indicator, which enables you to precisely check the relative humidity inside the casing without having to remove the cartridge. Users can thus promptly replace the cartridges before any corrosion occurs.

The cartridge’s black case and transparent window are made from high-tensile plastic (polystyrene), while the cellulose filter facilitates targeted diffusion of water vapour so that the desiccant can adsorb moisture efficiently.
The desiccant cartridges are additionally screwed into special, transparent, VG 95239-compliant protective covers to prevent premature moisture adsorption during delivery and storage.

The desiccant cartridges are additionally delivered in sealed protective packaging to ensure none of their effectiveness is lost during transportation and storage. For optimum shelf life, store the cartridges in their original heat-sealed packaging in a dry place at room temperature.

Shelf life
Standard as per TL 4440-0007:  In an aluminium can: Up to60 months

Optionally in a poly bag (poly bag as per DIN 55473): 12 months

Optionally in an aluminium-composite bag (aluminium composite as per TL 8135-0003): 24 months

Vor dem Polstück 8
Business Type
Export Regions
DIN 55473
ISO 9001:2015
Reinhard Kipke
Marco Nickel
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About TROPACK Packmittel GmbH

Desiccants and packaging materials directly from the manufacturer

As a leading desiccant manufacturer, we offer a wide range of desiccant bags with highly active desiccants, as well as genuine product innovations, for industry and trade. We use the new Activ-Polymer™ technology to unlock innovative and economicapplications, particularly for the pharmaceuticals industry.

TROPACK highly active drying agents bring added value
  •  No transportation damage or storage damage caused by moisture or microorganisms
  • Greater reliability and cost-effectiveness thanks to calculable packaging solutions
  • Complaints minimised
  • Reduction in insurance premiums → no risk exclusions
  • Longer lasting components and machinery during operation
  • Environmentally friendly desiccant disposal


Desiccants and packaging materials

With Tropack as your desiccant manufacturer, you can count on interdisciplinary expertise in desiccants for packaging, systems and transportation. Drawing on our consultancy skills as a long-time industry partner, we’ll find the right solution to suit your needs. German-based production guarantees high, reliable and – of course – certified quality, while our extensive range of desiccant products and large warehousing facilities ensure good availability.