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:
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.
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
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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.