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 Desiccant cartridges and capsules TROPACK Packmittel GmbH

Desiccant cartridges and capsules

Desiccant cartridges and capsules are required in order to effectively protect high-end equipment used for measuring and controlling optical and electronic devices against corrosion or moisture damage. The equipment needs to be protected against the penetration of dust and moisture and therefore perfectly sealed packaging is vital for the useful life of these products. The remaining moisture inside the equipment and the humidity penetrating through leaks in the packaging may condense by ambient temperature cooling and result in the formation of rust or mildew (glass). Deteriorated equipment becomes useless and involves serious consequential costs.

It is recommended to use the desiccant cartridges inside the delicate equipment of measurement and control technology and other highly sensitive optical and electronic devices such as military equipment. The desiccant cartridges effectively protect the goods against moisture, corrosion and fungal contamination. Desiccant capsules are furthermore a very good protection for all pharmaceuticals due to their various sizes and shapes. They can be filled with a variety of drying agents.

The desiccant capsules and cartridges are predominantly made from modern synthetic materials such as acrylonitrile copolymers. The cover is made of paper or other non-woven materials to achieve a diffusion of air humidity. The products are party equipped with moisture indicators.

Depending upon the application, the customer may request the appropriate drying agent, which is predominantly silica gel (Silicon dioxide – SiO2) or molecular sieves.

The round zeolite crystals have an adsorptive capability of approx. 20% weight percentage subject to the relative humidity. The product regenerates at 400 °C. Molecular sieves have an especially high adsorption rate and are virtually dust free.

Please adhere to the following guidelines for optimal application and results: All components need to be hermetically closed, gaps need to be sealed. This is important because the drying process on the equipment interior leads to a slight pressure drop which may easily result in the intake of new humid air. All parts should be clean and dry and free from any residual moisture. Please note that plastic parts may contain
a 3–5% level of residual moisture.

Both desiccant cartridges and capsules are filled with active drying agent during the production process. In order for the drying agents to maintain their performance level during transport and storage, the product is delivered in hermetically sealed protective packaging. The standard form of packaging is a 0.2 mm polyethylene pouch further containing a humidity indicator. Another option is the use of water vapour resistant laminated aluminium foils in line with TL 8135-0003. The bags are non-transparent and the humidity indicators on the inside may only be inspected with the bag open. There is an option to select from transparent laminated foil bags possessing a very high water vapour resistance in compliance with MIL-B22191, type I.

The desiccant cartridges are additionally equipped with a protective sleeve according to VG-95239. One protective sleeve, made of transparent polystyrol, is screwed onto each desiccant cartridge. They may additionally be placed in an aluminium box (please refer to TL 4440-0007). We can only guarantee the proper condition and performance of the capsules and cartridges when all packaging remains intact and unopened during transportation. We would like to point out that all information with regard to military standards are based on their effective versions at the time this brochure was printed.

Tropack is developing and offering a wide selection of desiccant cartridges and capsules in various designs.


Item no.
NATO Stock no
Description Dimensions
Installation length in mm
    Desiccant cartridges for fine-mechanical and optical devices according to VG 95 239 of black polystyrole with sight window and moisture indicator for 40 % rh in the head part of the desiccant cartridge Einbaulänge
1 4440-12-158-5262 Rated size 2,5 - 15 (transparent);
Gew.: M16 x 1,5; Filling: 0,35 molecular screene
2 4440-12-158-5263 Rated size 5 - 25 (transparent);
Gew.: M16 x 1,5; Filling: 0,7 molecular screene
3 4440-12-158-5264 Rated size 10 - 50 (transparent);
Gew.: M16 x 1,5; Filling: 1,5 molecular screene
4 4440-12-175-4087 Rated size 10 - 17 (transparent);
Gew.: M24 x 1,5; Filling: 1,7 molecular screene
5 4440-12-175-4086 Rated size 25 - 16 (transparent);
Gew.: M36 x 1,5; Filling: 3,5 molecular screene
6 4440-12-158-5265 Rated size 25 - 35 (transparent);
Gew.: M24 x 1,5; Filling: 3,5 molecular screene
7 4440-12-158-5429 Rated size 50 - 70 (transparent);
Gew.: M24 x 1,5; Filling: 7molecular screene
8 4440-12-154-7226 Rated size 100 - 45 (transparent);
Gew.: M36 x 1,5; Filling: 14 molecular screene
    Desiccant plastic capsules (cylindrical container) with porous cover disc of cardboard, cannot be regenerated  
9 HKS000001 Desiccant capsule KA 0,4
Filling: 0,5g white gel
Ø 12,7
Height 9
10 HKS000101 Desiccant capsule KA 1,25
Filling: 1,25g white gel
Ø 20
Height 10
11 HKS000003 Desiccant capsule KA 3
Filling: 3g white gel
Ø 29
Height 10
12 HKS000301 Desiccant capsule KO 0,65
Filling: 0,65g orange gel
Ø 15
Height 10
13 HKS000300 Desiccant capsule KO 3
Filling: 3g orange gel
Ø 29
Height 10
14 HKS000302 Desiccant capsule KO 4
Filling: 4g orange gel
Ø 31
Height 12
15 HKS000031 Desiccant capsule KO 27
Filling: 27g orange gel
Ø 61,5
Height 20
16 HKS000401 Desiccant capsule KM 1
Filling: 1 molecular screen
Ø 13,9
Height 17,3
17 4440-12-140-2234 Desiccant capsule transparent
Filling: 5g orange gel; 2 pcs. per packaging
Ø 36
Height 8,2
18 4440-12-140-2254 Desiccant capsule transparent
Filling: 5g white gel; 2 pcs. per packaging
Ø 36
Height 8,2
Rated size z.B. 100 bezeichnet das Leervolumen eines Gerätes mit max. 100dm3. Die Trockenpatronen TL 4440-0007 werden in die Schutzhülsen dicht eingeschraubt. Patronenkopf und Hülse sind mit rotem Klebeband gesichert. Die Gewichte verstehen sich bei einer Toleranz von +/- 10 %.

The fill weight of the desiccant cartridges and capsules may vary due to the different bulk density levels of the drying agent.

Please request your own specific requirements with regard to product size and dimensions. Technical specifications may change without note.

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