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.
HOW IT WORKS
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
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.
NATO Stock no
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
% rh in the head part of the desiccant cartridge
2,5 - 15 (transparent);
Gew.: M16 x 1,5; Filling: 0,35 molecular screene
5 - 25 (transparent);
Gew.: M16 x 1,5; Filling: 0,7molecular screene
10 - 50 (transparent);
Gew.: M16 x 1,5; Filling: 1,5 molecular screene
10 - 17 (transparent);
Gew.: M24 x 1,5; Filling: 1,7 molecular screene
25 - 16 (transparent);
Gew.: M36 x 1,5; Filling: 3,5 molecular screene
25 - 35 (transparent);
Gew.: M24 x 1,5; Filling: 3,5 molecular screene
50 - 70 (transparent);
Gew.: M24 x 1,5; Filling: 7molecular screene
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
||Desiccant capsule KA 0,4 +/- 10%
Filling: 0,5g white gel
||Desiccant capsule KA 1,25
Filling: 1,25g white gel
||Desiccant capsule KA 3
Filling: 3g white gel
||Desiccant capsule KO 0,65
Filling: 0,65g Orange gel
||Desiccant capsule KO 3
Filling: 3g Orange gel
||Desiccant capsule KO 4
Filling: 4g Orange gel
||Desiccant capsule KO 27
Filling: 27g Orange gel
||Desiccant capsule KM 1
Filling: 1 molecular screen
||Desiccant plastic or metal cartridge.
Different shapes and fillings,
||Desiccant cartridge P1; filling: 5
g; Ø 11
2 pcs. per packaging
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