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.

APPLICATIONS
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.

COMPONENTS
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.

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

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.

PACKAGING
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.

PROTECTIVE SLEEVES
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.

PRODUCT RANGE

Refer- ence- no.	Supply no. NATO stock no.	Description	Dimensions (mm)
		Desiccant cartridges for optical and precision mechanical equipment in compliance with VG 95 239 made of black polystyrene with vision panel and humidity indicator for 40% RH at the top of the desiccant cartridge	Fitting length
1	4440-12-158-5262	Nominal size 2,5 – 15 (transparent); Weight M16 x 1.5; filling: 0.35 g molecular sieves	15
2	4440-12-158-5263	Nominal size 5 – 25 (transparent); Weight M16 x 1.5; filling: 0.7g molecular sieves	24
3	4440-12-158-5264	Nominal size 10 – 50 (transparent); Weight M16 x 1.5; filling: 1.5 g molecular sieves	50
4	4440-12-175-4087	Nominal size 10 – 17 (transparent); Weight M24 x 1.5; filling: 1.7 g molecular sieves	17
5	4440-12-175-4086	Nominal size 25 – 16 (transparent); Weight M36 x 1.5; filling: 3.5 g molecular sieves	16
6	4440-12-158-5265	Nominal size 25 – 35 (transparent); Weight M24 x 1.5; filling: 3.5 g molecular sieves	35
7	4440-12-158-5429	Nominal size 50 – 70 (transparent); Weight M24 x 1.5; filling: 7g molecular sieves	70
8	4440-12-154-7226	Nominal size 100 – 45 (transparent); Weight M36 x 1.5; filling: 14 g molecular sieves	45
		The nominal size of 100, for example is used to describe the empty volume of a device with a maximum capacity of 100 dm3. The VG 95 239 desiccant cartridges are securely screwed into the protective sleeves and the top of the cartridge as well as the protective sleeves are secured with a red adhesive tape.
		Plastic desiccant capsules (cylindrical container) with a porous cardboard cover. Non-regenerative.
9	HKS000009	Desiccant capsules KA 0.5 Filling: 0.5 g White silica gel	Ø 15 height 8,2
10	HKS000001	Desiccant capsules KA 0.5 Filling: 0.5 g White silica gel	Ø 12,7 height 9
11	HKS000002	Desiccant capsules KA 1.25 Filling: 1.25 g White silica gel	Ø 20 height 10
12	HKS000301	Desiccant capsules KA 0.65 Filling: 0.65 g silica gel	Ø 15 height 10
13	HKS000300	Desiccant capsules KA 3 Filling: 3 g silica gel	Ø 29 height 10
		Metal or plastic case desiccant cartridges Different shapes and fillings, partly exchangeable.
14	4440-12-140-2234	Desiccant cartridge P1; Filling: 5 g; 2 units each in one box	Ø 11 height 36

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.