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No, the filter is not safe! Please do not use a mask's article or talk page to discuss filter safety. |
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Filters listed in this article are known to contain materials hazardous to health Exercise caution when handling and storing. Refrain from using these filters. Seek medical advice if you have any concerns. |
The GP-5 filter canister is a Soviet-made 40mm (GOST thread) combination NBC filter issued for civil defence purposes. Introduced during the 1960s, the filter, issued in the GP-5 kit, was mass-manufactured and is the most common filter in the world at present.
Description
GP-5 filters come in an olive-drab colored metal canister with a screw-on cap whose color varies on what batch the filter is. It features exterior markings that show the filter model, batch and year of manufacture and other markings on the top, bottom and on the inlet aperture itself. These markings can sometimes be printed sideways, smudged, or simply illegible on some examples.
The filter uses a coiled up particulate filter pad for aerosols and smoke which is mounted directly above a seven-holed concave metal disc that simply separates this stage from the intake hole on the bottom. The particulate pad is affixed to the filter's bottom plate under a large metal ring via thick particle paper which has been glued into a small groove that runs the entire inside edge of the bottom plate.
Above the particle stage is a compartment separated by a perforated grid covered by fine mesh which contains the activated charcoal layer used to filter vapors and other chemicals. The ridge in the middle of the canister holds this first grid in place, while the space below the ridge is taken up almost entirely by the particulate stage. Another identical meshed grid is installed near the top of the filter with a cloth layer covering it. A fixing ring that runs the entire circumference of the canister with a metal 'plus' shape holds the cloth taut above the mesh.
Markings
On the top, the model designation can be found which is ГП-5 (GP-5) under it the manufacturing date in day-month-year format and next to this the charcoal mass in grams is placed. Under these, the batch number can be seen (Ф-xxx).
Asbestos content
Lab reports from the Netherlands and Finland have confirmed the presence of asbestos in the GP-5 filter, in both the particulate layer and the activated carbon (likely due to contamination), in filters produced up to at least 1988, with use in subsequent years seeming certain.[1][2]
Gallery
References
- ↑ File:337992e9-de99-4358-addb-3ced34dd6054.jpg (in Dutch)
- ↑ File:Photo_2017-08-09_10-29-35.jpg (in Finnish)
