![]() ![]() 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. Under these, the batch number can be seen (Ф-xxx). 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. A fixing ring that runs the entire circumference of the canister with a metal 'plus' shape holds the cloth taut above the mesh. ![]() The silicone rubber adjustable headpiece makes this one of the more. Another identical meshed grid is installed near the top of the filter with a cloth layer covering it. The 180-degree field of view is a nice touch and the lens is anti-fog so no need to take the mask off repeatedly to clean. A British surgeon published a paper in 2011 showing. 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. The GP-5 filter canister is a Soviet-made 40mm (GOST thread) combination NBC filter issued for civil defence purposes. If you can’t stop the fogging by tightening the seal of your mask, you can try anti-fog home remedies to coat your lenses. 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.Ībove 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 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. These markings can sometimes be printed sideways, smudged, or simply illegible on some examples. 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. 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. ![]()
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