The MS-4 Filter was a polish made gas mask filter designed for Civil Defence use.
Overview[]
MS-4 filter was produced in two colors: green and gray. It was included in the kit with the MC-1 mask.
The production of MS-4 filters started in the 1980s and ended in 1994 with the introduction of the new P-5 filter.
The website of the civil defense of the Republic of Poland describes the MS-4 filter in the following words:
The MS-4 filter is inferior to the MS-3 version in terms of the quality of the carbon sorbent used. In the older model, a heavily activated Soviet-made sorbent was used, in the newer model - an attempt was made to crush the coarse-grained sorbent, which resulted in the loss of the most valuable absorbing fractions, while its amount in the absorber was not increased, which certainly lowered its parameters.[1]
Safety[]
There have been lab tests on this filter questioning if it contains anything harmful and it was concluded that they do not contain asbestos.
Below is a report proving the absence of asbestos in the MS-4 filter.
