FILTERS
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CERTIFICATES OF CONFORMITY
Filter classification
Type
Code Color
Main Applications
A
Brown
Organic gases and vapours with boiling point greater then 65 degrees °C
B
Grey
Inorganic gases and vapours, e.g. chlorine, hydrogen sulphide, hydrogen cyanide, but not carbon monoxide
E
Yellow
Sulphur dioxide, hydrogen chloride and other acid gases
K
Green
Ammonia and organic ammonia derivatives
P
White
Particles, mist, fumes and dust
Filter Class
Max. permissiable concentration
1
2
3
1000 ppm (0,1 % by vol.)
5000 ppm (0,5 % by vol.)
10000 ppm (1,0 % by vol.)