Mask accessories

Protective filters


General information

The filters are designed to trap harmful substances from the air passing through them. They can be used as components of breathing systems in environments containing a minimum of 17 vol.% oxygen. The filter classification system and parameters are as laid down by EN 141, 143. The filters are attached to full face masks through standardized threaded connections. A filter against gases or against particulate matter must be chosen in dependence on the particular situation; combined filters are also available

Gas filters

Gas filters trap harmful gases or vapours by physical sorption of chemisorption on specifically treated activated carbon. Each filter type, identified by a coloured stripe along the circumference, is designed for trapping a specific group of substances, as set by ČSN EN 141.

Filter type Colour of labellingPrincipal use
ABrownOrganic gases and vapours with a boiling point > 65˚C
BGreyInorganic gases (hydrogen cyanide, hydrogen sulfide, chlorine)
EYellowSulfur dioxide, hydrogen chloride

The A, B, E, and K type filters are further divided into classes according to their trapping capacity:

  1. low, limited to 0.1 vol.% harmful substances in the air
  2. medium, up to 0.5 vol.% harmful substances in the air
  3. high, up to 1 vol.% harmful substances in the air

The filters are labelled accordingly, e.g. A1, K2, ...

Filters against particulate matter

Filter against particulate matter are used to trap airborne particulate matter such as dust and solid or liquid aerosols. Such filters are labelled with a white stripe along their circumference. Three filter classes with different separation efficiencies are manufactured as specified by ČSN EN 143.

ClassSeparating powerUse
P1LowAnnoying dust
P2MediumNon-toxic solid and liquid aerosols
P3HighToxic and radioactive solid and liquid aerosols, bacteria and viruses.

Combined filters

Combined filters remove both harmful gaseous substances and particulate matter of the above groups. Labelling, including the colour stripes along the circumference, identifies the filter type and class. Filters labelled D are special gas filters tested for clogging with dust.

Example of filter labelling: A2B2E2K2P3

The filters are fitted with connecting threads Rd 40 x 1/7” ČSN 148 – 1 or OZ 40 x 4 mm (GOST 8762-75 and older standards,) the latter mainly for older masks of the CM series. The thread type is indicated on the filter.

The body is made of a light aluminium alloy or plastics, making for a long service life and shelf life. Aluminium alloy filters must not be used in explosive environments. Filters designed for direct attachment to a face mask must not be heavier than 500 g.

Guaranteed sorption capacities of the filters as set out by ČSN EN 141

Type and classTest gasMinimum penetration time under the test conditions (min)Test gas concentration in air (vol.%)
A1Cyklohexyne (C6H12)700,1
B1Chlorine (Cl2)20
B2Sulfane (H2S)20
B3Hydrogen cyanide (HCN)30
E1Sulfur dioxide(SO2)200,1
K1Ammonia (NH3)501,0

Filter use guidelines

  1. Choose a suitable filter and its thread with care.
  2. The filters are intended for environments with a minimum of 17 vol.% oxygen and with known types and concentrations of harmful substances.
  3. Store the filters in their original packaging. Do not use them after expiration of their shelf life.
  4. After opening the protective packaging, make sure that:
    • The lower and upper filter plugs are in good condition
    • The thread identification matches that of the mask for which it is intended
    • The right one of the 2 variants has been chosen, i.e. either OZ 40x4 mm or OZ 40x1/7“.
  5. Before using a breathing apparatus, remove the two seals from the filter and make sure that the complete device is airtight (close the inlet opening of the filter with your hand). No false suction must occur during inhalation.
  6. Once opened, a filter must be replaced no later than within 6 months irrespective of whether it was in use or not.
  7. Since many factors contribute, the length of time for which a filter can be used cannot be determined beforehand. The factors include, in particular, the types and concentrations of the air contaminants, relative humidity, breathing intensity and temperature. If you can smell contaminants having penetrated through the filter, replace the filter immediately.
  8. Filters against odourless gases should be replaced after a single use.
  9. Resistance to breathing increases as particulate matter builds up in the filter. The filter must be replaced if the resistance is too high.
  10. The filters are maintenance-free.
  11. Store the filters in dry ventilated areas at -10˚C to + 50˚C and 0% to 95% relative humidity.
  12. The filters cannot be used in an oxygen atmosphere or in oxygen-enriched air.
  13. Store the filters in the prescribed conditions. Keep them away from substances that could have an adverse impact on the filters or the packaging. The filters or their contents must not be used for any purpose other than as intended.


Brašna zelená

Bag intended for police and special squads

A textile bag for civilian and police uses. It is intended for a protective mask and 2 filters which are accommodated in the lower detachable part. The mask can also be carried in the ready state with a filter mounted on and with a replacement filter as a reserve.

The bag is fitted with a shoulder strap and with two loops for attaching to the belt. A compression belt enables the bag content to be fixed.

Material:waterproof fabric
Size (H x W x D):28x24x12 cm
Brašna zelená

Civilian bag

A simple bag, in green, for civilian uses. The bag is fitted with a shoulder strap.

Material:waterproof fabric
Size (H x W x D):20x27x12 cm

Zásahová přilba s maskou

Police intervention helmet

To customer's order, the CM-6 mask can be fitted with a two-point fastening system for use in combination with a police intervention helmet.

Plastic bottle with a special safety stopper

Plastová láhev

The bottle enables the user to drink liquids in the contaminated area with the mask on.

Volume:0,8 l

JP-90 single-use protective suit

Jednorázový ochranný oblek JP-90

The JP-90 single-use hood protects the user's body surface and outfit from coarse dispersed aerosols and droplets of chemical and biological warfare agents and other toxic substances and radioactive dust.

The JP-90 hood is intended for the user's necessary protection during the time required to leave the contaminated area following attack with weapons of mass destruction. The suit is completed with simple gloves and shoe covers with reinforced soles.

Material:PELD-PELLD plastic sheed
Volume:0,8 l
The outfit is made in one size fits all


IMTRADEX communication system

All our masks are compatible with IMTRADEX headsets for easy radio communication

CamelBak hydration system

The liquid intake system for our masks is compatible with the CamelBak hydration system.