BS 8468-6.2:2020 pdf download.Respiratory protective devices for use against chemical, biological, radiological and nuclear (CBRN) agents Part 6.2: Constant flow compressed air line equipment一 Specification.
A minimum of two devices shall be tested, at least one in the as-received state and one preconditioned in accordance with 4.2.
4.5 Chemical agent permeation and penetration
Where the apparatus can be tested in accordance with BS 8468-8, it shall be tested as a complete system in accordance with the requirements for type CBRNI or type CBRN3 devices. Type CI3RN3 devices shall use the lID droplet patterns given in Figure ito Figure 5 of this British Standard.
Where the apparatus cannot be tested in accordance with BS 8468.8, it shall be tested against all of the liquid test chemicals listed in BS 8467:2006, Annex D. The highest cumulative permeation for the exposed materials of the apparatus, including the compressed-air supply tube (CAST), for each chemical over 4 h shall not exceed 1.25 pg/cm2.
A liquid concentration density for each chemical of 10 g/m shall be applied as nominal 1 pL drops uniformly over the sample surface. Where a seam closure or fixture is included, at least three drops shall be applied at each critical iuncture, such as the seam edge. The test cell shall be assembled in the open configuration.
NOTE Where components are made of materiaLc Identical (in composition and minimum thickness) to those used previously and have been shown to meet these requirements as part of ocher devices that conform to this British Standard then this information may be used to demonstrate conformity in this instance.
5 Marking
Marking shall be in accordance with the relevant clauses of BS EN 14594.
In addition, each apparatus conforming to this British Standard shall be permanently marked with the standard identifier and year. i.e. 85 8468-6.2:2020’, and type CBRN 1 or type CBRN3, as appropriate.
4.5 Chemical agent permeation and penetration
Where the apparatus can be tested in accordance with BS 8468-8, it shall be tested as a complete system in accordance with the requirements for type CBRNI or type CBRN3 devices. Type CI3RN3 devices shall use the lID droplet patterns given in Figure ito Figure 5 of this British Standard.
Where the apparatus cannot be tested in accordance with BS 8468.8, it shall be tested against all of the liquid test chemicals listed in BS 8467:2006, Annex D. The highest cumulative permeation for the exposed materials of the apparatus, including the compressed-air supply tube (CAST), for each chemical over 4 h shall not exceed 1.25 pg/cm2.
A liquid concentration density for each chemical of 10 g/m shall be applied as nominal 1 pL drops uniformly over the sample surface. Where a seam closure or fixture is included, at least three drops shall be applied at each critical iuncture, such as the seam edge. The test cell shall be assembled in the open configuration.
NOTE Where components are made of materiaLc Identical (in composition and minimum thickness) to those used previously and have been shown to meet these requirements as part of ocher devices that conform to this British Standard then this information may be used to demonstrate conformity in this instance.
5 Marking
Marking shall be in accordance with the relevant clauses of BS EN 14594.
In addition, each apparatus conforming to this British Standard shall be permanently marked with the standard identifier and year. i.e. 85 8468-6.2:2020’, and type CBRN 1 or type CBRN3, as appropriate.
