BS 8468-6.2:2020 pdf free.Respiratory protective devices for use against chemical, biological, radiological and nuclear (CBRN) agents.
BS 8468-6.2 This British Standard specifies requirements for compressed air line breathing apparatus with constant airflow as a respiratory protective device intended to be used during rescue, evacuation,escape, hazard containment and decontamination, and similar activities by emergency first responders or first receivers (e.g. fire, ambulance, police, and associated civilian agencies and workers) in areas containing and contaminated by chemical, biological, radiological and nuclear (CBRN] agents.This British Standard contains requirements for testing and marking.This British Standard is applicable to Type CBRN1 or Type CBRN3 devices, according to their intended use.Type CBRN1 devices provide protection against hazardous particulate matter and gaseous chemical agent permeation and penetration.Type CBRN3 devices provide protection against hazardous particulate matter and gaseous and liquid
chemical agent permeation and penetration. Requirements for methods of and criteria for decontamination of respiratory protective devices (RPD) are not specified in this British Standard.
NOTE Compressed air line breathing apparatus conforming to this British Standard might be suitable for use in situations other than those involving the specific CBRN agents identified in this British Standard.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 CBRN1 or type CBRN3 devices. Type CBRN3 devices shall use the HD droplet patterns given in Figure 1 to 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 ug/cm2.A liquid concentration density for each chemical of 10 g/m2 shall be applied as nominal 1 μ drops uniformly over the sample surface. Where a seam closure or fixture is included, at least three drops shall be applied at each critical juncture, such as the seam edge. The test cell shall be assembled in the :open configuration.BS 8468-6.2 pdf download.