BS 8468-1:2020 pdf download.Respiratory protective devices for use against chemical, biological, radiological and nuclear (CBRN) agents Part 1: Positive pressure, self-contained, open-circuit breathing apparatus一. Specification.
4 Requirements
4.1 General
SCBA for use against CBRN agents shall be positive pressure equipment conforming to BS EN 131.
Type 1 or Type 2, and conforming to the inward leakage specified In £4 of this British Standard and conforming to the chemical agent permeation and penetration and resistance specified in £5 of this British Standard.
Where the apparatus has been designed to be used at temperatures outside those specified in BSE1L132, the manufacturer shall have tested and marked the product appropriately.
4.2 Preconditioning
Samples shall be preconditioned in accordance with BS EN 137 prior to visual inspection and testing for inward leakage and chemical agent permeation and penetration.
4.3 Visual inspection
Visual inspection shall be in accordance with BS 8468-8:2020, Clause 6. A minimum of two samples shall be inspected.
4.4 Inward leakage
The maximum inward leakage shall be <0.01% when tested as a complete system in accordance with BS EN 13274-1:2001, 8.4c) with 10 test subjects. A minimum of two devices shall be tested.
NOTE This requirement is more stringent than the one given in BS EN 137. Detection systems should take account of the increased sensitivity required.
4.5 Chemical agent permeation and penetration
SCBA shall be resistant to chemical agents when tested as a complete system in accordance with BS 8468-8:2020, type CBRN3, using the HD droplet patterns given in Figure 1. and Figure 2 of this British Standard.
4.1 General
SCBA for use against CBRN agents shall be positive pressure equipment conforming to BS EN 131.
Type 1 or Type 2, and conforming to the inward leakage specified In £4 of this British Standard and conforming to the chemical agent permeation and penetration and resistance specified in £5 of this British Standard.
Where the apparatus has been designed to be used at temperatures outside those specified in BSE1L132, the manufacturer shall have tested and marked the product appropriately.
4.2 Preconditioning
Samples shall be preconditioned in accordance with BS EN 137 prior to visual inspection and testing for inward leakage and chemical agent permeation and penetration.
4.3 Visual inspection
Visual inspection shall be in accordance with BS 8468-8:2020, Clause 6. A minimum of two samples shall be inspected.
4.4 Inward leakage
The maximum inward leakage shall be <0.01% when tested as a complete system in accordance with BS EN 13274-1:2001, 8.4c) with 10 test subjects. A minimum of two devices shall be tested.
NOTE This requirement is more stringent than the one given in BS EN 137. Detection systems should take account of the increased sensitivity required.
4.5 Chemical agent permeation and penetration
SCBA shall be resistant to chemical agents when tested as a complete system in accordance with BS 8468-8:2020, type CBRN3, using the HD droplet patterns given in Figure 1. and Figure 2 of this British Standard.
