AS ISO 16900.4:2015 pdf download.Respiratory protective devices—Methods of test and test equipment Part 4: Determination of gas filter capacity and migration, desorption and carbon monoxide dynamic testing.
6 Principles
6.1 SorptIon tests
L1.1 Gas capacity test
Gas and combined filters are exposed to a defined test gas under given conditions to determine the time when breakthrough of the applied gas occurs at a specified concentrabon.
6.1.2 Gas filter validation test at specified flow rates
Gas and combined filters are exposed to a defined test gas under enhanced flow rates to evaluate whether breakthrough time exceeds a specified minimum.
6.2 Migration and desorption tests
6.2.1 Migration test A and migration test B
Gas and combined filters are exposed to a defined test gas under given conditions. After exposure, the filter is stored under defined conditions, After storage, dean (migrahon test A) or test gas (migration test B) is passed through the filter to determine the ability of the filter to retain the test gas.
6.2.2 Desorption test
Gas and combined filters are exposed to a defined test gas under given conditions, After exposure, clean air is immediately passed through the filter to determine the ability of the filter to retain the test gas.
6.3 Carbon monoxide (CO) dynamic testing of type CO filter
The CO gas filter, or combined filter containing type CO. are exposed to CO under given conditions to determine the effluent CO concentration over time and the integral dose.
7 Apparatus
7.1 Apparatus for constant flow
The test apparatus consists of three modules:
a) challenge gas generator:
b) test chamber.
6.1 SorptIon tests
L1.1 Gas capacity test
Gas and combined filters are exposed to a defined test gas under given conditions to determine the time when breakthrough of the applied gas occurs at a specified concentrabon.
6.1.2 Gas filter validation test at specified flow rates
Gas and combined filters are exposed to a defined test gas under enhanced flow rates to evaluate whether breakthrough time exceeds a specified minimum.
6.2 Migration and desorption tests
6.2.1 Migration test A and migration test B
Gas and combined filters are exposed to a defined test gas under given conditions. After exposure, the filter is stored under defined conditions, After storage, dean (migrahon test A) or test gas (migration test B) is passed through the filter to determine the ability of the filter to retain the test gas.
6.2.2 Desorption test
Gas and combined filters are exposed to a defined test gas under given conditions, After exposure, clean air is immediately passed through the filter to determine the ability of the filter to retain the test gas.
6.3 Carbon monoxide (CO) dynamic testing of type CO filter
The CO gas filter, or combined filter containing type CO. are exposed to CO under given conditions to determine the effluent CO concentration over time and the integral dose.
7 Apparatus
7.1 Apparatus for constant flow
The test apparatus consists of three modules:
a) challenge gas generator:
b) test chamber.
