Historical
DIN EN 1827:1999
Respiratory protective devices - Half masks without inhalation valves and with separable filters to protect against gases or gases and particles or particles only - Requirements, testing, marking (Foreign Standard)
The document specifies performance requirements, test methods and marking requirements for half-masks (re-usable) without inhalation valves and with separable filters.
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Deutsches Institut für Normung [din]