The EN 943 standard specifies the minimum requirements, test methods, marking and information supplied by the manufacturer for ventilated and unventilated gas-tight chemical protective suits.
Type 1a, 1b, 1c: EN 943-1 “Protective clothing against dangerous solid, liquid and gaseous chemicals, including liquid and solid aerosols – Part 1: Performance requirements for Type 1 (gas-tight) chemical protective suits”
EN 943-2 “Protective clothing against dangerous solid, liquid and gaseous chemicals, including liquid and solid aerosols – Part 2: Performance requirements for Type 1 (gas-tight) chemical protective suits for emergency teams (ET)”.