A wide range of cartridges with plastic body, single internal threaded connection.Tested against standard EN14387. This respiratory equipment is acceptable for use in explosive atmospheres with a dust risk (zone 21), and a gas risk for the groups I and IIA (zone 1); for occasional exposure. This filter can be used in combination with the half face masks N5500 Class 1 (N6555003) and N7700 Class 1 (N6577003).