Sundström SR295 Ammonia Filter K2 (Each)Ammonia filter class K2 (high capacity). Material: Plastic polypropylene. No metal parts. Usage: Used against ammonia vapour. The filter fits into the filter attachment of Sundstrm's half and full face masks. An SR510 particle filter can be snapped onto the front of the filter. Size: Largest diameter: 106 mm Thickness: 48mm Weight: 235g Carton: 30 units Carbon: The filter contains 166g of activated carbon. Absorption capacity: In tests with 5,000 ppm