Sundström SR316 Ammonia Filter K1 (Each)Ammonia filter class K1 (regular 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: 28mm Weight: 132g Carton: 50 units Carbon: The filter contains 80g of activated carbon. Absorption capacity: In tests with 1,000