Class A Pyroxylin Products : Those products made from material over in. (2. 5 mm) thick and weighing over 0. 5 oz (14 g) and that are not finely divided during manufacture into teeth, scrollwork, or projections
NFPA 42 Code for the Storage of Pyroxylin Plastic, 2002 ed. https://www.nfpa.org/assets/files/AboutTheCodes/42 /42-A2002-rop.pdf, (Code: Code for the Storage of Pyroxylin Plastic Storage of Pyroxylin Plastic - Amer) {203 NFC}