| http://www.w3.org/ns/prov#value | - If the filler is of the type including a foaming agent and the printed layer is made to be porous by heating, the following materials that generally produce nitrogen gas may be used: azo compounds such as azo azodicarbonamide, azobisisobutyronitrile, azocyclohexylnitrile, diazoaminobenzene, barium azodicarboxylate; sulfonyl hydrazide such as benzene sulfonyl hydrazide, benzene sulfonyl hydrazine,
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