N:34%Min Fe:1.0%Max C: 1.5%Max Si3N4:85%Min Ca:0.6%Max Al:0.8%Max O:2.5%Max
N:36%Min Fe:0.5%Max C: 1.0%Max Si3N4:90%Min Ca:0.5%Max Al:0.5%Max O:2.0%Max
N:38%Min Fe:0.4%Max C: 1.0%Max Si3N4:95%Min Ca:0.4%Max Al:0.4%Max O:2.0%Max
N:39%Min Fe:0.1%Max C: 0.5%Max Si3N4:99%Min Ca:0.1%Max Al:0.1%Max
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