Explanatory notes
… materials including fused silica, materials with a high melting point, such as oxides, carbides, nitrides, graphite … materials including fused silica , materials with a high melting point, such as oxides, carbides, nitrides, graphite … constituents and, where necessary, milling, sieving, filter-pressing, kneading, maturing and de-airing. Some …Legal note
… materials including fused silica, materials with a high melting point, such as oxides, carbides, nitrides, graphite …