Explanatory notes
… articles are obtained by firing inorganic, non-metallic materials which have been prepared and shaped previously at, … in general, room temperature. Raw materials comprise, inter alia, clays, siliceous materials including fused silica, …Legal note
… articles are obtained by firing inorganic, non-metallic materials which have been prepared and shaped previously at, … in general, room temperature. Raw materials comprise, inter alia, clays, siliceous materials including fused silica, …