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Mineral fibres: basalt, 2020-1-1 · Basalt fibre is a type of continuous fibre prepared from natural volcanic rock and ore after melting at high temperature. The raw material for basalt fibre (andesitic basalt, andesite basalt, diabase and other volcanic rock) belongs to the family of inorganic nonmetallic silicates and is characterized by high Fe 2 O 3 or FeO content. The high Fe 2 O 3 /FeO content in turn leads to a high melt ...