Basalt fiber: continuous fiber drawn from natural basalt. It is a continuous fiber made by high-speed drawing of platinum-rhodium alloy drawing slipboard after basalt material is melted at 1450℃～1500℃. The color of pure natural basalt fiber is generally brown with metallic luster. Basalt fiber is a new type of inorganic environmentally friendly green high-performance fiber material. It is composed of oxides such as silica, alumina, calcium oxide, magnesium oxide, iron oxide, a nd titanium dioxide. Basalt continuous fiber not only has high strength, but also has many excellent properties such as electrical insulation, corrosion resistance, and high temperature resistance.