Using selected high-quality fiber and continuously improving production processes, the insulation performance of this product is close to viscose-based carbon felt, and also the life is longer than PAN-based carbon felt. It has good insulation performance, ablation resistance, high purity, low ash content, high strength and other characteristics, and it has an extremely high cost performance ratio. This product is widely used in single crystal growth furnaces, polysilicon ingot furnaces, medium frequency induction furnaces and graphite resistance high-temperature furnaces.