Shijiazhuang Chenxing Industrial Co., Ltd. produces fire-retardant boards made from expanded vermiculite and fire-retardant adhesives, formed through hot pressing. They feature light weight, high strength, good toughness, fire and heat insulation, and easy installation. They have a combustion performance of A1 grade and a material smoke toxicity of ZA1 grade. They are widely applicable in high-rise frame buildings, communication pipelines, fireplaces, ovens, high-speed trains, kilns, fire door cores, aluminum plants, steel mills, and other industries.