Shijiazhuang Hongtao Technology Co., Ltd., a professional high-tech enterprise based in Zhengding County, Shijiazhuang, Hebei, China, specializes in R&D, manufacturing and customization of JM32 lightweight mullite refractory insulation bricks—core energy-saving materials for high-temperature industrial kilns and furnace linings, widely applied in metallurgy, ceramic, glass, petrochemical and aerospace industries.

As a high-performance insulating product, JM32 brick is made of high-purity mullite raw materials with Al₂O₃ content ≥77% and Fe₂O₃ ≤0.5%, produced via pore-forming, precision molding and high-temperature sintering. It has a bulk density of 1.35g/cm³, cold crushing strength of 3.5MPa, and excellent thermal stability with -1.5~0.5% linear shrinkage at 1730℃ for 12 hours.

With low thermal conductivity (0.56 W/m·K at 200℃, 0.60 W/m·K at 350℃, 0.64 W/m·K at 600℃), it effectively reduces industrial furnace heat loss and energy consumption, aligning with global energy-saving and emission-reduction goals. It is asbestos-free, features superior thermal shock resistance and chemical inertness, resisting acid and alkali corrosion.

Widely used as insulation linings or back insulation layers in industrial kilns, petrochemical reactors and glass furnaces, it supports standard size (230×114×65mm) and customized solutions. Shijiazhuang Hongtao adheres to innovation, delivering high-quality JM32 products for global industrial partners.