Polycrystalline Mullite Fiber Cotton

Polycrystalline Mullite Fiber Cotton is a loose high-temperature refractory fiber material made with 72% Al₂O₃ and 28% SiO₂. Unlike common glassy fibers, it is produced through a colloidal chemical process. Soluble aluminum and silicon sources are mixed according to the required formulation to form a viscous colloidal fluid. The material is then processed through centrifugal fiber formation and high-temperature crystallization.

This production process creates a stable polycrystalline fiber structure with low weight, high-temperature resistance, and low thermal conductivity. The loose cotton form also makes the material easy to use as a filling layer in furnace insulation systems and other thermal equipment.

The series has a long-term service temperature of up to 1600°C. It is suitable for applications where insulation efficiency, furnace temperature stability, and reduced lining weight are important.

The loose fiber structure allows the material to fill insulation spaces and reduce heat transfer through furnace walls and thermal equipment.

Its thermal conductivity is approximately one-sixth that of ordinary refractory brick, while its volume is about one twenty-fifth of ordinary refractory brick. These properties can help reduce the weight of the insulation layer and lower the amount of heat stored in the furnace lining.

Polycrystalline Mullite Fiber Cotton can be used in vacuum annealing furnaces, industrial heat treatment furnaces, precision metallurgical kilns, and other high-temperature equipment.

The loose fiber can also be further processed through wet vacuum forming. It can serve as the base material for fiber blocks, fiber felts, fiber bricks, modules, components, and special prefabricated parts. This gives equipment manufacturers and furnace projects more options when different insulation shapes or lining structures are required.

Zhejiang Nengcheng Crystal Fiber Co., Ltd. focuses on the development, production, and deep processing of polycrystalline mullite fiber, alumina crystal fiber, and zirconium-containing ceramic fiber.

The factory has established an integrated production system covering raw material production, fiber formation and crystallization, wet vacuum forming, and finished-product machining. The company has 11 years of operating experience and 45 employees. Its team includes personnel responsible for research and development, production processes, quality control, and technical service.

For bulk purchases of product or further development of formed fiber products, technical staff can discuss product selection based on the customer's operating temperature, furnace structure, and insulation method.

OEM, ODM, and non-standard product development are also available according to technical drawings or physical prototypes. This allows loose fiber supply and further forming or machining to be handled within the same production system.