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Basic requirement for quality of raw materials:
Limestone: SiO2≥80%, Fineness: ≥ 200 pore, sieve <10%
Cement: ordinary Portland cement with grade of above 32.5.
Fiberglass: fineness is 0.088mm, length is 15-30mm.
Fiber: asbestos or wood pulp or construction PP fiber.
Pulp: unbleached sulfate needle wood pulp or kraft pulp, pulping degree is 20 ~70°SR
Above mentioned contents are basic requirements for raw material. In some case, different raw materials also can produce qualitied products, we will confirm according to the raw materials after being analyzed.
The common proportion of material for fiber cement tile as follows:
Cement 50%, limestone powder 30%-40%, asbestos fiber 6%-8%, pulp fiber 4%-5%, and fiberglass 1%
If no asbestos tile, the proportion of materials as follows:
Cement 50%, limestone powder 30%-40%, wood pulp 8%, pulp fiber 8%, and fiberglass 1%