How is fiber cement board manufactured?
Fiber cement board are composed of cement, silica sand and wood pulp. Reinforced fiber cement products such as fiber cement board are manufactured using the ‘Hatscheck Process’. The Hatsheck process was initially developed for the production of asbestos composites, but it is now used for the manufacture of non-asbestos, cellulose fiber reinforced cement composites.
In the Hatscheck Process, unbleached cellulose fibers are re-pulped in warm water at an alkaline pH of 11 to 12.5; the re-pulped fibers are refined and then mixed with cement, silica sand, and other additives to form a mixture. The fiber cement mixture, is deposited on a felt band substrate, vacuum de-watered,and cured to form a fiber reinforced cement matrix in sheet form.
Fiber cement board offer numerous advantages over other traditional materials such as wood siding: they are weatherproof, fire and insect resistant, flexible, highly workable and durable.
Fiber cement board manufacturing process also makes use of autoclave technology. In autoclave technology, polymer based composites are manufactured by applying intense heat and pressure to eliminate moisture from fibre cement materials. This leads to composite consolidation and the result is an extremely strong and robust fibre composite material.
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