(Continued)
3.2 Calcium silicate board
Calcium silicate board is a kind of building material which is made of siliceous material (main component SiO2, such as quartz powder, fly ash, diatomite, etc.), calcareous material (main component is Cao, such as lime, calcium carbide mud, cement, etc.), reinforcing fiber, auxiliary agent, etc. according to a certain proportion. It is a kind of building material which is made by the processes of slurry preparation, papermaking (slurry or molding), high pressure steam curing, etc. The product has the characteristics of fire prevention, moisture-proof, sound insulation, insect proofing and good durability. Due to its moderate strength, light weight, good processability and non flammability, it is widely used in ship’s cabin board, suspended ceiling, non load bearing inner wall of building and other places with fire protection requirements. It is an ideal decorative plate for ceiling and partition.
3.2.1 Classification of calcium silicate board
Calcium silicate board can be divided into two categories: thermal insulation calcium silicate board and decoration calcium silicate board.
Calcium silicate board for thermal insulation
Thermal insulation calcium silicate board, also known as microporous calcium silicate board, is a kind of white hard insulation material. The thickness is usually more than 30mm. The density is in the range of 0.2 ~ 1.0kg/m3. It has the characteristics of light weight, high strength, small thermal conductivity, high temperature resistance, corrosion resistance and energy cutting saw. It has been widely used in the fields of electric power, metallurgy, petrochemical, construction, ship and other fields for heat insulation and fire and sound insulation of wall and roof.
Calcium silicate board for decoration
In addition to the function of traditional gypsum board, calcium silicate board for decoration has superior fire resistance and moisture resistance. And its service life is very long. The thickness of this kind of plate is usually between 4 and 20 mm. And the specification is mainly 1220 mm × 2440 mm.
3.2.2 Performance characteristics of calcium silicate board
Fireproof performance: it is non combustible A1 grade material. In case of fire, the plate will not burn and produce toxic smoke.
Waterproof performance: it has good waterproof performance. It can maintain stable performance in high humidity places such as toilet and bathroom, and will not expand or deform.
High strength: high strength, the strength of 6 mm thick board can greatly exceed that of 9.5 mm thick ordinary gypsum board. The wall made of calcium silicate board is solid and reliable, and is not easy to be damaged and broken.
Dimensional stability: it has low wet expansion rate and dry shrinkage rate, and small size deformation.
Heat insulation and sound insulation: it has good heat insulation performance and good sound insulation effect.
Long service life: acid and alkali resistant, not easy to corrosion, and will not be damaged by moisture or insects. So it has a long service life.
3.2.3 Main uses of calcium silicate board
Calcium silicate board is mainly used in wall, ceiling, floor, road sound insulation, sound absorption barrier, ship compartment and air duct, as well as sound-absorbing wall, sound-absorbing ceiling, pouring wall, composite wall panel and other fields.
4.Analysis of new revised standards for fiber cement board and calcium silicate board
In 2017, the four flat panel standards of JC / T412 and JC / T564 were revised respectively, and the standard draft for approval has been formed. This revision redefines the fiber cement board and calcium silicate board, and makes major adjustments to the product application field, specific quality index, and weather resistance of the product, so as to more clearly distinguish the raw materials, product classification and production process of the fiber cement board and calcium silicate board.
4.1 About product definition
The definition of fiber cement board and calcium silicate board is modified.
Fiber cement sheets: cement is used as cementitious material, organic synthetic fiber, inorganic mineral fiber or cellulose fiber are used as reinforcement materials, which are molded, pressurized (or not pressurized), autoclaved (or not autoclaved) cured.
Fiber reinforced calcium silicate boards: the board is made of siliceous and calcareous materials as the main cementation materials, inorganic mineral fiber or cellulose fiber and other fibers as reinforcement materials through molding, pressure (or non pressure) and steam pressure curing.
It can be seen from the definition that the raw materials used by the two products are different, so the performance of the products is also different.
4.2 About product classification
The product classification is changed from the original density classification to the classification according to the use, which clarifies the different application fields of A, B and C boards, especially the class a board, which is suitable for outdoor use and is in line with international standards.
4.3 About product appearance quality
Fiber cement board and calcium silicate board are produced on the same process platform. Therefore, the appearance quality and size are the same, and the requirements of shape deviation and size deviation are the same.
4.4 Comparison of physical and mechanical properties
The physical and mechanical properties of fiber cement board are better than that of calcium silicate board, but the shrinkage performance of calcium silicate board is better than that of fiber cement board, especially for the fiber cement board cured by ordinary steam. Its shrinkage and wet expansion rate is large, which has been limited in the application field.
From the perspective of application field, although the two kinds of plates are divided into A, B and C, and the applicable environmental conditions are basically the same. The necessary technical treatment must be adopted in the production process of calcium silicate board, including the selection of raw materials, process formula, production technology, etc., so it is difficult to meet the standard requirements.
4.5 About product application field
From the perspective of performance and weather resistance of the two products, fiber cement board should be preferred for exterior wall and calcium silicate board for interior wall decoration.
(To be continued)
Sinopower Industries Group Limited can supply you high quality fiber cement board /calcium silicate board production line machinery. Welcome to visit our factory and working site.
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Post time: Aug-24-2020