Classification of fiber cement board

The earliest fiber cement board produced in our country is made of asbestos reinforced fiber. It is divided into building asbestos cement board and electrical asbestos cement board, and a considerable part of it is used as heat-resistant plate in electric furnace. At present, there are many reinforced fiber varieties in fiber cement board, asbestos, plant fiber and organic synthetic fiber have been widely used, and a variety of fiber mixing as reinforcement materials to change and improve the performance of products. Asbestos-free fiber cement board is the main variety at present and in the future. Cementable material has also developed from a single silicate fire board to the current mix of cement + silica material to produce low shrinkage fiber cement board.

The fiber cement board is generally classified from the surface state of the board, the applicable environmental conditions, the shrinkage size of the board, the functional material, the application field, the thickness of the board and the board function.

(1) According to the surface treatment status, it is divided into original board (code name is YB), single-sided sanded board (code name is DB), double-sided sanded board (code name is SB).

(1) The original plate: is in the molding of simple molding hardening or plate press compaction after the plate, after curing and hardening, the surface without any treatment, maintain the original state of the surface of the plate, is the most initial state of the plate. The surface flatness and thickness uniformity of the original plate are poor.

② Single-sided sanding: refers to one side of the plate, according to the needs of the subsequent processing technology, after the hardening of the plate for a single surface sanding, sanding the original board surface floating slurry, to meet the requirements of the smoothness of the processing, but can not reach the thickness uniformity of the double-sided sanding.

③ Double-sided sanding: refers to the positive and negative sides of the plate are sanded to improve the surface smoothness and thickness uniformity. One is to smooth the surface for subsequent processing, the other is to sand to the required plate thickness, so that the thickness of the same batch of plates has a higher uniformity, in line with the needs of subsequent processing.

At present, for the light composite inner wall board, ceiling board and other materials, in the late construction also need to be coated, or veneer treatment, the general choice of the original board; Later need to carry out industrial finishing treatment, such as after mechanical coating treatment, transfer printing, roller coating, coating and other fiber cement board and calcium silicate board finishing processing, choose single sand or double sand board.

(2) Divided into three categories based on applicable environmental conditions.

Class A: Suitable for outdoor use and may withstand direct sunlight, rain, snow or frost.

Class B: suitable for environments that may withstand heat, humidity and infrequent frost for a long time. For example, underground facilities, alternating heat and humidity or outdoor indirect sunlight, rain, snow, frost and other environments.

Class C: suitable for indoor use, likely to be exposed to heat or moisture, but not frost. Examples include interior walls, floors, tile linings, or baseboards.

According to the use of classification, mainly according to the performance of the plate in different environmental conditions, how to choose the right plate, where the environmental conditions refers to temperature, humidity, light, frost or freezing. The environment is different, the performance requirements of the plate are also different, the use of indoor plate, under normal circumstances, the change of temperature and humidity is relatively small, also not subject to ultraviolet radiation and rain, in a relatively stable environment, the requirements of the plate is mainly in the mechanical properties can meet the requirements of safety performance, the requirements of weather resistance is relatively low. And used in the outdoor plate, vulnerable to direct sunlight, rain or frost, the quality of the plate in addition to meet the safety requirements of mechanical properties, more important is the weatherability of the plate, must be able to withstand the impact of repeated extreme conditions. The southern region has more rain, and the plate is exposed to the rain from the sun to the rain in thunderstorm days, which requires the plate to have a high heat and rain function. In the northern region, the winter is cold, the plate needs to endure the influence of extremely cold and low temperature, often in the process of freezing and thawing repeatedly alternating, the plate must have good frost resistance. Therefore, in the 2018 version of the industry standard, the plates are divided into three categories: A, B and C, and the environmental conditions of the three plates are given to meet the requirements of different conditions.

(3) According to the wet swelling rate index, it is divided into ordinary plate (code name PS) and low shrinkage plate (code name DS).

Cement-based materials, dry shrinkage wet swelling is inherent performance. In fiber cement board, more than 50% of the cementing material is Portland cement, so the board has a certain wet swelling rate, the wet swelling rate will directly affect the installation mode of the board, long-term use of safety and so on. Although under the continuous innovation of new materials and new processes, the wet swelling situation of plates has been improved, but it has not been fundamentally solved. The plate is divided into common plate and low shrinkage plate two kinds, low shrinkage plate wet swelling rate < 0.25%, the wet swelling rate of common board < 0.50%. In use, according to different application fields and different installation methods, select different wet swelling rate of the plate.

(4) According to the different uses of the board, it can be divided into the following categories:

① Internal partition wall board;

② Interior wall decorative board;

③ Exterior wall panel;

④ Ceiling board;

⑤ Floor panel;

(6) Roofing panels;

(7) Ecological garden architecture and plank road;

(8) Marine board;

(9) Tunnel plate.

(5) According to the use function of the board can be divided into the following nine kinds:

(1) Ordinary building board;

② Electrical board;

③ Fire board;

(4) Insulation board;

(5) explosion-proof pressure relief plate;

(6) Sound insulation and sound absorption board

(7) Coating board;

(8) Anti-static board;

(9) Medical clean board.

(6) According to the density of the plate can be divided into:

① Low density board: density < 1.0 g/cm;

② Medium density board: density of 1.0~1.5g/cm;

③ High density board: density > 1.5g/cm.

(7) According to the thickness of the plate can be divided into:

① Thin plate: thickness less than 8mm; Use hidden areas in sub-rooms

② Medium thickness plate: thickness of 8~20mm; Non-load-bearing structures such as the top surface of sub-indoor external walls are used.

③ Thick plate: thickness greater than 20mm. The ground part of the sub-building is not used as a small load-bearing structure.