1.Preface
Fiber cement products are usually divided into fiber cement board, fiber cement pipe and fiber cement corrugated tile.
Fiber cement board and calcium silicate board are common building decoration materials in the market, and they are also the two main flat products produced by fiber cement products enterprises. There are many similarities and even similarities in the appearance and composition of the two kinds of boards, which can not be distinguished by non professionals, resulting in the confusion between calcium silicate board and fiber cement pressure plate, and mistakes in the selection of users. In fact, they are two completely different products, which belong to different product series in the national industry standard number. The industry standard of fiber cement board is JC / T412.1 “non asbestos fiber cement board”, JC / T412.2 “chrysotile asbestos fiber cement board”. The industry standard of calcium silicate board is JC / T564.1 “non asbestos calcium silicate board” and JC / T564.2 “chrysotile asbestos calcium silicate board”. In 1991, JC / T412-1991 “asbestos cement plate for building” was formulated, which was the first flat fiber cement product standard in China. In 1994, JC / t564-1994 “fiber reinforced calcium silicate board” industry standard was formulated. Since then, these two kinds of boards have been developed rapidly and become important building materials. In 2006 and 2008, the standards of the above two kinds of boards were revised. According to the varieties of reinforced fibers, the standards were divided into two categories: non asbestos board and chrysotile asbestos board, highlighting the non asbestos board and making it the development direction of the industry. Since 2014, a new round of standard revision has been started according to the latest technical requirements. And the standard draft for approval has been submitted in 2017.
Fiber cement board and calcium silicate board are two kinds of products with different properties which can be produced in the same production line. There are similarities and differences between them. This paper introduces and compares the performance of the two kinds of boards and analyzes the industry standards of the two kinds of board.
2.Common points of fiber cement plate and calcium silicate board
There are similar components in the raw materials, which are reinforced by fibers and based on hardened pastes.
After pulping, papermaking (or pulping) process molding, maintenance, follow-up processing of the production process.
The appearance quality, shape and dimension deviation requirements are consistent.
There are many overlapping areas in the scope of application.
3.Comparison between fiber cement board and calcium silicate board
3.1 Fiber cement board
Fiber cement board, also known as fiber reinforced cement board, is a kind of hydraulic board, which is produced by cement hydration reaction. It can be divided into chrysotile asbestos fiber cement board and non asbestos fiber cement board according to the different types of added fiber. It can be divided into fiber cement non pressing plate and fiber cement plus pressing plate according to the different molding pressure. According to the different curing conditions, it can be divided into atmospheric steam curing plate and high pressure steam curing plate.
3.1.1 Classification of fiber cement board
According to the types of reinforced fiber, it can be divided into chrysotile asbestos fiber cement plate reinforced by asbestos fiber and non asbestos fiber cement plate reinforced by organic and inorganic fibers such as pulp, sawdust and glass fiber without asbestos fiber.
According to the density, it can be divided into low density board (0.9 ~ 1.2 g / cm3), medium density board (1.2 ~ 1.5 g / cm3), high density board (1.5 ~ 2.0 g / cm3).
According to the forming pressure, it can be divided into non pressing plate and pressure plate.
According to the thickness, it can be divided into ultrathin plate (2.5 ~ 3.5mm) and conventional plate (4 ~ 12mm), thick plate (13 ~ 30mm), super thick plate (31 ~ 100mm).
3.1.2 Performance characteristics of fiber cement board
Fireproof insulation: it is non combustible class A. The board will not burn and produce toxic smoke in case of fire. The conductivity is low. So it is an ideal insulation material.
Waterproof and dampproof: in the open air and high humidity environment, it can still maintain the stability of performance.
Heat insulation and sound insulation: low thermal conductivity, good heat insulation performance, high product density and good sound insulation effect.
Light weight and high strength: high strength, not easy to deform and warp. Light weight, suitable for use in roof, ceiling and other parts.
Simple and simple construction method of keel and board. Deep processing products also have the characteristics of simple construction and excellent performance.
Good decoration effect: due to its light weight and convenient installation with keel, it can effectively reduce the engineering and decoration costs. At the same time, the board appearance color is uniform. The surface is flat and the use of water can make the building surface color uniform and beautiful.
Safe and harmless: the inspection indexes of harmful substances meet the requirements of national standard for radiological protection of building materials.
Long service life: acid and alkali resistance, corrosion resistance, not damaged by moisture or insects and ants. The strength and hardness increase with time. So it has an ultra long service life.
3.1.3 Main uses of fiber cement board
The application range of fiber cement board is very wide. Thin plate can be perforated, used as sound-absorbing ceiling material. Conventional board can be used as wall or decoration material, such as indoor (toilet) partition board, composite wall panel, outdoor billboard, metallurgical furnace heat insulation board, electrical power distribution cabinet, transformer partition board and other fields. Thick plate can be used as steel structure floor board, attic board, external wall insulation board, etc External wall hanging board, etc.
(To be continued)
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Post time: Aug-24-2020