Asbestos and non-asbestos related technologies (1)
1. What is the difference between asbestos sealing material and non-asbestos sealing material? why?
Answer: 1. Asbestos sealing materials are more resistant to high temperature than non-asbestos sealing materials. The main components of asbestos sealing materials are asbestos, fillers and rubber, of which the temperature resistance of asbestos and fillers is very high; the main components of most non-asbestos sealing materials are mineral fibers, organic fibers, fillers and rubber, of which organic fibers are generally temperature-resistant At about 200 ℃, through scientific and technological research, the current maximum temperature resistance of the asbestos-free asbestos gasket has reached about 1000 ℃.
2. Asbestos sealing materials have higher mechanical strength than non-asbestos sealing materials.
(1) The surface of the asbestos fiber is attached with multivalent metal cations, which forms a strong interface with the negatively charged rubber on the surface, which improves the bonding strength of the rubber fiber, that is, the mechanical strength of the asbestos sealing material. The non-asbestos mineral fibers currently used are not as good as asbestos in direct affinity with the rubber matrix, so the bonding strength of rubber fibers is not as good as asbestos.
(2) Asbestos fibers can be subdivided almost indefinitely, and the specific surface area is larger than that of non-asbestos mineral fibers, so the enhancement effect is obvious.
(3) The tensile strength of asbestos fibers is higher than that of non-asbestos fibers, so the reinforcement effect of asbestos fibers is obvious.
3. The non-asbestos sealing material is more compact than the asbestos sealing material. Due to the high filler content and different particle size of the asbestos-free asbestos sealing material, the micro-gap of rubber fiber can be fully filled. For example, Bode Seal uses a high-precision material selection screen, and the precise screening of multiple raw materials is more uniform. In addition, the non-asbestos fiber does not have a tubular structure like the asbestos fiber, but a solid structure, so the compactness is better.
4. Asbestos-free sealing materials are environmentally friendly, and asbestos sealing materials are non-environmental friendly. Asbestos fibers contained in asbestos sealing materials are prone to cause silicosis in humans, and asbestos-free sealing materials do not contain asbestos fibers. It is worth noting that at present, there are very few domestic manufacturers of asbestos-free materials that can produce 100% asbestos-free materials like Shanghai Bode, so they must be carefully selected when purchasing.
5. As we all know, the seriousness of asbestos materials on human health has long been banned from the use of asbestos materials in developed countries such as Europe, America and Japan, and China will gradually phase out asbestos sealing materials and replace them with non-asbestos sealing materials.
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