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What is the difference between asbestos pads and non-asbestos pads without asbestos sealing materials?
1. What sets asbestos sealing materials apart from asbestos-free sealing materials? Primarily, asbestos sealing materials boast superior heat resistance compared to asbestos-free alternatives. This is due to their composition, which includes asbestos, fillers, and rubber. Asbestos and fillers within these materials possess excellent heat-resistant properties. On the other hand, asbestos-free sealing materials typically consist of mineral fibers, organic fibers, fillers, and rubber. Organic fibers, however, usually have a temperature limit of around 200°C. Through extensive research, some brands like Bode have managed to push the temperature resistance of asbestos gaskets up to approximately 1000°C.
2. When it comes to mechanical strength, asbestos sealing materials also outperform asbestos-free ones. This is because asbestos fibers naturally bond well with rubber due to their polyvalent metal cations, creating a strong interface that enhances the material's overall strength. In contrast, the bonding between non-asbestos fibers and rubber isn't as effective. Additionally, asbestos fibers can be divided into finer strands, offering a greater specific surface area, which significantly boosts their reinforcing capabilities. Furthermore, the tensile strength of asbestos fibers surpasses that of non-asbestos fibers, contributing to their superior mechanical performance.
3. Another distinction lies in density. Asbestos-free sealing materials tend to be denser than their asbestos counterparts. This is largely attributed to the high filler content in asbestos-free materials, along with the varying particle sizes that allow for better filling of micro-gaps within the composite. For instance, Bode Sealing employs precise material selection techniques and advanced screening processes to ensure uniformity in their products. Moreover, unlike asbestos fibers, which have a tubular structure, asbestos-free fibers are solid, enhancing their density and overall integrity.
4. From an environmental perspective, asbestos-free sealing materials are clearly the better choice. Asbestos fibers found in traditional sealing materials pose significant health risks, including causing silicosis in humans. Asbestos-free materials, free from these harmful fibers, offer a safer alternative. However, it’s important to note that producing entirely asbestos-free materials is challenging, and only a handful of companies globally, such as Shangcai Bode, achieve this standard. Thus, careful scrutiny is essential when selecting products.
5. The hazardous nature of asbestos materials has long been recognized, leading to bans in many developed regions like Europe, the U.S., and Japan. While China is progressively phasing out asbestos sealing materials, the shift toward asbestos-free options remains ongoing. This transition underscores a growing awareness of both environmental sustainability and public health safety.