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What is the difference between asbestos pads and non-asbestos pads without asbestos sealing materials?
1. What’s the difference between asbestos-containing sealing materials and asbestos-free ones? And why?
The key distinction lies in their temperature resistance and mechanical properties. Asbestos-containing sealing materials are superior in withstanding extreme heat compared to asbestos-free alternatives. This is because asbestos itself and the filler components in these materials possess excellent heat-resistant properties. In contrast, most asbestos-free materials rely on mineral fibers, organic fibers, and other additives. While some mineral fibers can endure temperatures up to 500°C, organic fibers typically cap out at around 200°C. However, through advanced research, certain brands like Bode have managed to push the temperature limits of asbestos-free gaskets close to 1000°C.
2. When it comes to mechanical strength, asbestos-containing sealing materials also outperform asbestos-free ones. This is due to the unique properties of asbestos fibers. Their surfaces naturally bond well with rubber thanks to polyvalent metal cations, creating a stronger interface. Non-asbestos fibers lack this natural affinity, resulting in weaker bonding. Additionally, asbestos fibers can be divided into finer strands, offering a greater specific surface area that enhances reinforcement. Their tensile strength is also notably higher, contributing to the overall robustness of asbestos-based materials.
3. Another notable difference is density. Asbestos-free sealing materials tend to be denser than their asbestos counterparts. This is because they incorporate a high concentration of diverse-sized fillers, which help to fill microscopic gaps within the composite. Brands like Bode achieve this through meticulous material selection and screening processes, ensuring uniformity and consistency in their products. Furthermore, unlike asbestos fibers, which have a tubular structure, asbestos-free fibers are solid, providing additional density benefits.
4. From an environmental perspective, asbestos-free sealing materials are clearly the better choice. Asbestos fibers in traditional materials pose significant health risks, potentially causing conditions like silicosis in humans. On the other hand, asbestos-free materials eliminate this hazard entirely. It's worth noting that only a handful of manufacturers, including Bode, can produce 100% asbestos-free products. Consumers should exercise caution and verify product authenticity before purchase.
5. Globally, many developed nations such as those in Europe, the U.S., and Japan have long since banned asbestos materials due to their severe health implications. China is following suit, gradually phasing out asbestos-containing sealing materials in favor of safer, asbestos-free alternatives. This shift underscores the growing awareness and commitment to public health and environmental sustainability.