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1. How does asbestos-containing sealing material differ from asbestos-free sealing material? And why?
The key difference lies in their temperature resistance. Asbestos sealing materials are designed to withstand much higher temperatures compared to most asbestos-free alternatives. This is because asbestos sealing materials primarily consist of asbestos, fillers, and rubber, where asbestos and certain fillers possess excellent heat resistance. On the other hand, many asbestos-free sealing materials are made up of mineral fibers, organic fibers, fillers, and rubber. Organic fibers, however, typically have a temperature resistance limit of around 200°C. Notably, advanced asbestos gaskets from brands like Bode can achieve temperature resistance of up to approximately 1000°C through extensive research and development.
2. Asbestos sealing materials also outperform asbestos-free ones in terms of mechanical strength.
This advantage stems from several factors. First, asbestos fibers carry polyvalent metal cations on their surfaces, which bond strongly with negatively charged rubber, enhancing the overall strength of the seal. Unfortunately, the affinity between non-asbestos fibers and rubber is weaker by comparison. Second, asbestos fibers can be divided into extremely fine strands, resulting in a larger surface area, which significantly enhances their reinforcing capabilities. Lastly, asbestos fibers themselves exhibit higher tensile strength than non-asbestos fibers, further boosting their reinforcing effects.
3. Another distinction is the density of these materials. Asbestos-free sealing materials tend to be denser than asbestos-based ones. This is due to the high filler content and varied particle sizes in Bode’s asbestos-free products, which help fill microscopic gaps between fibers. For instance, Bode Sealing employs precise material screening techniques to ensure uniformity in its raw materials. Additionally, unlike asbestos fibers, which have a tubular structure, asbestos-free fibers are solid, contributing to their superior density.
4. Environmental considerations also play a critical role. Asbestos-free sealing materials are eco-friendly, whereas asbestos-containing materials are not. Asbestos fibers in traditional sealing materials pose significant health risks, including the potential to cause silicosis in humans. Conversely, asbestos-free materials do not contain these harmful fibers. It’s important to note that only a handful of manufacturers in China, such as Shangcai Bode, produce 100% asbestos-free materials, so buyers should exercise caution when making purchases.
5. Globally, the dangers associated with asbestos materials have led to bans in regions like Europe, the U.S., and Japan. Over time, China will follow suit by phasing out asbestos sealing materials in favor of safer alternatives. This shift underscores the growing awareness of public health concerns linked to asbestos use.
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Hydraulic box girder, where the main beam includes a beam in the shape of a hollow box. The box girder usually includes any prestressed concrete, structural steel, or composite material, and reinforced concrete. The box is usually rectangular or trapezoidal in cross section. Box girder bridges are usually used for modern elevated structure transportation of highway overpasses and light rails. Although box girder bridges are usually a form of girder bridge, box girder can also be used in cable-stayed bridges and other forms.
Hydraulic Box Girder,Highway Formwork,Hydraulic Mould System,Hydraulic Box Girder Formwork
Anshan Lijian Engineering Group Co. LTD , https://www.lijianformwork.com