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    Common materials used for heat insulation roof sheets include polyurethane, polystyrene, and fiberglass, each offering different levels of insulation and durability. The choice of material often depends on the specific climatic conditions, the building's design, and budget considerations.


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    The design of the oil seal is also an important factor in its performance. The seal must be able to effectively prevent fluid leakage while allowing for smooth movement of the shaft it is sealing. The design must also take into account factors such as pressure, temperature, and speed to ensure that the seal can operate effectively under all conditions
    oil
    oil seal standard.

    Oil seals come in various shapes to fit the machines and substances to be sealed.
    Figure 2 shows the structure and the names of the various components of the most typical oil seal.
    The functions of the various components are also indicated in Table 1.