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Hebei Hankai hydraulic oil seal manufacturers

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    Fiberglass

    The materials used for manhole steps are chosen carefully. Traditionally, cast iron has been the go-to material due to its durability and strength. However, modern alternatives such as fiberglass-reinforced plastic are gaining popularity. These materials can offer advantages such as corrosion resistance and lighter weight, which can be particularly useful in areas with high moisture levels or corrosive environments.