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  • Types and uses of foundry sand
    Types and uses of foundry sand
    Foundry sand is divided into silica sand and non-siliceous sand according to different mineral compositions.
    2019-05-14
  • Visiting vietnamese customers
    Visiting vietnamese customers
    OBT is committed to providing investment casting materials and equipments for 16 years. We can also provide more service according to customer's design requirement.
    2019-04-17
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