Standard Specification for High Purity Calcium Sulfate Hemihydrate or Dihydrate for Surgical Implants1. Scope 1. 1 This specification covers material requirements for unfabricated and fabricated forms of hydrated calcium sulfate intended for surgical implants. Fabricated forms may include pressed and cast surgical implants in various geometric shapes. The calcium sulfate hemihydrate in the unfabricated form can be converted with the addition of water or other watercontaining solutions to a fabricated calcium sulfate dihydrate form.

tram and trolley bus systems

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