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Contact SupplierBorax Pentahydrate serves as a source of Boron Oxide(B2O3) in many compositions, including insulation fiber glass, textile fiber glass and borosilicate glasses (heat resistant, illumination, cookware, medicalcosmetic containers, hollowsolid microspheres, optical lenses and sealing glass). It also provides a source of sodium, and is used in combination with boric acid where it is necessary to control the sodium to boron ratio in the glass.