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Certificate of product analysis borax decahydrate (na2b4o710h2o) chemical specification content unit analysis purity % 99.9%min b2o3 % 36.47%min so4 ppm 70max cl ppm 50max fe ppm 50 max insoluble material % 0.1%min size distribution size(mm) unit content +1.200 % 4.00max -0.075 % 5.00max