The Material shall be in the form of crystalline powder with White Flakes or Powder, free from visible impurities. Purity as CaBr2, percent by mass : 95.0 (Minimum). Chloride as CaCl2, percent by mass : 3.0 (Maximum). Water Insoluble Matter, percent by mass : 0.03 (Maximum). Specific Gravity at 24 ± 2 °C : 3.30 (Minimum).