Sodium Bromide (Industrial Grade) Appearance: white crysta Assay: ≥ 99% Chloride: ≤ 0.6% Sulfate: ≤ 200ppm Loss on drying: ≤ 3% Heavy metal: ≤ 5 ppm Arsen: ≤ 4 ppm Minor elements: ≤ 0.5ppm PH: 6.0--8.0