Benzoyl sulfonyl imide, commonly known as saccharin. White crystalline powder. The mass fraction of phthalimide is ≥99.0% heavy metal (calculated as Pb) ≤10×/kloc-0-6 alkalinity ≤ 15% arsenic salt (calculated as As) ≤2× 10-6 loss on drying ≤0.003% ammonium salt.