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Sulfamic Acid Qingdao Century Minghui International Trade Co., Ltd. Sulfamic Acid is manufactured from urea, sulfur trioxide, and sulfuric acid. It appears as a white crystalline solid and is soluble and highly ionized in water. Sulfamic Acid is used in the manufacturing of paper and cardboard with the intent of being in ...展开 Sulfamic Acid is manufactured from urea, sulfur trioxide, and sulfuric acid. It appears as a white crystalline solid and is soluble and highly ionized in water. Sulfamic Acid is used in the manufacturing of paper and cardboard with the intent of being in contact with food items, and therefore it is FDA approved (GRAS) as an indirect food ingredient. 收起