... Granule 90SF,93SF,95SF,97SF 20Kg Carton or Drum Vitamin C Ascorbic Acid DC granule(90%,93%,95%,97%) CAS No ... away from light and used as soon as possible after open. Invalid period: two years under airtight condition. Specification:97% 95 ... or Drum[ Standard ]In-house Standard Ascorbic Acid DC Vitamin C Granule 90SF,93SF,95SF,97SF