... Granule 90SF,93SF,95SF,97SF 20Kg Carton or Drum Vitamin C Ascorbic Acid DC granule(90%,93%,95%,97%) CAS No ... possible after open. Invalid period: two years under airtight condition. Specification:97% 95% 92% 25kg/barrel 1kg/barrelAscorbic Acid DC Granule ... or Drum[ Standard ]In-house Standard Ascorbic Acid DC Vitamin C Granule 90SF,93SF,95SF,97SF