National Laboratory for Soil and Building Materials reported 71.47% gypsum purity by weight for the White House Gypsum powder sample it tested on 29 July 2026 using ASTM C 471. Report 2644010 was issued on 5 August 2026.
This result applies to the sample tested. Ask our team for documentation for the batch offered in your quotation.
White House packaging
A closer look at the blue and red White House Gypsum sacks. The bags shown are marked 20 kg.