Sakrete™ Sand Mix, High Strength, 60 lb, Bag, Gray, 40 to 90 deg F, 24 hr Setting Time, 24 hr Traffic Time, 0.45 cu-ft Yield, Composition: 20 to 80% Quartz, 30 to 60% Plaster of Paris, 10 to 30% Cement/Portland/Chemical, 3 to 7% Calcium Magnesium Hydroxide, 3 to 7% Calcium Magnesium Hydroxide Oxide, 1 to 5% Calcium Oxide, 1 to 5% Calcium Hydroxide, 1 to 5% Calcium Sulfate, 1 to 5% Limestone, 1 to 5% Iron Oxide, 1 to 5% Magnesium Oxide, 1 to 5% Magnesium Hydroxide, 12 to 13 pH