" The Original Ottawa Silica, " U.S. Silica' s testing sands are appropriate for hydraulic and masonry testing ( C-109) . They are available in graded and 20-30 grades, both conforming to ASTM C-778.
A CRM issued by NIST that also meets additional NIST-specific certification criteria and is issued with a certificate or certificate of analysis that reports the results of its characterizations and....