ASTM C146 : 21

1.1 These test methods cover the chemical analysis of glass sands. They are useful for either high-silica sands (99 % + silica (SiO₂)) or for high-alumina sands containing as much as 12 to 13 % alumina (Al₂O₃). Generally nonclassical, these test methods are rapid and accurate. They include the determination of silica and of total R₂O₃  (see 11.2.4), and the separate determination of total iron as iron oxide (Fe₂O₃), titania (TiO₂), chromium oxide (Cr₂O₃), zirconia (ZrO₂), and ignition loss. Included are procedures for the alkaline earths and alkalies. High-alumina sands may contain as much as 5 to 6 % total alkalies and alkaline earths. It is recommended that the alkalies be determined by flame photometry and the alkaline earths by absorption spectrophotometry.

1.2 These test methods, if followed in detail, will provide interlaboratory agreement of results.

1.3 These test methods appear in the following order:

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.