Standard Historical Last Updated: Dec 31, 2010
ASTM E2296-03

Standard Practice for Silver Corrections in Metal Bearing Ores, Concentrates, and Related Metallurgical Materials by Fire Assay Slag Recycling and Cupel Proof Gravimetry

Significance and Use

This practice is primarily intended to be used for the correction of silver loss in the fire assay process. Silver contents are determined by fire assay for the purpose of metallurgical exchange between buyer and seller. It is assumed that all who use this practice will be trained analysts capable of performing skillfully and safely. It is expected that work will be performed in a properly equipped laboratory under appropriate quality control practices such as those described in Guide E 882.

TABLE 1 Slag Re-Fusion Flux

litharge55.4 g
sodium carbonate9.3 g
silica sand9.4 g
potassium bitartrate7.3 g
borax18.7 g


1.1 This practice covers the silver loss correction, utilizing slag recycling and cupellation of proof silver during the fire assay of metal bearing ores, concentrates and related metallurgical materials.

1.2 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 and health practices and determine the applicability of regulatory limitations prior to use. (See Practices E 50 and ISO Guide 35.)

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Book of Standards Volume: 03.05
Developed by Subcommittee: E01.02
Pages: 3
DOI: 10.1520/E2296-03
ICS Code: 73.060.99