ASTM C169-16

1.1 These test methods cover the quantitative chemical analysis of soda-lime and borosilicate glass compositions for both referee and routine analysis. This would be for the usual constituents present in glasses of the following types: (1) soda-lime silicate glass, (2) soda-lime fluoride opal glass, and (3) borosilicate glass. The following common oxides, when present in concentrations greater than indicated, are known to interfere with some of the determinations in this method: 2 % barium oxide (BaO), 0.2 % phosphorous pentoxide (P₂O₅), 0.05 % zinc oxide (ZnO), 0.05 % antimony oxide (Sb₂O₃), 0.05 % lead oxide (PbO).

1.2 The analytical procedures, divided into two general groups, those for referee analysis, and those for routine analysis, appear in the following order:

		Sections
Procedures for Referee Analysis:
	Silica	10
	BaO, R2O2 (Al2O3 + P2O5), CaO, and MgO	11 - 15
	Fe2O3, TiO2, ZrO2 by Photometry and Al2O3 by Com-      plexiometric Titration	16 - 22
	Cr2O3 by Volumetric and Photometric Methods	23 - 25
	MnO by the Periodate Oxidation Method	26 - 29
	Na2O by the Zinc Uranyl Acetate Method and K2O by      the Tetraphenylborate Method	30 - 33
	SO3 (Total Sulfur)	34 - 35
	As2O3 by Volumetric Method	36 - 40
Procedures for Routine Analysis:
	Silica by the Single Dehydration Method	42 - 44
	Al2O3, CaO, and MgO by Complexiometric Titration,      and BaO, Na2O, and K2O by Gravimetric Method	45 - 51
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