ASTM C169

ASTM C169 – Standard Test Methods for Chemical Analysis of Soda-Lime and Borosilicate Glass

Description:

Significance and Use

3.1 These test methods can be used to ensure that the chemical composition of the glass meets the compositional specification required for the finished glass product.

3.2 These test methods do not preclude the use of other methods that yield results within permissible variations. In any case, the analyst should verify the procedure and technique employed by means of a National Institute of Standards and Technology (NIST) standard reference material having a component comparable with that of the material under test. A list of standard reference materials is given in the NIST Special Publication 260,3 current edition.

3.3 Typical examples of products manufactured using soda-lime silicate glass are containers, tableware, and flat glass.

3.4 Typical examples of products manufactured using borosilicate glass are bakeware, labware, and fiberglass.

3.5 Typical examples of products manufactured using fluoride opal glass are containers, tableware, and decorative glassware.

Scope

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
	BaO, Al2O3, CaO, and MgO by Atomic Absorption; and      Na2O and K2O by Flame Emission Spectroscopy	52 – 59
	SO3 (Total Sulfur)	60
	B2O3	61 – 62
	Fluorine by Pyrohydrolysis Separation and Specific Ion      Electrode Measurement	63 – 66
	P2O5 by the Molybdo-Vanadate Method	67 – 70
	Colorimetric Determination of Ferrous Iron Using 1,10      Phenanthroline	71 – 76