ASTM C1203-04(2009)

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:C1203–91(Reapproved 1996) Designation:C1203–04 (Reapproved 2009)
Standard Test Method for
Quantitative Determination of Alkali Resistance of a
Ceramic-Glass Enamel
This standard is issued under the fixed designation C 1203; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers the determination of the resistance of a fired ceramic-glass enamel to a 10 % alkali solution held
near its boiling point for 2 h.
1.2 This test method is not applicable to large tempered glass sheets or specimens larger than 9 by 9 cm.
1.3
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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 and health practices and determine the applicability of regulatory
limitations prior to use. For specific hazard statements, see Section 9.
2. Referenced Documents
2.1 ASTM Standards:
C 162 Terminology of Glass and Glass Products
C 927 Test Method for Lead and Cadmium Extracted from the Lip and RimArea of GlassTumblers Externally Decorated with
Ceramic Glass Enamels Test Method for Lead and Cadmium Extracted from the Lip and Rim Area of Glass Tumblers
Externally Decorated with Ceramic Glass Enamels
E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions—For additional definitions of terms refer to Terminology C 162.
3.1.1 ceramic glass enamels (also glass enamels or ceramic enamels)—predominantly colored, silicate-glass fluxes used to
decorate glassware. C 927
3.1.2 maturity—of a fired ceramic glass enamel,aceramicglassenamelhasbeenfiredtomaturitywhenporosityoftheceramic
glassenamelhasbeensubstantiallyeliminated,andtheexpectedsurfaceglossofthefiredceramicglassenamelhasbeenachieved.
3.1.2.1 Discussion—Refer to GTA Engineering Standards Manual, Section 4, D.3.3.1 and D.3.4.1, for testing criteria for
maturity.
4. Summary of Test Method
4.1 This test method measures the weight loss of a glass specimen decorated with a fired ceramic-glass enamel, when
completely immersed in a 10 % alkali solution near its boiling point. A stainless steel beaker containing test samples and a 10 %
alkali solution is heated at 95°C in a temperature controlled water bath for 2 h. Chemical dissolution of the ceramic-glass-enamel
coatingaswellasanylossofweightduetothedissolutionofthesubstrateismeasuredbydeterminingweightlossofthespecimen
after exposure to the hot alkali solution.Asubstrate without ceramic-glass enamel is tested to determine the expected weight loss
due to dissolution of the nondecorated side of the substrate.
5. Significance and Use
5.1 This test method is intended to be used when a quantitative measurement of the alkali durability of a ceramic-glass enamel
is needed. The test is applicable to glass coated with fired enamels where exposure to strong alkalis, or alkalis at elevated
This test method is under the jurisdiction ofASTM Committee C-14 C14 on Glass and Glass Products and is the direct responsibility of Subcommittee C14.10 on Glass
Decoration.
Current edition approved Nov. 15, 1991. Published January 1992.
Current edition approved May 1, 2009. Published September 2009. Originally approved in 1991. Last previous edition approved in 2004 as C 1203 – 04.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
, Vol 15.02.volume information, refer to the standard’s Document Summary page on the ASTM website.
GTA Engineering Standards Manual, Glass Tempering Association, Topeka, KS, 1992.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C1203–04 (2009)
temperatures might be encountered in service.
5.2 This test method is intended to be an accelerated, destructive test. Results can be used as an indicator of the relative
durability of a particular enamel.
6. Interferences
6.1 The extent to which an enamel has been fired to maturity, as well as the residual stresses remaining after annealing of test
specimen, can influence results.
6.2 Tests performed on tempered or heat-strengthened production ware should be done by annealing the chosen sheet before
cutting the specimen.
7. Apparatus
7.1 Balance or Scale, accurate to 0.1 g, to weigh reagents.
7.2 Balance, accurate to 0.1 mg, to weigh specimens.
7.3 Waterbath, temperature controlled, capable of holding 95 6 3°C.
7.4 Glass Marking Scribe.
7.5 Beaker, stainless steel, 1200-mL, with no pouring lip, as shown in Fig. 1.
7.6 Cover, stainless steel, for beaker.
7.7 Sample Holder, as shown in Fig. 1.
7.8 Tongs, heavy duty.
7.9 Rubber Gloves, chemically resistant.
7.10 Apron or Lab Coat, chemically resistant.
7.11 Face Shield.
7.12 Fume Hood, for ventilation.
7.13 Cloth, soft cotton.
7.14 Caliper, micrometer, accurate to 0.1 mm.
7.15 Oven, drying, capable of heating samples at 65 6 5°C.
8. Reagents and Materials
8.1 Alkali Solution—Dissolve 70 g of sodium hydroxide (NaOH) in 630 mL of distilled water.
9. Hazards
9.1 Refer to the manufacturer’s Material Safety Data Sheets for information regarding these materials.
FIG. 1 Stainless Steel Beaker and Sample Holder
C1203–04 (2009)
9.2 A proper fume hood should be used when handling hot caustic solutions. Chemically resistant gloves, eye protection, and
clothing should be worn, and tongs should be used. If accidental contact with caustic is encountered, or if ingestion occurs, seek
medical attention immediately.
10. Test Specimen
10.1 The specimen to be tested should be glass decorated with ceramic g
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