ASTM C1203-91(1996)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 1203 – 91 (Reapproved 1996)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope specimen decorated with a fired ceramic-glass enamel, when
completely immersed in a 10 % alkali solution near its boiling
1.1 This test method covers the determination of the resis-
point. A stainless steel beaker containing test samples and a
tance of a fired ceramic-glass enamel to a 10 % alkali solution
10 % alkali solution is heated at 95°C in a temperature
held near its boiling point for 2 h.
controlled water bath for 2 h. Chemical dissolution of the
1.2 This test method is not applicable to large tempered
ceramic-glass-enamel coating as well as any loss of weight due
glass sheets or specimens larger than 9 by 9 cm.
to the dissolution of the substrate is measured by determining
1.3 This standard does not purport to address all of the
weight loss of the specimen after exposure to the hot alkali
safety concerns, if any, associated with its use. It is the
solution. A substrate without ceramic-glass enamel is tested to
responsibility of the user of this standard to establish appro-
determine the expected weight loss due to dissolution of the
priate safety and health practices and determine the applica-
nondecorated side of the substrate.
bility of regulatory limitations prior to use. For specific hazard
statements, see Section 9.
5. Significance and Use
2. Referenced Documents 5.1 This test method is intended to be used when a quanti-
tative measurement of the alkali durability of a ceramic-glass
2.1 ASTM Standards:
enamel is needed. The test is applicable to glass coated with
C 162 Terminology of Glass and Glass Products
fired enamels where exposure to strong alkalis, or alkalis at
C 927 Test Method for Lead and Cadmium Extracted from
elevated temperatures might be encountered in service.
the Lip and Rim Area of Glass Tumblers Externally
5.2 This test method is intended to be an accelerated,
Decorated with Ceramic Glass Enamels
destructive test. Results can be used as an indicator of the
3. Terminology relative durability of a particular enamel.
3.1 Definitions—For additional definitions of terms refer to
6. Interferences
Terminology C 162.
6.1 The extent to which an enamel has been fired to
3.1.1 ceramic glass enamels (also glass enamels or ceramic
maturity, as well as the residual stresses remaining after
enamels)—predominantly colored, silicate-glass fluxes used to
annealing of test specimen, can influence results.
decorate glassware. C 927
6.2 Tests performed on tempered or heat-strengthened pro-
3.1.2 maturity—of a fired ceramic glass enamel, a ceramic
duction ware should be done by annealing the chosen sheet
glass enamel has been fired to maturity when porosity of the
before cutting the specimen.
ceramic glass enamel has been substantially eliminated, and
the expected surface gloss of the fired ceramic glass enamel has
7. Apparatus
been achieved.
7.1 Balance or Scale, accurate to 0.1 g, to weigh reagents.
3.1.2.1 Discussion—Refer to GTA Engineering Standards
7.2 Balance, accurate to 0.1 mg, to weigh specimens.
Manual, Section 4, D.3.3.1 and D.3.4.1, for testing criteria for
3 7.3 Waterbath, temperature controlled, capable of holding
maturity.
95 6 3°C.
4. Summary of Test Method 7.4 Glass Marking Scribe.
7.5 Beaker, stainless steel, 1200-mL, with no pouring lip, as
4.1 This test method measures the weight loss of a glass
shown in Fig. 1.
7.6 Cover, stainless steel, for beaker.
This test method is under the jurisdiction of ASTM Committee C-14 on Glass
7.7 Sample Holder, as shown in Fig. 1.
and Glass Products and is the direct responsibility of Subcommittee C14.10 on
7.8 Tongs, heavy duty.
Glass Decoration.
Current edition approved Nov. 15, 1991. Published January 1992.
7.9 Rubber Gloves, chemically resistant.
Annual Book of ASTM Standards, Vol 15.02.
7.10 Apron or Lab Coat, chemically resistant.
GTA Engineering Standards Manual, Glass Tempering Association, Topeka,
7.11 Face Shield.
KS, 1992.
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C 1203
10.4 Mark the sample with a glass marking scribe for
identification.
11. Procedure
11.1 Measure and record the length, width, and depth of
each specimen to the nearest 0.1 mm. Record the initial weight
of each specimen to the nearest 0.1 mg.
11.2 Place the specimens prepared as described in 10.1-
10.4, in a sample holder such as shown in Fig. 1 so that the
specimens are upright and separated from each other.
11.3 Prepare the alkali solution, as described in 8.1, in a
1200-mL stainless steel beaker with no pouring lip. This
volume of solution is adequate for testing a maximum
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