ASTM B915-01(2013)e1
(Test Method)Standard Test Method for Measuring Static Heat Resistance of Self-Cleaning Oven Coating
Standard Test Method for Measuring Static Heat Resistance of Self-Cleaning Oven Coating
SIGNIFICANCE AND USE
4.1 This test method is intended for testing the porcelain enamel finish on oven parts of self-cleaning ranges.
4.2 The numerical values and visual evaluation derived by this test method are used to measure differences in heat resistant characteristics between enamel formulas intended to meet oven manufacturer specifications.
SCOPE
1.1 This test method covers the procedure for the qualitative and quantitative evaluation of static heat effects on porcelain enamel coatings.
1.2 This test method is adaptable to various temperatures and times, since the requirements in the porcelain enameling industry differ between manufacturers.
1.3 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.
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Standards Content (Sample)
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Designation: B915 − 01 (Reapproved 2013)
Standard Test Method for
Measuring Static Heat Resistance of Self-Cleaning Oven
Coating
This standard is issued under the fixed designation B915; 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.
ε NOTE—Abstract was added editorially in May 2013.
INTRODUCTION
The purpose of this test is to qualitatively and quantitatively determine the resistance of a porcelain
enamel to thermal conditions encountered in pyrolytic self-cleaning oven in an accelerated laboratory
evaluation.
1. Scope 3.1.3 copper heads/stickers, n—protrusions of iron oxide
crystals permeated from the steel substrate or conglomerated
1.1 Thistestmethodcoverstheprocedureforthequalitative
metal components in the enamel.
and quantitative evaluation of static heat effects on porcelain
3.1.4 crazing, n—a defect appearing as one or more fine
enamel coatings.
cracks in the porcelain enamel from thermal contraction and
1.2 This test method is adaptable to various temperatures
expansion in the glass.
and times, since the requirements in the porcelain enameling
3.1.5 edge burn off, n—this may occur in the first 24 to 72
industry differ between manufacturers.
h and appears as a thin dull discolored gray line around the
1.3 This standard does not purport to address all of the
entire edge of the test plate.
safety concerns, if any, associated with its use. It is the
3.1.6 enamel breakdown, n—the point at which the glass
responsibility of the user of this standard to establish appro-
composite has disintegrated. Microscopic examination will
priate safety and health practices and determine the applica-
show loss of enamel bubble structure and devitrification of the
bility of regulatory limitations prior to use.
enamel.This stage reveals metallic type elements derived from
the glass composition and the iron oxide from the steel
2. Referenced Documents
2 substrate that has completely permeated the glass.
2.1 ASTM Standards:
3.1.7 hazy appearance/scumming, adj—the glass will de-
D523 Test Method for Specular Gloss
velop an opaque film that exhibits low gloss on the surface of
3. Terminology the porcelain enamel.
3.1 Definitions of Terms Specific to This Standard: 3.1.8 metalizing, n—enamel on test plates will have a
reflective copper color from condensed metals in the enamel
3.1.1 blistering, n—a defect caused by gas evolution con-
sisting of a bubble that protrudes on the surface of the glass. that may increase with the deterioration of the glass during the
heat test cycle.
3.1.2 color and gloss change, n—this is determined by the
color and gloss delta values calculated between each heat test
4. Significance and Use
cycle.
4.1 This test method is intended for testing the porcelain
enamel finish on oven parts of self-cleaning ranges.
ThistestmethodisunderthejurisdictionofASTMCommitteeB08onMetallic
4.2 The numerical values and visual evaluation derived by
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.12 on
this test method are used to measure differences in heat
Materials for Porcelain Enamel and Ceramic-Metal Systems.
resistant characteristics between enamel formulas intended to
Current edition approved May 1, 2013. Published May 2013. Originally
approved in 2001. Last previous edition approved in 2007 as B915 – 01 (2007). meet oven manufacturer specifications.
DOI: 10.1520/B0915-01R13E01.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 5. Apparatus
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1 Furnace, capable of holding a constant temperature of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 920°F (493°C) minimum.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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B915 − 01 (2013)
5.2 Standing Bracket, approximately 10 by 10 by 6 in. (25.4 6.8 The standing bracket containing the heat test plates is
by 25.4 by 15.24 cm). Dimensions may vary according to test placed in a constant oven temperature of 920°F (493°C) for
plate size. 360 h.
6.9 Thetestplatesareremovedfromtheovenafterevery24
5.3 Two Heavy-Gauge Steel Rods, approximately 12 in.
h, stand at room temperature and evaluated for the amount of
(30.48 cm) long and ⁄8 in. (0.32 cm) in diameter.
change in color, gloss, and physical appearance.
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5.4 Standard Size ⁄8 -16 or ⁄8 -24 (0.96-cm) Nuts, used for
6.10 The color and gloss readings of test plates are dated
spacers between heat test plates.
and recorded after every 24 h of exposure to heat. Deltas are
5.5 Spectrocolorimeter, capable of reading color by reflec-
calculated by measuring the gloss and color change from 0 to
tion of enameled plates on reflectance 45°/0° and L*, a*, b*
24 h as shown in example 1. With the final change from 0 to
color space. Equipment available for making color readings is
360 h or at failure, whichever occurs first.
an instrument that reads Spectrocolorimeter L, a, b scale such
Example 1:
as Macbeth Color Eye or a Hunter Lab ColorQUEST.
0 h 9-1-95 Gloss L a b
Plate No. 1 90.4 +19.86 –0.23 –2.65
5.6 Gloss Meter, capable of reading 60° ASTM gloss
24 h 9-2-95 Gloss L a b
measurements (see Test Method D523).
Plate No. 1 89.3 +18.48 –0.10 –1.50
6. Procedure
Delta at 24 h: D Gloss DL Da Db
–1.1 –1.38 +0.13 +1.15
6.1 Punched holes are located ⁄4 in. (0.63 cm) down from
6.10.1 The (+) and (–) values indicate the direction of
the top and ⁄2 in. (1.2 cm) from the right and left sides on a
change, that is, a (+a) change in value would indicate an
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5 ⁄8-by5 ⁄8-in. (13.65- by 13.65-cm) uncoated metal plate.
increase in redness, while a (–a) change in value would
6.2 The metal plate is processed in the enamel formula that
indicate an increase in green. Similarly, a (+b) change in value
is to be subjected to static heat testing.
would indicate an increase in yellowness, while a (–b) change
in value would indicate an increase of blueness in the color
6.3 Before placing the test plate on heat test, initial color (L,
values of the test plate.
a, b) and gloss (60°) read
...
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