ASTM B915-01(2007)
(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
This test method is intended for testing the porcelain enamel finish on oven parts of self-cleaning ranges.
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.
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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B915 − 01(Reapproved 2007)
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.
1. Scope 3.1.4 crazing, n—a defect appearing as one or more fine
cracks in the porcelain enamel from thermal contraction and
1.1 This test method covers the procedure for the qualitative
expansion in the glass.
and quantitative evaluation of static heat effects on porcelain
3.1.5 edge burn off, n—this may occur in the first 24 to 72
enamel coatings.
h and appears as a thin dull discolored gray line around the
1.2 This test method is adaptable to various temperatures
entire edge of the test plate.
and times, since the requirements in the porcelain enameling
3.1.6 enamel breakdown, n—the point at which the glass
industry differ between manufacturers.
composite has disintegrated. Microscopic examination will
1.3 This standard does not purport to address all of the
show loss of enamel bubble structure and devitrification of the
safety concerns, if any, associated with its use. It is the
enamel.This stage reveals metallic type elements derived from
responsibility of the user of this standard to establish appro-
the glass composition and the iron oxide from the steel
priate safety and health practices and determine the applica-
substrate that has completely permeated the glass.
bility of regulatory limitations prior to use.
3.1.7 hazy appearance/scumming, adj—the glass will de-
2. Referenced Documents
velop an opaque film that exhibits low gloss on the surface of
the porcelain enamel.
2.1 ASTM Standards:
D523 Test Method for Specular Gloss 3.1.8 metalizing, n—enamel on test plates will have a
reflective copper color from condensed metals in the enamel
3. Terminology
that may increase with the deterioration of the glass during the
heat test cycle.
3.1 Definitions of Terms Specific to This Standard:
3.1.1 blistering, n—a defect caused by gas evolution con-
4. Significance and Use
sisting of a bubble that protrudes on the surface of the glass.
4.1 This test method is intended for testing the porcelain
3.1.2 color and gloss change, n—this is determined by the
enamel finish on oven parts of self-cleaning ranges.
color and gloss delta values calculated between each heat test
cycle.
4.2 The numerical values and visual evaluation derived by
this test method are used to measure differences in heat
3.1.3 copper heads/stickers, n—protrusions of iron oxide
resistant characteristics between enamel formulas intended to
crystals permeated from the steel substrate or conglomerated
meet oven manufacturer specifications.
metal components in the enamel.
5. Apparatus
This test method is under the jurisdiction ofASTM Committee B08 on Metallic
5.1 Furnace, capable of holding a constant temperature of
and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.12 on
920°F (493°C) minimum.
Materials for Porcelain Enamel and Ceramic-Metal Systems.
Current edition approved March 1, 2007. Published March 2007. Originally
5.2 Standing Bracket, approximately 10 by 10 by 6 in. (25.4
approved in 2001. Last previous edition approved in 2001 as B915 – 01. DOI:
by 25.4 by 15.24 cm). Dimensions may vary according to test
10.1520/B0915-01R07.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or plate size.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.3 Two Heavy-Gauge Steel Rods , approximately 12 in.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. (30.48 cm) long and ⁄8 in. (0.32 cm) in diameter.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B915 − 01 (2007)
3 3
5.4 Standard Size ⁄8-16 or ⁄8-24 (0.96-cm) Nuts, used for 6.9 Thetestplatesareremovedfromtheovenafterevery24
spacers between heat test plates. h, stand at room temperature and evaluated for the amount of
change in color, gloss, and physical appearance.
5.5 Spectrocolorimeter, capable of reading color by reflec-
tion of enameled plates on reflectance 45°/0° and L*, a*, b*
6.10 The color and gloss readings of test plates are dated
color space. Equipment available for making color readings is
and recorded after every 24 h of exposure to heat. Deltas are
an instrument that reads Spectrocolorimeter L, a, b scale such
calculated by measuring the gloss and color change from 0 to
as Macbeth Color Eye or a Hunter Lab ColorQUEST.
24 h as shown in example 1. With the final change from 0 to
360 h or at failure, whichever occurs first.
5.6 Gloss Meter, capable of reading 60° ASTM gloss
Example 1:
measurements (see Test Method D523).
0 h 9-1-95 Gloss L a b
Plate No. 1 90.4 +19.86 –0.23 –2.65
6. Procedure
24 h 9-2-95 Gloss L a b
6.1 Punched holes are located ⁄4 in. (0.63 cm) down from
Plate No. 1 89.3 +18.48 –0.10 –1.50
the top and ⁄2 in. (1.2 cm) from the right and left sides on a
3 3
Delta at 24 h: D Gloss DL Da Db
5 ⁄8-by5 ⁄-in. (13.65- by 13.65-cm) uncoated metal plate.
–1.1 –1.38 +0.13 +1.15
6.2 The metal plate is processed in the enamel formula that
6.10.1 The (+) and (–) values indicate the direction of
is to be subjected to static heat testing.
change, that is, a (+a) change in value would indicate an
6.3 Before placing the test plate on heat test, initial color (L,
increase in redness, while a (–a) change in value would
a, b) and gloss (60°) readings are recorded, dated, and
indicate an increase in green. Similarly, a (+b) change in value
established as 0 h.
would indicate an increase in yellowness, while a (–b) change
in value would indicate an increase of blueness in the color
6.4 The enameled plate should be clean and free of any
values of the test plate.
fingerprints or smudges. To clean a soiled plate, a lint-free
papertoweldampenedwithalcoholisrubbedbackandforthon
6.11 The plates are checked visually for enamel
...
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