ASTM B915-01(2017)
(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.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
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Designation: B915 − 01 (Reapproved 2017)
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.
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 3.1.1 blistering, n—a defect caused by gas evolution con-
sisting of a bubble that protrudes on the surface of the glass.
1.1 This test method covers the procedure for the qualitative
and quantitative evaluation of static heat effects on porcelain
3.1.2 color and gloss change, n—this is determined by the
enamel coatings. color and gloss delta values calculated between each heat test
cycle.
1.2 This test method is adaptable to various temperatures
and times, since the requirements in the porcelain enameling
3.1.3 copper heads/stickers, n—protrusions of iron oxide
industry differ between manufacturers.
crystals permeated from the steel substrate or conglomerated
metal components in the enamel.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1.4 crazing, n—a defect appearing as one or more fine
responsibility of the user of this standard to establish appro-
cracks in the porcelain enamel from thermal contraction and
priate safety and health practices and determine the applica-
expansion in the glass.
bility of regulatory limitations prior to use.
3.1.5 edge burn off, n—this may occur in the first 24 to 72
1.4 This international standard was developed in accor-
h and appears as a thin dull discolored gray line around the
dance with internationally recognized principles on standard-
entire edge of the test plate.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
3.1.6 enamel breakdown, n—the point at which the glass
mendations issued by the World Trade Organization Technical
composite has disintegrated. Microscopic examination will
Barriers to Trade (TBT) Committee.
show loss of enamel bubble structure and devitrification of the
enamel.This stage reveals metallic type elements derived from
2. Referenced Documents
the glass composition and the iron oxide from the steel
substrate that has completely permeated the glass.
2.1 ASTM Standards:
D523 Test Method for Specular Gloss
3.1.7 hazy appearance/scumming, adj—the glass will de-
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
that may increase with the deterioration of the glass during the
This test method is under the jurisdiction ofASTM Committee B08 on Metallic heat test cycle.
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.12 on
Materials for Porcelain Enamel and Ceramic-Metal Systems.
4. Significance and Use
Current edition approved May 1, 2017. Published May 2017. Originally
ɛ1
approved in 2001. Last previous edition approved in 2013 as B915 – 01 (2013) .
4.1 This test method is intended for testing the porcelain
DOI: 10.1520/B0915-01R17.
2 enamel finish on oven parts of self-cleaning ranges.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.2 The numerical values and visual evaluation derived by
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. this test method are used to measure differences in heat
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B915 − 01 (2017)
resistant characteristics between enamel formulas intended to testing may be used). Place cover plates on the two rods with
meet oven manufacturer specifications. enamel side towards test plates. The cover plates protect the
end heat test plates from being subjected to direct oven wall
5. Apparatus
heat.
5.1 Furnace, capable of holding a constant temperature of
6.8 The standing bracket containing the heat test plates is
920°F (493°C) minimum.
placed in a constant oven temperature of 920°F (493°C) for
360 h.
5.2 Standing Bracket, approximately 10 by 10 by 6 in. (25.4
by 25.4 by 15.24 cm). Dimensions may vary according to test
6.9 Thetestplatesareremovedfromtheovenafterevery24
plate size.
h, stand at room temperature and evaluated for the amount of
change in color, gloss, and physical appearance.
5.3 Two Heavy-Gauge Steel Rods, approximately 12 in.
(30.48 cm) long and ⁄8 in. (0.32 cm) in diameter.
6.10 The color and gloss readings of test plates are dated
3 3 and recorded after every 24 h of exposure to heat. Deltas are
5.4 Standard Size ⁄8 -16 or ⁄8 -24 (0.96-cm) Nuts, used for
calculated by measuring the gloss and color change from 0 to
spacers between heat test plates.
24 h as shown in example 1. With the final change from 0 to
5.5 Spectrocolorimeter, capable of reading color by reflec-
360 h or at failure, whichever occurs first.
tion of enameled plates on reflectance 45°/0° and L*, a*, b*
3 Example 1:
color space. Equipment available for making color readings is
0 h 9-1-95 Gloss L a b
an instrument that reads Spectrocolorimeter L, a, b scale such
Plate No. 1 90.4 +19.86 –0.23 –2.65
as Macbeth Color Eye or a Hunter Lab ColorQUEST.
24 h 9-2-95 Gloss L a b
Plate No. 1 89.3 +18.48 –0.10 –1.50
5.6 Gloss Meter, capable of reading 60° ASTM gloss
measurements (see Test Method D523).
Delta at 24 h: D Gloss DL Da Db
–1.1 –1.38 +0.13 +1.15
6. Procedure
6.10.1 The (+) and (–) values indicate the direction of
6.1 Punched holes are located ⁄4 in. (0.63 cm) down from
change, that is, a (+a) change in value would indicate an
the top and ⁄2 in. (1.2 cm) from the right and left sides on a
increase in redness, while a (–a) change in value would
3 3
5 ⁄8-by5 ⁄8-in. (13.65- by 13.65-cm) uncoated metal plate.
indicate an increase in green. Similarly, a (+b) change in value
would indicate an increase in yellowness, while a (–b
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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.
´1
Designation: B915 − 01 (Reapproved 2013) B915 − 01 (Reapproved 2017)
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
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.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D523 Test Method for Specular Gloss
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 blistering, n—a defect caused by gas evolution consisting of a bubble that protrudes on the surface of the glass.
3.1.2 color and gloss change, n—this is determined by the color and gloss delta values calculated between each heat test cycle.
3.1.3 copper heads/stickers, n—protrusions of iron oxide crystals permeated from the steel substrate or conglomerated metal
components in the enamel.
3.1.4 crazing, n—a defect appearing as one or more fine cracks in the porcelain enamel from thermal contraction and expansion
in the glass.
3.1.5 edge burn off, n—this may occur in the first 24 to 72 h and appears as a thin dull discolored gray line around the entire
edge of the test plate.
This test method is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee B08.12 on
Materials for Porcelain Enamel and Ceramic-Metal Systems.
Current edition approved May 1, 2013May 1, 2017. Published May 2013May 2017. Originally approved in 2001. Last previous edition approved in 20072013 as B915 – 01
ɛ1
(2007).(2013) . DOI: 10.1520/B0915-01R13E01.10.1520/B0915-01R17.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B915 − 01 (2017)
3.1.6 enamel breakdown, n—the point at which the glass composite has disintegrated. Microscopic examination will show loss
of enamel bubble structure and devitrification of the enamel. This stage reveals metallic type elements derived from the glass
composition and the iron oxide from the steel substrate that has completely permeated the glass.
3.1.7 hazy appearance/scumming, adj—the glass will develop an opaque film that exhibits low gloss on the surface of the
porcelain enamel.
3.1.8 metalizing, n—enamel on test plates will have a reflective copper color from condensed metals in the enamel that may
increase with the deterioration of the glass during the heat test cycle.
4. 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.
5. Apparatus
5.1 Furnace, capable of holding a constant temperature of 920°F (493°C) minimum.
5.2 Standing Bracket, approximately 10 by 10 by 6 in. (25.4 by 25.4 by 15.24 cm). Dimensions may vary according to test plate
size.
5.3 Two Heavy-Gauge Steel Rods, approximately 12 in. (30.48 cm) long and ⁄8 in. (0.32 cm) in diameter.
3 3
5.4 Standard Size ⁄8-16 or ⁄8-24 (0.96-cm) Nuts, used for spacers between heat test plates.
5.5 Spectrocolorimeter, capable of reading color by reflection of enameled plates on reflectance 45°/0° and L*, a*, b* color
3 4
space. Equipment available for making color readings is an instrument that reads Spectrocolorimeter L, a, b scale such as
Macbeth Color Eye or a Hunter Lab ColorQUEST.
5.6 Gloss Meter, capable of reading 60° ASTM gloss measurements (see Test Method D523).
6. Procedure
1 1 3
6.1 Punched holes are located ⁄4 in. (0.63 cm) down from the top and ⁄2 in. (1.2 cm) from the right and left sides on a 5 ⁄8-
by 5 ⁄8-in. (13.65- by 13.65-cm) uncoated metal plate.
6.2 The metal plate is processed in the enamel formula that is to be subjected to static heat testing.
6.3 Before placing the test plate on heat test, initial color (L, a, b) and gloss (60°) readings are recorded, dated, and established
as 0 h.
6.4 The enameled plate should be clean and free of any fingerprints or smudges. To clean a soiled plate, a lint-free paper towel
dampened with alcohol is rubbed back and forth on the surface until plate is clean. To prevent further smudging, handle test plates
on the edges.
6.5 A steel rod is passed through each hole of the test plate. The test plates are suspended across the top of the standing bracket
by the steel rods.
6.6 If more than one test plate is required, a spacer is placed on the rods between each test plate. This allows a ⁄4-in. (0.63-cm)
space between each test plate. Approximately 26 heat test plates can be suspended from the two steel rods.
6.7 A cover plate is placed on both ends of each row. The cover plate should be an enameled plate the same size as the heat
test plates (previous heat test plates no longer needed for testing may be used). Place co
...
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