ASTM B915-01

Standard Test Method for Measuring the Static Heat Resistance of a Self-Cleaning Oven Coating

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.

General Information

• Status: Historical
• Publication Date: 09-Mar-2001
• ICS: 97.040.20 - Cooking ranges, working tables, ovens and similar appliances
• Technical Committee: B08 - Metallic and Inorganic Coatings
• Drafting Committee: B08.12 - Materials for Porcelain Enamel and Ceramic-Metal Systems

Relations

• Replaced By: ASTM B915-01(2007) - Standard Test Method for Measuring Static Heat Resistance of Self-Cleaning Oven Coating
• Effective Date: 01-Mar-2007
• Referred By: ASTM C286-22 - Standard Terminology Relating to Porcelain Enamel and Ceramic-Metal Systems
• Effective Date: 10-Mar-2001

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Standard Test Method for
Measuring the Static Heat Resistance of a Self-Cleaning
Oven Coating
This standard is issued under the fixed designation B 915; 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 3.1.6 enamel breakdown, n—the point at which the glass
composite has disintegrated. Microscopic examination will
1.1 This test method covers the procedure for the qualitative
show loss of enamel bubble structure and devitrification of the
and quantitative evaluation of static heat effects on porcelain
enamel.This stage reveals metallic type elements derived from
enamel coatings.
the glass composition and the iron oxide from the steel
1.2 This test method is adaptable to various temperatures
substrate that has completely permeated the glass.
and times, since the requirements in the porcelain enameling
3.1.7 hazy appearance/scumming, adj—the glass will de-
industry differ between manufacturers.
velop an opaque film that exhibits low gloss on the surface of
1.3 This standard does not purport to address all of the
the porcelain enamel.
safety concerns, if any, associated with its use. It is the
3.1.8 metalizing, n—enamel on test plates will have a
responsibility of the user of this standard to establish appro-
reflective copper color from condensed metals in the enamel
priate safety and health practices and determine the applica-
that may increase with the deterioration of the glass during the
bility of regulatory limitations prior to use.
heat test cycle.
2. Referenced Documents
4. Significance and Use
2.1 ASTM Standards:
4.1 This test method is intended for testing the porcelain
D 523 Test Method for Specular Gloss
enamel finish on oven parts of self-cleaning ranges.
3. Terminology
4.2 The numerical values and visual evaluation derived by
this test method are used to measure differences in heat
3.1 Definitions of Terms Specific to This Standard:
resistant characteristics between enamel formulas intended to
3.1.1 blistering, n—a defect caused by gas evolution con-
meet oven manufacturer specifications.
sisting of a bubble that protrudes on the surface of the glass.
3.1.2 color and gloss change, n—this is determined by the
5. Apparatus
color and gloss delta values calculated between each heat test
5.1 Furnace, capable of holding a constant temperature of
cycle.
920°F (493°C) minimum.
3.1.3 copper heads/stickers, n—protrusions of iron oxide
5.2 Standing Bracket, approximately 10 by 10 by 6 in. (25.4
crystals permeated from the steel substrate or conglomerated
by 25.4 by 15.24 cm). Dimensions may vary according to test
metal components in the enamel.
plate size.
3.1.4 crazing, n—a defect appearing as one or more fine
5.3 Two Heavy-Gauge Steel Rods, approximately 12 in.
cracks in the porcelain enamel from thermal contraction and
(30.48 cm) long and ⁄8 in. (0.32 cm) in diameter.
expansion in the glass.
3 3
5.4 Standard Size ⁄8-16 or ⁄8-24 (0.96-cm) Nuts, used for
3.1.5 edge burn off, n—this may occur in the first 24 to 72
spacers between heat test plates.
h and appears as a thin dull discolored gray line around the
5.5 Spectrocolorimeter, capable of reading color by reflec-
entire edge of the test plate.
tion of enameled plates on reflectance 45°/0° and L*, a*, b*
color space. Equipment available for making color readings is
ThistestmethodisunderthejurisdictionofASTMCommitteeB08onMetallic
and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.12on
Materials for Porcelain Enamel and Ceramic-Metal Systems. L*,a*,b*colorspace:“Auniform-colorspaceusinganAdams-Nichersoncube
Current edition approved March 10, 2001. Published May 2001. root formula, suggested in 1974 for adaptation by the CIE (International Commis-
Annual Book of ASTM Standards, Vol 06.01. siononIllumination)in1976foruseinthemeasurementofsmallcolordifferences.”
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B915
an instrument that reads Spectrocolorimeter L, a, b scale such
24 h Gloss L a b
9-2-95
as Macbeth Color Eye or a Hunter Lab ColorQUEST.
Plate No. 1 89.3 +18.48 –.10 –1.50
5.6 Gloss Meter, capable of reading 60° ASTM gloss
measurements (see Test Method D 523). Delta at 24 D DL Da Db
h: Gloss
–1.1 –1.38 +.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
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
3 3
increase in redness, while a (–a) change in value would
5 ⁄8-by5 ⁄8-in. (13.65- by 13.65-cm) uncoated metal plate.
6.2 The metal plate is processed in the enamel formula that indicate an increase in green. Similarly, a (+b) change in value
would indicate an increase in yellowness, while a (–b) change
is to be subjected to static heat testing.
6.3 Before placing the test plate on heat test, initial color (L, in value would indicate an increase of blueness in the color
values of the test plate.
a, b) and gloss (60°) readings are recorded, dated, and
established as 0 h. 6.11 The plates are checked visually for enamel breakdown,
6.4 The enameled plate should be clean and free of any such as, metalizing, crazing, blistering, copperheading, hazy
fingerprints or smudges. To clean a soiled plate, a lint-free appearance, and edge burnoff, color, and gloss change.
papertoweldampenedwithalcoholisrubbedbackandforthon 6.12 Heat test plates that do not display any extreme
physical breakdown are returned to the 920°F (493°C) oven to
the surface until plate is clean. To prevent further smudging,
handle test plates on the edges. continue the heat test cycle.
6.13 Test plates are removed every
...