ASTM C632-88(2016)

Standard Test Method for Reboiling Tendency of Sheet Steel for Porcelain Enameling

SIGNIFICANCE AND USE
5.1 The results of this test indicate whether or not a sheet steel will cause reboiling under one given set of enameling conditions and enable the enamel processor to establish a possible source of imperfections in the finished coating.  
5.2 This test method is normally used to test samples from lots, coils, or lifts of sheet steel which for some reason, production problems, defects evident on enameled parts, or production experience are suspected of causing defects in enameled ware which have the appearance of reboiling. It is often used to establish whether a problem exists with the bare steel or other factors such as the porcelain enamel, processing contamination, and so forth.
SCOPE
1.1 This test method covers the determination of whether a sheet steel for porcelain enameling will reboil under a given set of worse case conditions.  
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.  
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: 31-Oct-2016
• ICS: 25.220.50 - Enamels
• Technical Committee: B08 - Metallic and Inorganic Coatings
• Drafting Committee: B08.12 - Materials for Porcelain Enamel and Ceramic-Metal Systems

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C632 − 88 (Reapproved 2016)
Standard Test Method for
Reboiling Tendency of Sheet Steel for Porcelain Enameling
This standard is issued under the fixed designation C632; 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 results of this test indicate whether or not a sheet steel will cause reboiling under one given set
of enameling conditions, and enable the enamel processor to establish a possible cause of
imperfections in the finished coating. This may be performed in any laboratory equipped for porcelain
enamel. It does not require facilities for metal surface preparation.
1. Scope 3.1.3 slip (slurry)— a suspension of finely divided material
in liquid (see Terminology C286).
1.1 This test method covers the determination of whether a
sheet steel for porcelain enameling will reboil under a given set 3.2 Definitions of Terms Specific to This Standard:
of worse case conditions. 3.2.1 quarter lines—imaginary lines parallel to the direction
of rolling positioned at a distance from the sheet mill edge,
1.2 The values stated in inch-pound units are to be regarded
equal to one quarter of the sheet width.
as the standard. The values given in parentheses are for
information only.
4. Summary of Test Method
1.3 This standard does not purport to address all of the
4.1 Both surfaces of sheet steel sample plates are subjected
safety concerns, if any, associated with its use. It is the
to a cleaning treatment and are then porcelain enameled with a
responsibility of the user of this standard to establish appro-
sheet-steel, ground-coat type finish. Subsequent reheating at
priate safety and health practices and determine the applica-
various times is performed to reveal whether or not the steel
bility of regulatory limitations prior to use.
will cause reboiling. The presence or absence of reboiling is
determined by visual inspection.
2. Referenced Documents
5. Significance and Use
2.1 ASTM Standards:
C286 Terminology Relating to Porcelain Enamel and
5.1 The results of this test indicate whether or not a sheet
Ceramic-Metal Systems
steel will cause reboiling under one given set of enameling
conditions and enable the enamel processor to establish a
3. Terminology
possible source of imperfections in the finished coating.
3.1 Definitions:
5.2 This test method is normally used to test samples from
3.1.1 ground coat—a porcelain enamel applied directly to
lots, coils, or lifts of sheet steel which for some reason,
the base metal to function as an intermediate layer between the
production problems, defects evident on enameled parts, or
metal and the cover coat (see Terminology C286).
production experience are suspected of causing defects in
enameled ware which have the appearance of reboiling. It is
3.1.2 reboiling—gas evolution occurring and recurring dur-
ing repeated firing of the ground coat, sometimes a defect (see often used to establish whether a problem exists with the bare
steel or other factors such as the porcelain enamel, processing
Terminology C286).
contamination, and so forth.
1 6. Apparatus
This test method is under the jurisdiction ofASTM Committee B08 on Metallic
and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.12 on
6.1 This test can be conducted in any laboratory equipped
Materials for Porcelain Enamel and Ceramic-Metal Systems.
for general porcelain enameling. It does not require facilities
Current edition approved Nov. 1, 2016. Published November 2016. Originally
approved in 1969. Last previous edition approved in 2011 as C632 – 88 (2011). for metal surface preparation.
DOI: 10.1520/C0632-88R16.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7. Reagents and Materials
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
7.1 Steel Sheet, sufficient in size to provide samples as
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. described in 8.1 and 8.1.1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C632 − 88 (2016)
NOTE 1—Thin fired coatings of 2 ⁄2 to 3 mils (0.06 to 0.08 mm) are
7.2 Porcelain-Enamel, Ground-Coat Slip, obtained from
desirable so that reboil bubbles can be readily observed.
production milling or prepared in laboratory facilities.
9.3 Store the fired panels at room temperature for at least 16
7.3 Acetone or Isopropyl Alcohol, reagent grade.
h, but not more than 48 h, prior
...

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: C632 − 88 (Reapproved 2011) C632 − 88 (Reapproved 2016)
Standard Test Method for
Reboiling Tendency of Sheet Steel for Porcelain Enameling
This standard is issued under the fixed designation C632; 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—Test Method was corrected editorially in 2011
INTRODUCTION
The results of this test indicate whether or not a sheet steel will cause reboiling under one given set
of enameling conditions, and enable the enamel processor to establish a possible cause of
imperfections in the finished coating. This may be performed in any laboratory equipped for porcelain
enamel. It does not require facilities for metal surface preparation.
1. Scope
1.1 This test method covers the determination of whether a sheet steel for porcelain enameling will reboil under a given set of
worse case conditions.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information
only.
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.
2. Referenced Documents
2.1 ASTM Standards:
C286 Terminology Relating to Porcelain Enamel and Ceramic-Metal Systems
3. Terminology
3.1 Definitions:
3.1.1 ground coat—a porcelain enamel applied directly to the base metal to function as an intermediate layer between the metal
and the cover coat (see Terminology C286).
3.1.2 reboiling—gas evolution occurring and recurring during repeated firing of the ground coat, sometimes a defect (see
Terminology C286).
3.1.3 slip (slurry)— a suspension of finely divided material in liquid (see Terminology C286).
3.2 Definitions of Terms Specific to This Standard:
3.2.1 quarter lines—imaginary lines parallel to the direction of rolling positioned at a distance from the sheet mill edge, equal
to one quarter of the sheet width.
4. Summary of Test Method
4.1 Both surfaces of sheet steel sample plates are subjected to a cleaning treatment and are then porcelain enameled with a
sheet-steel, ground-coat type finish. Subsequent reheating at various times is performed to reveal whether or not the steel will cause
reboiling. The presence or absence of reboiling is determined by visual inspection.
This test method is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.12 on
Materials for Porcelain Enamel and Ceramic-Metal Systems.
Current edition approved April 1, 2011Nov. 1, 2016. Published April 2011November 2016. Originally approved in 1969. Last previous edition approved in 20062011 as
C632 – 88 (2006).(2011). DOI: 10.1520/C0632-88R11E01.10.1520/C0632-88R16.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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
C632 − 88 (2016)
5. Significance and Use
5.1 The results of this test indicate whether or not a sheet steel will cause reboiling under one given set of enameling conditions
and enable the enamel processor to establish a possible source of imperfections in the finished coating.
5.2 This test method is normally used to test samples from lots, coils, or lifts of sheet steel which for some reason, production
problems, defects evident on enameled parts, or production experience are suspected of causing defects in enameled ware which
have the appearance of reboiling. It is often used to establish whether a problem exists with the bare steel or other factors such
as the porcelain enamel, processing contamination, and so forth.
6. Apparatus
6.1 This test can be conducted in any laboratory equipped for general porcelain enameling. It does not require facilities for metal
surface preparation.
7. Reagents and Materials
7.1 Steel Sheet, sufficient in size to provide samples as described in 8.1 and 8.1.1.
7.2 Porcelain-Enamel, Ground-Coat Slip, obtained from production milling or prepared in laboratory facilities.
7.3 Acetone or Isopropyl Alcohol, reagent grade.
8. Sampling
8.1 Shear su
...