ASTM C1651-11(2018)
(Test Method)Standard Test Method for Measurement of Roll Wave Optical Distortion in Heat-Treated Flat Glass
Standard Test Method for Measurement of Roll Wave Optical Distortion in Heat-Treated Flat Glass
SIGNIFICANCE AND USE
5.1 This test method is a procedure for determining the peak-to-valley depth and the wavelength of roll wave in flat glass and then calculating the optical distortion resulting from that roll wave. Peak-to-valley measurements provide a means of monitoring the roll wave distortion in a heat processed glass product.
5.2 Measured peak-to-valley depth provides information required by some specifiers of heat-treated glass products.
5.3 Roll wave is inherent in flat glass which has been heat treated in a furnace in which rollers are used to convey the glass.
5.4 Consult Specifications C1036 and C1048 for additional glass characteristics and quality information.
SCOPE
1.1 This test method is applicable to the determination of the peak-to-valley depth and peak-to-peak distances of the out-of-plane deformation referred to as roll wave which occurs in flat, heat-treated architectural glass substrates processed in a heat processing continuous or oscillating conveyance oven.
1.2 This test method does not address other flatness issues like edge kink, ream, pocket distortion, bow, or other distortions outside of roll wave as defined in this test method.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 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
Relations
Standards Content (Sample)
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.
Designation: C1651 − 11 (Reapproved 2018)
Standard Test Method for
Measurement of Roll Wave Optical Distortion in Heat-
1
Treated Flat Glass
This standard is issued under the fixed designation C1651; 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 C1036 Specification for Flat Glass
C1048 Specification for Heat-Strengthened and Fully Tem-
1.1 This test method is applicable to the determination of
pered Flat Glass
the peak-to-valley depth and peak-to-peak distances of the
out-of-plane deformation referred to as roll wave which occurs
3. Terminology
in flat, heat-treated architectural glass substrates processed in a
heat processing continuous or oscillating conveyance oven.
3.1 Definitions of Terms Specific to This Standard:
3.1.1 peak-to-valley depth of roll wave—characteristic
1.2 This test method does not address other flatness issues
depth, W, of roll wave as illustrated in Fig. 1.
like edge kink, ream, pocket distortion, bow, or other distor-
3.1.2 peak-to-peak wavelength of roll wave—characteristic
tions outside of roll wave as defined in this test method.
length, L, of roll wave shown as a sine-wave representing the
1.3 The values stated in inch-pound units are to be regarded
deformed surface section as illustrated in Fig. 1.
as standard. The values given in parentheses are mathematical
3.1.3 roll wave—A repetitive wave-like departure from
conversions to SI units that are provided for information only
flatness in glass that results from heat treating the glass in a
and are not considered standard.
horizontal roller hearth furnace. Roll wave excludes edge
1.4 This standard does not purport to address all of the
effectssuchasedgekinkanddistortioninfluencedbyassembly
safety concerns, if any, associated with its use. It is the
or installation.
responsibility of the user of this standard to establish appro-
3.1.4 roll wave optical distortion—visual distortion, D, that
priate safety, health, and environmental practices and deter-
results from roll wave and expressed as lens power as in Eq 1.
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
3.1.5 valley-to-valley wavelength of roll wave—
dance with internationally recognized principles on standard-
characteristic length, L, of roll wave shown as a sine-wave
ization established in the Decision on Principles for the
representing the deformed surface section as illustrated in Fig.
Development of International Standards, Guides and Recom-
1.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
4. Summary of Test Method
4.1 This test consists of moving an instrument across the
2. Referenced Documents
glass surface in a direction parallel to the direction that the
2.1 Reference to these documents shall be the latest issue
glass substrate traveled during heat processing. The instrument
unless otherwise specified by the authority applying this test
will primarily measure the out-of-plane deformation of the
method.
glass surface which is characteristic of the glass and known as
2
“roll wave”. The peak-to-valley depths of the roll waves, W,
2.2 ASTM Standards:
C162 Terminology of Glass and Glass Products and the peak-to-peak distances, L, are measured. (See Fig. 1.)
4.1.1 Other out-of-plane deformations of the glass surface
may also be present which do not have the same peak and
1
This test method is under the jurisdiction of ASTM Committee C14 on Glass valley wave character of the roll wave, but which also result in
and Glass Products and is the direct responsibility of Subcommittee C14.11 on
the appearance of optical distortion in the glass.
Optical Properties.
4.1.2 The optical distortion due to the out-of-plane defor-
Current edition approved Aug. 1, 2018. Published August 2018. Originally
mation of the surface is measured as an optical power, similar
approved in 2008. Last previous edition approved in 2011 as C1651 – 11. DOI:
10.1520/C1651-11R18.
to the optical power of a cylindrical mirror or lens.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1.3 For those deformations that do have a wave character,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
the distortion can be calculated using the following formula.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. From the measured roll wave depth
...
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