ASTM C162-04
(Terminology)Standard Terminology of Glass and Glass Products
Standard Terminology of Glass and Glass Products
SCOPE
1.1 This terminology defines terms generally used in the glass industry.
1.2 In some cases in which a usage is specific to a ceertain industry, that is spelled out within the definition. For completeness and hisotrical purposes, terms that are outdated are listed as being archaic. The reader is cautioned that some companies or industries may define or use terms differently than the way these terms are defined within this terminology.
1.3 Other sources of glass glossaries are Glass Association of North America's Glazing Manual, Engineering Standards Manual for Tempered Glass, Laminated Glass Design Guide,and ASTM Committee C-14 standards.
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Designation:C 162–04
Standard Terminology of
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Glass and Glass Products
This standard is issued under the fixed designation C 162; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope Abbé value5~n 2 1!/~n 2 n !
d F C
where n is the refractive index for the helium line at 587.6
1.1 This terminology defines terms generally used in the d
nm and n and n are the refractive indices for the hydrogen
F C
glass industry.
lines at 486.1 and 656.3 nm, respectively. See synonymous
1.2 In some cases in which a usage is specific to a certain
term nu-value and related term dispersion.
industry, that is spelled out within the definition. For complete-
acid polishing—the polishing of a glass surface by acid
ness and historical purposes, terms that are outdated are listed
treatment.
as being archaic. The reader is cautioned that some companies
air bells—bubbles of irregular shape formed generally during
or industries may define or use terms differently than the way
the pressing or molding operations in the manufacture of
these terms are defined within this terminology.
optical glass.
1.3 Other sources of glass glossaries are Glass Association
2
alabaster glass—a milky-white glass that diffuses light with-
of North America’s Glazing Manual, Engineering Standards
2
out fiery color.
Manual for Tempered Glass, Laminated Glass Design
2
alcove—a narrow channel to convey molten glass from refiner
Guide, and ASTM Committee C-14 standards.
to forehearth or to the revolving pot where it is gathered by
2. Referenced Documents
the Owens machine.
3
alkali—an industrial term for the oxide of sodium or potas-
2.1 ASTM Standards:
sium; less frequently of lithium.
C 148 Test Methods for Polariscopic Examination of Glass
ampoule—a glass container designed to be filled and sealed by
Containers
fusion of the glass neck.
C 336 Test Method for Annealing Point and Strain Point of
anneal—to attain acceptably low stresses, or desired structure,
Glass by Fiber Elongation
or both, in glass by controlled cooling from a suitable
C 338 Test Method for Softening Point of Glass
temperature.
C 598 Test Method for Annealing Point and Strain Point of
annealing—a controlled cooling process for glass designed to
Glass by Beam Bending
reduce residual stress to a commercially acceptable level and
C 1048 Specification for Heat-Treated Glass—Kind HS,
modify structure.
Kind FT Coated and Uncoated Glass
annealing point (A.P.)—thattemperaturecorrespondingeither
C 1172 SpecificationforLaminatedArchitecturalFlatGlass
to a specific rate of elongation of a glass fiber when
3. Terminology
measured by Test Method C 336, or a specific rate of
midpoint deflection of a glass beam when measured by Test
Abbé value—the reciprocal dispersive power, a value used in
Method C 598. At the annealing point of glass, internal
optical design, expressed mathematically as:
stresses are substantially relieved in a matter of minutes.
annealing range—the range of glass temperature in which
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stress in glass can be relieved at a commercially practical
This terminology is under the jurisdiction of ASTM Committee C14 on Glass
and Glass Products and is the direct responsibility of Subcommittee C14.01 on
rate. For purposes of comparing glasses, the annealing range
Nomenclature and Definitions.
is assumed to correspond with the temperature between the
Current edition approved June 1, 2004. Published June 2004. Originally
annealing point (A.P.) and the strain point (St.P.).
approved in 1941. Last previous edition approved in 2003 as C 162 – 03.
2
antimony—an industrial term for an oxide of antimony.
Glass Association of North America, 3310 S.W. Harrison, Topeka, KS
66611-2279.
arch, n—a part of a melter; a crown.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
arch, v—to heat a pot in a pot arch.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
arrest mark—See dwell mark.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. arsenic—an industrial term for an oxide of arsenic.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C162–04
aventurine—glass containing colored, opaque spangles of (2) a semi-finished piece of glass for making an optical
nonglassy material. element, such as a lens or prism. Also known as a pressing.
back wall—the wall at the charging end of a melter.
blanket feed—a method for charg
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