ASTM C162-99

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Designation: C 162 – 99
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 acid polishing—the polishing of a glass surface by acid
treatment.
1.1 This terminology defines terms generally used in the
air bells—bubbles of irregular shape formed generally during
glass industry.
the pressing or molding operations in the manufacture of
1.2 In some cases in which a usage is specific to a certain
optical glass.
industry, that is spelled out within the definition. For complete-
alabaster glass—a milky-white glass that diffuses light with-
ness and historical purposes, terms that are outdated are listed
out fiery color.
as being archaic. The reader is cautioned that some companies
alcove—a narrow channel to convey molten glass from refiner
or industries may define or use terms differently than the way
to forehearth or to the revolving pot where it is gathered by
these terms are defined within this terminology.
the Owens machine.
1.3 Other sources of glass glossaries are Glass Association
2 alkali—an industrial term for the oxide of sodium or potas-
of North America’s Glazing Manual, Engineering Standards
2
sium; less frequently of lithium.
Manual for Tempered Glass, Laminated Glass Design
2
ampoule—a glass container designed to be filled and sealed by
Guide, and ASTM Committee C-14 standards.
fusion of the glass neck.
2. Referenced Documents anneal—to attain acceptably low stresses, or desired structure,
or both, in glass by controlled cooling from a suitable
2.1 ASTM Standards:
temperature.
C 148 Test Methods for Polariscopic Examination of Glass
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annealing—a controlled cooling process for glass designed to
Containers
reduce residual stress to a commercially acceptable level and
C 336 Test Method for Annealing Point and Strain Point of
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modify structure.
Glass by Fiber Elongation
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annealing point (A.P.)—that temperature corresponding either
C 338 Test Method for Softening Point of Glass
to a specific rate of elongation of a glass fiber when
C 598 Test Method for Annealing Point and Strain Point of
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measured by Test Method C 336, or a specific rate of
Glass by Beam Bending
midpoint deflection of a glass beam when measured by Test
C 1048 Specification for Heat-Treated Glass—Kind HS,
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Method C 598. At the annealing point of glass, internal
Kind FT Coated and Uncoated Glass
stresses are substantially relieved in a matter of minutes.
C 1172 Specification for Laminated Architectural Flat
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annealing range—the range of glass temperature in which
Glass
stress in glass can be relieved at a commercially practical
3. Terminology
rate. For purposes of comparing glasses, the annealing range
is assumed to correspond with the temperature between the
Abbé value—the reciprocal dispersive power, a value used in
annealing point (A.P.) and the strain point (St.P.).
optical design, expressed mathematically as:
antimony—an industrial term for an oxide of antimony.
Abbé value5~n 2 1!/~n 2 n !
d F C
arch, n—a part of a melter; a crown.
where n is the refractive index for the helium line at 587.6
d
arch, v—to heat a pot in a pot arch.
nm and n and n are the refractive indices for the hydrogen
F C
arrest mark—See dwell mark.
lines at 486.1 and 656.3 nm, respectively. See synonymous
arsenic—an industrial term for an oxide of arsenic.
term nu-value and related term dispersion.
aventurine—glass containing colored, opaque spangles of
nonglassy material.
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This terminology is under the jurisdiction of ASTM Committee C14 on Glass back wall—the wall at the charging end of a melter.
and Glass Products and is the direct responsibility of Subcommittee C14.01 on
baffle—a mold part used to close the delivery or baffle hole in
Nomenclature and Definitions.
a blank mold.
Current edition approved May 10, 1999. Published August 1999. Originally
baffle mark—a mark or seam on a bottle resulting from a mold
published as C 162 – 41 T. Last previous edition C 162 – 98a.
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Glass Association of North America, 3310 S.W. Harrison, Topeka, KS joint between blank mold and baffle.
66611-2279.
baffle wall—a wall used to deflect gases or flames in a melter.
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Annual Book of ASTM Standards, Vol 15.02.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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