ASTM C1422-99(2005)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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.
e1
Designation: C 1422 – 99 (Reapproved 2005)
Standard Specification for
Chemically Strengthened Flat Glass
This standard is issued under the fixed designation C 1422; 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.
e NOTE—Figure 1 was editorially updated in May 2005.
1. Scope C 1279 Test Method for Nondestructive Photoelastic Mea-
surement of Edge and Surface Stresses in Annealed,
1.1 This specification covers the requirements for chemi-
Heat-Strengthened, and Fully Tempered Flat Glass
cally strengthened glass products that originate from flat glass
and are used in general building construction, transportation,
3. Terminology
and other specialty applications, such as copy machine scan-
3.1 Definitions—Refer to Terminology C 162, as appropri-
ners, computer disks, and flat glass screens for television
ate.
monitors. Techniques such as ion implantation, dealkalization,
3.1.1 blemishes—Refer to Specification C 1036 for flat
etch-strengthening, and glaze coatings are specifically ex-
glass.
cluded.
3.2 Definitions of Terms Specific to This Standard:
1.2 Classification of chemically strengthened glass products
3.2.1 case depth—depth of compression below the surface
is based on the laboratory measurements of surface compres-
to the nearest zero stress plane.
sion and case depth and not on the modulus of rupture (MOR).
3.2.2 chemically strengthened glass—glass which has been
This specification does not purport to address end-use perfor-
strengthened by ion-exchange to produce a compressive stress
mance.
layer at the treated surface.
1.3 This standard does not purport to address all of the
3.2.3 ion-exchange process—the exchange of constituent
safety concerns, if any, associated with its use. It is the
ions in the glass with externally supplied ions (generally at
responsibility of the user of this standard to establish appro-
temperatures near the strain point of the glass). This may be
priate safety and health practices and determine the applica-
accomplished by immersing glass in a molten salt bath or
bility of regulatory limitations prior to use.
solution with or without electric field assistance, exposing
1.4 Dimensional values are stated in SI units, the standard
glass to plasma, applying a paste on the glass surface, or
units for this specification. Inch-pound units, given in paren-
surface crystallization with or without electric field assistance.
theses, are for information only.
3.2.4 surface compression—an in-plane stress which tends
2. Referenced Documents to compact the atoms in the surface.
2.1 ASTM Standards:
4. Significance and Use
C 162 Terminology of Glass and Glass Products
4.1 Chemically strengthened glass is significantly stronger
C 978 Test Method for Photoelastic Determination of Re-
than annealed glass, depending upon the glass composition,
sidual Stress in a Transparent Glass Matrix Using a
strengthening process, level of abrasion, and the application
Polarizing Microscope and Optical Retardation Compen-
environment. The strengthening process does not contribute
sation Procedures
significantly to optical distortion.
C 1036 Specification for Flat Glass
4.2 The chemical strengthening process can effectively
strengthen glass of all sizes and shapes and can be useful in
This specification is under the jurisdiction of ASTM Committee C14 on Glass cases in which glass is too thin, small, or complex-shaped for
and Glass Products and is the direct responsibility of Subcommittee C14.08 on Flat
thermal tempering.
Glass.
4.3 Monolithic chemically strengthened glass is not a safety
Current edition approved April 1, 2005. Published April 2005. Originally
glazing product because its break pattern is similar to that of
approved in 1999. Last previous edition approved in 1999 as C1422–99.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
annealed glass. When safety glazing is required, chemically
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
strengthened glass shall be laminated.
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.
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.
e1
C 1422 – 99 (2005)
FIG. 1 Slice Location
4.4 The very nature of the chemical strengthening process 5.1.2.6 Level F—Case depth, >500 µm (0.020 in.).
alterstheglasssurfacechemistry.Therefore,theproceduresfor
and the performance of postprocessing steps, such as laminat- 6. Ordering Information
ing and coating, can be different from that of nonchemically
6.1 Purchasers should select the preferred options permitted
strengthened glass.
in this specification and include the following information in
4.5 Modulus of rupture (MOR), weight gain, and optical
the procurement documents:
methods are other methods used for process control in chemi-
6.1.1 Title, number, and date of this specification.
cal strengthening.
6.1.2 Surface compression (see 5.1.1) or minimum accept-
able value.
5. Classification
6.1.3 Case depth (see 5.1.2) or minimum acceptable value.
5.1 Kinds—Chemically strengthened glass furnished in ac-
6.1.4 Fabrication information (see 7.1).
cordance with this specification shall be classified on the basis
of the surface compression levels (Level 1-5) and case depth
7. Fabrication
(Levels A-F). These levels are independent of each other.
7.1 Fabrication—After the glass has been chemically
Increasing levels of surface compression permit an increasing
strengthened, it shall only be modified as recommended by the
amount of flexure. Greater case depths offer more protection
fabricator. No modification shall be made that will affect the
from strength reduction caused by abuse and abrasion. The
surface compression and case depth.
thicknessofthetestspecimenshallbereportedwiththesurface
7.1.1 Thickness—Substrates for chemically strengthened
compression and case depth levels. Case depth val
...