ASTM C1443-99
(Specification)Standard Specification for Glasses, Portlight, Circular, Fully Tempered
Standard Specification for Glasses, Portlight, Circular, Fully Tempered
SCOPE
1.1 This specification covers the requirements for circular, fully tempered, high clarity, flat glasses used for portlight applications.
1.2 The dimensional values stated in English units are to be regarded as standard. The values given in parentheses are for information only.
1.3 The following safety hazard caveat pertains only to the test method portion, Section 11, of this specification: 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 to determine the applicability of regulatory limitations prior to use.
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Designation: C 1443 – 99
Standard Specification for
Glasses, Portlight, Circular, Fully Tempered
This standard is issued under the fixed designation C 1443; 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.
1. Scope 4. Classification
1.1 This specification covers the requirements for circular, 4.1 Glasses covered by this specification shall be of the
fully tempered, high clarity, flat glasses used for portlight following types, as specified (see 5.1):
applications. 4.1.1 Type 1—Plain edges, both faces polished,
1.2 The dimensional values stated in English units are to be 4.1.2 Type II—Plain edge, one face polished, opposite face
regarded as standard. The values given in parentheses are for frosted,
information only. 4.1.3 Type III—Rabbeted edge, both faces polished, or
1.3 The following safety hazard caveat pertains only to the 4.1.4 Type IV—Rabbeted edge, one face polished, opposite
test method portion, Section 11, of this specification: This face frosted.
standard does not purport to address all of the safety concerns,
5. Ordering Information
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health 5.1 Purchasers should select the preferred options permitted
in this specification, and include the following information in
practices and determine the applicability of regulatory limita-
tions prior to use. procurement documents:
5.1.1 Title, number, and date of this specification,
2. Referenced Documents
5.1.2 Type of portlight glasses, as requested (see 4.1),
2.1 ASTM Standards: 5.1.3 Dimensions of portlight glasses (see 8.1 and 9.3), and
C 162 Terminology of Glass and Glass Products 5.1.4 Type, class, and quality of glass (see Specification
C 1036 Specification for Flat Glass C 1036) and heat treatment (see Specification C 1048).
C 1048 Specification for Heat-Treated Flat Glass—Kind 5.2 Samples—If samples are to be supplied with bids, they
HS, Kind FT Coated and Uncoated Glass should be specifically requested in the invitation for bids and
C 1279 Test Method for Non-Destructive Photoelastic Mea- the particular purpose to be served by the bid sample should be
surement of Edge and Surface Stresses in Annealed, Heat clearly stated.
Strengthened, and Full Tempered Glass
6. Materials and Manufacture
2.2 ANSI Standard:
ANSI Z1.4 Sampling Procedures and Tables for Inspection 6.1 Material—The glass used shall be glazing quality, float
glass in accordance with the requirements for Specification
by Attributes (DOD Adopted)
C 1036, Type I, Class 1, quality q or higher, if required, and
3. Terminology
heat-treated Specification C 1048, kind FT.
3.1 Definitions—For definitions of terms used in this speci- 6.2 Marking—Specimens shall exhibit the words “fully
fication, refer to Terminology C 162 and also Specifications tempered” approximately ⁄2 in. (12.7 mm) from the edge by
C 1036 and C 1048 and Test Method C 1279. means of etching or sand blasting. Marking shall be done
before heat treating.
7. Other Requirements
This specification is under the jurisdiction ofASTM Committee C-14 on Glass
7.1 Breaking Strength—Glasses shall exhibit satisfactory
and Glass Products and is the direct responsibility of Subcommittee C14.08 on Flat
Glass.
resistance to breakage (see 11.1.2.1).
Current edition approved Sept. 10, 1999. Published November 1999.
7.2 Surface and Edge Compression—Type I and III glasses
Annual Book of ASTM Standards, Vol 15.02.
shall have a surface compression of not less than 10 000 psi or
American National Standards Institute (ANSI), Inc., 11W. 42nd St., NewYork,
NY 10036. an edge compression of not less than 9700 psi (see 11.1.1.2).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C 1443
TABLE 2 Sampling for Surface and Edge Stress Examination
7.3 Clarity—When glasses are tested (see 11.1.2.3), black
and Tests
and white lines of the clarity target shall be definitely distin-
Allowable Number of Allowable Number of
guishable for all parts of the critical area.
Sample Failures for Surface and Failures for Tests (Load,
7.4 Warpage—Glasses shall not exhibit more than ⁄32in.
Lot Size Size Edge Stress Examination Clarity, Warpage)
(0.8 mm) warpage along any line on either face (see 11.1.2.3).
1-6 all none none
A
8. Dimensions
7-50 6 load
B
... ... none clarity: none
8.1 The dimensions of the specimens shall be as specified in
C
51-100 14 warpage: none
5.1. The thickness of a circular glass specimen shall not vary
A
load
more than ⁄32 in. (0.8 mm) between any two points on its
B
101-1000 10 none clarity: none
periphery. Dimensional tolerances for circular cut glasses shall
C
warpage: none
not exceed values specified in Table 1 and Specification
A
See 11.1.2.1.
B
C 1036.
Supplier may, at his option, test all remaining glasses in the lot for clarity in
accordancewith11.1.2.2andallglassesthatpassshallbeconsideredacceptable.
C
Supplier may, at his option, test all remaining glasses in the lot for warpage in
9. Finish and Appearance
accordancewith11.1.2.3andallglassesthatpassshallbeconsideredacceptable.
9.1 Finish—Glasses shall be finished by grinding to the
tolerances specified in 8.1. Edges shall be ground, with corners
chamfered ⁄16 in. (1.6 mm).
11. Inspection, Acceptance and Rejection
9.2 Types II and IV—The designated faces of the glasses
11.1 Responsibility—The supplier is responsible for inspec-
shall be uniformly frosted by sand blasting or etching.
tion of cut specimens unless otherwise specified in the contract
9.3 Types III and IV—The edges of the glasses shall be
or purchase order. Two forms of inspection are required:
rabbeted. The depth of the rabbet in the horizontal direction
examination and test.
and in the vertical direction shall be specified by the purchaser
11.1.1 Examination—Inspection by examination shall con-
(see 5.1.3). Depth dimensions for the rabbet shall be accurate
1 sist of determining compliance with visual and dimensional
to within ⁄32 in. (0.8 mm) when measured from the edge and
requirements.
from the face of the glass. One edge of the rabbet shall be
11.1.1.1 Visual and Dimensional Examinations—All speci-
perpendicular to the face of the glass and the other edge of the
mens of a sample size selected in accordance with 10.1.1 shall
rabbet shall be perpendicular to the edge of the glass such that
be examined to verify conformance to all of the requirements
the angle formed by the faces of the rabbet is 90 6 2°.
which do not involve tests or polariscopic examination.The lot
10. Sampling shall be accepted if all of the specimens in the sample (see
10.1.1) conform to visual requirements of Section 6.2 and
10.1 Inspection Lot—For purposes of inspection, a lot shall
Section 9 and dimensional requirements of Section 8. The lot
consist of not more than 1000 specimens which shall be of a
shall be rejected if any of the specimens in the sample fail to
single thickness, produced in a single plant and offered for
conformtotheserequirements.Ifthelotisrejectedonthebasis
delivery at one time.
of visual and dimensional examination, the supplier may at his
10.1.1 Sampling for Visual and Dimensional
option examine all remaining specimens of the lot to determine
Examinations—Samples shall be selected in accordance with
conformance with visual and dimensional requirements. Any
the procedures of ANSI Z1.4 at inspection Level II for
of the specimens of the lot that comply with the visual and
examination in accordance with 11.1.1.1.
dimensional requirements shall be considered acceptable, sub-
10.1.2 Sampling for Surface and Edge Stress—Samples
ject to conformance with polariscopic examination require-
shall be selected at random in accordance with Table 2 for
ments and test requirements.
examination in accordance with 11.1.1.2. When a lot contains
11.1.1.2 Surface and Edge Stresses, (Type I and Type III
fewer than seven glasses, or when a special use (see 5.1)
Glasses)—All specimens of a sample size selected in accor-
requires protection against defects, the sample shall consist of
dance with 10.1.2 shall be subjected to surface or edge stress
all specimens in the lot. Where the lot consists of between 7
examination (see 7.2) to determine if they are fully tempered.
and 50 glasses, the sample shall consist of 6 specimens.Where
It is suggested that Type III glasses be tested for surface stress.
thelotconsistsofbetween51and100glasses,thesampleshall
Test Method C 1279 is recommended for testing edge and
consistof14specimens.Lotscontainingmorethan100glasses
surface stresses. If any glass specimen from a sample under-
shall be evaluated by means of a sample of 10 specimens.
going surface and edge stress examination does not meet the
Samples from lots consisting of more than 6 glasses shall
requiredvalues(see7.2),thelotshallberejectedinaccordance
contain a representative variety of types and diameters.
with criteria given in Table 2.
10.1.3 Sampling for Test—Sampling for all tests to be
11.1.2 Test Acceptance or Rejection—Inspection by test
performed on specimens shall be in accordance with 10.1.2.
shall consist of load, clarity, and warpage tests.
11.1.2.1 Load Test—Allspecimensofasamplesizeselected
TABLE 1 Permitted Tolerances
in accordance with 10.1.3 shall be tested under a load applied
Dimension Tolerance, 6 in. (6 mm)
without shock using the jig illustrated in Fig. 1. Each of the
Diameter ⁄16 (1.6)
specimens shall be placed centrally between the upper and
Depth of rabbet ⁄32 (0.8)
lower steel beams which should be perpendicular as shown in
C 1443
FIG. 1 Load Apparatus (see 11.1.2.1)
side and end views,
...
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