ASTM D4912-89(1994)
(Test Method)Standard Test Method for Fabric Stability of Vinyl-Coated Glass Yarn Insect Screening and Louver Cloth
Standard Test Method for Fabric Stability of Vinyl-Coated Glass Yarn Insect Screening and Louver Cloth
SCOPE
1.1 This test method provides a procedure for evaluating fabric stability by measuring the resistance to yarn slippage of filling yarns over warp yarns, or warp yarns over filling yarns in vinyl-coated glass yarn insect screening and louver cloth.
1.2 This test method shows the values in both SI units and inch-pound units. "SI units" is the technically correct name for a system of metric units known as the International System of Units. "Inch-pound units" is the technically correct name for the customary units used in the United States. The values stated in inch-pound units are to be regarded as the standard. The values in SI units are provided for information only.
1.3 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
ASTM D4922 89 - 0759530 057L47L 336 -
Designation: D 4912 - 89 (Reapproved 1994)
Standard Test Method for
Fabric Stability of Vinyl-Coated Glass Yarn Insect Screening
and Louver Cloth’
This standard is issued under the fixed designation D 49 12; 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 (r) indicates an editorial change since the last revision or reapproval.
atmosphere requirements differ. The test atmospheres for
1. Scope
respective products should be controlled as specified in
1.1 This test method provides a procedure for evaluating
Specification E 17 1. It is the opinion of ASTM Subcom-
fabric stability by measuring the resistance to yam slippage
mittee D13.18 that fabric stability of insect screening and
of filling yarns over warp yarns, or warp yarns over tilling
louver cloth would not be affected by the range selected. In
yarns in vinyl-coated glass yarn insect screening and louver
any event, the test atmosphere should be stated in the report.
cloth.
3.1.2 fabric stability, n-in vinyl coated glass screening
1.2 This test method shows the values in both SI units and
and louver cloth, the property denoting the ability to resist
inch-pound units. ‘91 units” is the technically correct name
slippage of yarn segments in one direction over yam seg-
for a system of metric units known as the International
ments in the opposite direction.
System of Units. “Inch-pound units” is the technically
3.1.3 For definitions of other textile terms used in this test
correct name for the customary units used in the United
method, refer to Terminology D 123.
States. The values stated in inch-pound units are to be
regarded as the standard. The values in SI units are provided
4. Summary of Test Method
for information only.
1.3 This standard does not purport to address all of the
4.1 Samples of the vinyl-coated glass yam insect screening
safety concerns, if any, associated with its use. It is the
or louver cloth are subjected to a breaking force test where
responsibility qf the user qf this standard to establish appro-
yarns have been severed within the gage length area. The
priate safety and health practices and determine the applica-
force required to break the fused bond between yarn
bility of regulatory limitations prior to use.
components and slip yarn segments in one direction over
yarn segments in the opposite direction is reported as the
2. Referenced Documents
fabric stability.
2.1 ASTM Standards:
D76 Specification for Tensile Testing Machines for
5. Significance and Use
Textiles2
5.1 This test method is considered satisfactory for accep-
D 123 Terminology Relating to Textiles2
tance testing of commerical shipments since the method has
D4028 Specification for Solar Screening Woven from
been used extensively in the trade for acceptance testing.
Vinyl-Coated Fiber Glass Yarn3
5.1.1 In cases of a dispute arising from differences in
E 17 1 Specification for Standard Atmospheres for Condi-
reported test results when using this test method for accep-
tioning and Testing Materials4
tance testing of commercial shipments, the purchaser and
the supplier should conduct comparative tests to determine if
3. Terminology
there is a statistical bias between their laboratories. Compe-
3.1 Definitions:
tent statistical assistance is recommended for the investiga-
3.1.1 atmosphere for testing textiles, n:for glass, air
tion of bias. As a minimum, the two parties should take a
maintained at a relative humidity of at least 48 % and no
group of test specimens which are as homogeneous as
greater than 67 %, and at a temperature of at least 20°C
possible and which are from a lot of material of the type in
(68°F) and no greater than 25°C (77°F).
question. The test specimens should then be randomly
3. I. 1.1 Discussion-Glass textiles are used in various
assigned in equal numbers to each laboratory for testing. The
products such as reinforced plastics, mat-like material, tire
average results from the two laboratories should be com-
cords, electrical insulation, etc. Each of these materials
pared using Student’s t-test for unpaired data and an
requires different testing atmospheres. It is the intent of the
acceptable probability level chosen by the two parties before
wide spread in testing atmosphere to allow testing of glass
the testing begins. If a bias is found, either its cause must be
textiles in respective laboratories where end-product test
found and corrected or the purchaser and the supplier must
agree to interpret future test results in the light of the known
bias.
’ This test method is under the jurisdiction of ASTM Committee D-13 on
5.2 Vinyl-coated glass yarn insect screening and louver
Textiles and is the direct responsibility of Subcommittee D13.18 on Glass
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