ASTM D4912-02
(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
SIGNIFICANCE AND USE
This test method is considered satisfactory for acceptance testing of commerical shipments since the method has been used extensively in the trade for acceptance testing.
5.1.1 In cases of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens which are as homogeneous as possible and which are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student’t-test for unpaired data and an acceptable probability level chosen by the two parties before the testing begins. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results in the light of the known bias.
Vinyl-coated glass yarn insect screening and louver cloth are subjected to a heating process to fuse the warp yarns to the filling yarns of the woven structure. The force at which yarns in one direction move over yarns in the opposite direction is a measure of the bond of fusion. The degree of the bond of fusion on the vinyl-coated glass yarn insect screening and louver cloth is used for process control. Fabric stability was formerly called resistance to yarn slippage.
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 expressed in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with this standard.
1.3 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 determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
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Designation:D4912–02
Standard Test Method for
Fabric Stability of Vinyl-Coated Glass Yarn Insect Screening
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and Louver Cloth
This standard is issued under the fixed designation D 4912; 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 3.1.1 atmosphere for testing textiles, n—for glass, air main-
tained at a relative humidity of at least 48 % and no greater
1.1 This test method provides a procedure for evaluating
than 67 %, and at a temperature of at least 20°C (68°F) and no
fabric stability by measuring the resistance to yarn slippage of
greater than 25°C (77°F).
filling yarns over warp yarns, or warp yarns over filling yarns
3.1.1.1 Discussion—Glass textiles are used in various prod-
in vinyl-coated glass yarn insect screening and louver cloth.
ucts such as reinforced plastics, mat-like material, tire cords,
1.2 This test method shows the values in both SI units and
electrical insulation, etc. Each of these materials requires
inch-pound units. “SI units” is the technically correct name for
different testing atmospheres. It is the intent of the wide spread
a system of metric units known as the International System of
in testing atmosphere to allow testing of glass textiles in
Units. “Inch-pound units” is the technically correct name for
respective laboratories where end-product test atmosphere
the customary units used in the United States. The values
requirements differ. The test atmospheres for respective prod-
expressed in each system may not be exact equivalents;
ucts should be controlled as specified in Specification E 171. It
therefore,eachsystemshallbeusedindependentlyoftheother.
is the opinion of ASTM Subcommittee D13.18 that fabric
Combining values from the two systems may result in non-
stability of insect screening and louver cloth would not be
conformance with this standard.
affectedbytherangeselected.Inanyevent,thetestatmosphere
1.3 This standard does not purport to address all of the
should be stated in the report.
safety concerns, if any, associated with its use. It is the
3.1.2 fabric stability, n—in vinyl coated glass screening and
responsibility of the user of this standard to establish appro-
louver cloth, the property denoting the ability to resist slippage
priate safety and health practices and determine the applica-
of yarn segments in one direction over yarn segments in the
bility of regulatory limitations prior to use.
opposite direction.
2. Referenced Documents 3.1.3 For definitions of other textile terms used in this test
method, refer to Terminology D 123.
2.1 ASTM Standards:
D 76 Specification for Tensile Testing Machines for Tex-
4. Summary of Test Method
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tiles
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4.1 Samples of the vinyl-coated glass yarn insect screening
D 123 Terminology Relating to Textiles
or louver cloth are subjected to a breaking force test where
D 4028 Specification for Solar Screening Woven from
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yarns have been severed within the gage length area.The force
Vinyl-Coated Fiber Glass Yarn
requiredtobreakthefusedbondbetweenyarncomponentsand
E 171 Specification for Standard Atmospheres for Condi-
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slip yarn segments in one direction over yarn segments in the
tioning and Testing Materials
opposite direction is reported as the fabric stability.
3. Terminology
5. Significance and Use
3.1 Definitions:
5.1 This test method is considered satisfactory for accep-
tance testing of commerical shipments since the method has
been used extensively in the trade for acceptance testing.
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This test method is under the jurisdiction ofASTM Committee D13 onTextiles
5.1.1 In cases of a dispute arising from differences in
and is the direct responsibility of Subcommittee D13.18 on Glass Fiber and Its
reported test results when using this test method for acceptance
Products.
Current edition approved May 10, 2002. Published August 2002. Originally
testing of commercial shipments, the purchaser and the sup-
published as D 4912–89. Last previous edition D 4912–89(1994)
plier should conduct comparative tests to determine if there is
2
Annual Book of ASTM Standards, Vol 07.01.
3 a statistical bias between their laboratories. Competent statis-
Annual Book of ASTM Standards, Vol 07.02.
4
Annual Book of ASTM Standards, Vol 08.03. tical assistance is recommended for the investigation of bias.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4912
As a minimum, the two parties should take a group of test 7.3 Laboratory Sample—As a laboratory sample for accep-
specimens which are as homogeneous as possibl
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