ASTM D1388-07
(Test Method)Standard Test Method for Stiffness of Fabrics
Standard Test Method for Stiffness of Fabrics
SIGNIFICANCE AND USE
Both test options in this test method are considered satisfactory for acceptance testing of commercial shipments since current estimates of between-laboratory precision are acceptable and the method is used extensively in the trade for acceptance testing.
5.1.1 In case 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 that are as homogeneous as possible and that are from a lot of material of the type in question. 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 the appropriate statistical analysis and an acceptable probability level chosen by the two parties before testing is begun. 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 with consideration to the known bias.
In general, these procedures are more suitable for testing woven fabrics than knit fabrics.
The Cantilever Test Option is the preferred procedure because it is simpler to perform. It is, however, not suitable for very limp fabrics or those that show a marked tendency to curl or twist at a cut edge.
The Heart Loop Test Option is suitable for fabrics that show a tendency to curl or twist.
Both options can provide a correlation with a subjective evaluation of a given fabric type. That is, a higher number represents a stiffer fabric.
The stiffness of a fabric may change with storage.
No evidence has been found showing that bending length is dependent on the width. The tendency for specimens to curl or twist will affect...
SCOPE
1.1 This test method covers the measurement of stiffness properties of fabrics. Bending length is measured and flexural rigidity is calculated. Two procedures are provided.
1.1.1 Option A - Cantilever Test, employing the principle of cantilever bending of the fabric under its own mass.
1.1.2 Option B - Heart Loop Test, employing the principle of a loop formed in a fabric strip and hung vertically.
1.2 This test method applies to most fabrics including woven fabrics, air bag fabrics, blankets, napped fabrics, knitted fabrics, layered fabrics, pile fabrics. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated.
1.3 The values stated in SI units are to be regarded as the standard. The U.S. customary units may be approximate.
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
Relations
Standards Content (Sample)
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
Designation:D1388–07
Standard Test Method for
1
Stiffness of Fabrics
This standard is issued under the fixed designation D1388; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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. Terminology
1.1 This test method covers the measurement of stiffness 3.1 For all terminology relating to D13.59, Fabric Test
properties of fabrics. Bending length is measured and flexural Methods, General, refer to Terminology D4850.
rigidity is calculated. Two procedures are provided. 3.1.1 The following terms are relevant to this standard:
1.1.1 Option A—CantileverTest,employingtheprincipleof bending length, cross-machine direction, CD, fabric, flexural
cantilever bending of the fabric under its own mass. rigidity, machine direction, MD, stiffness.
1.1.2 Option B—Heart Loop Test, employing the principle 3.2 For all other terminology related to textiles, refer to
of a loop formed in a fabric strip and hung vertically. Terminology D123.
1.2 This test method applies to most fabrics including
4. Summary of Test Method Options
wovenfabrics,airbagfabrics,blankets,nappedfabrics,knitted
4.1 Option A, Cantilever Test—A specimen is slid at a
fabrics, layered fabrics, pile fabrics. The fabrics may be
untreated, heavily sized, coated, resin-treated, or otherwise specified rate in a direction parallel to its long dimension, until
its leading edge projects from the edge of a horizontal surface.
treated.
1.3 The values stated in SI units are to be regarded as the The length of the overhang is measured when the tip of the
specimen is depressed under its own mass to the point where
standard. The U.S. customary units may be approximate.
1.4 This standard does not purport to address all of the the line joining the top to the edge of the platform makes a
0.724 rad (41.5°) angle with the horizontal. From this mea-
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- sured length, the bending length and flexural rigidity are
calculated.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 4.2 Option B, Heart Loop Test—Astrip of fabric is formed
into a heart-shaped loop. The length of the loop is measured
2. Referenced Documents
when it is hanging vertically under its own mass. From this
2
2.1 ASTM Standards: measured length, the bending length and flexural rigidity are
D123 Terminology Relating to Textiles calculated.
D1776 Practice for Conditioning and Testing Textiles
5. Significance and Use
D2904 PracticeforInterlaboratoryTestingofaTextileTest
5.1 Both test options in this test method are considered
Method that Produces Normally Distributed Data
D2906 Practice for Statements on Precision and Bias for satisfactory for acceptance testing of commercial shipments
since current estimates of between-laboratory precision are
Textiles
D3776 Test Methods for Mass Per Unit Area (Weight) of acceptable and the method is used extensively in the trade for
acceptance testing.
Fabric
D4850 Terminology Relating to Fabric 5.1.1 In case of a dispute arising from differences in
reportedtestresultswhenusingthistestmethodforacceptance
testing of commercial shipments, the purchaser and the sup-
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD13onTextiles plier should conduct comparative tests to determine if there is
and is the direct responsibility of Subcommittee D13.60 on Fabric Test Methods,
a statistical bias between their laboratories. Competent statis-
Specific.
tical assistance is recommended for the investigation of bias.
Current edition approved July 1, 2007. Published August 2007. Originally
As a minimum, the two parties should take a group of test
approved in 1956. Discontinued 1995 and reinstated as D1388–96. Last previous
edition approved in 2002 as D1388–96(2002).
specimens that are as homogeneous as possible and that are
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
from a lot of material of the type in question. Test specimens
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
should then be randomly assigned in equal numbers to each
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. laboratory for testing. The average results from the two
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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D1388–07
3
laboratories should be compared using the appropriate statis- 6.1.1.4 Specimen Feed Unit, motoriz
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D1388–07
Standard Test Method for
1
Stiffness of Fabrics
This standard is issued under the fixed designation D1388; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers the measurement of stiffness properties of fabrics. Bending length is measured and flexural rigidity
is calculated. Two procedures are provided.
1.1.1 Option A—Cantilever Test, employing the principle of cantilever bending of the fabric under its own mass.
1.1.2 Option B—Heart Loop Test, employing the principle of a loop formed in a fabric strip and hung vertically.
1.2 This test method applies to most fabrics including woven fabrics, air bag fabrics, blankets, napped fabrics, knitted fabrics,
layered fabrics, pile fabrics. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated.
1.3 The values stated in SI units are to be regarded as the standard. The U.S. customary units may be approximate.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D123 Terminology Relating to Textiles
D1776 Practice for Conditioning and Testing Textiles
D2904 Practice for Interlaboratory Testing of a Textile Test Method that Produces Normally Distributed Data
D2906 Practice for Statements on Precision and Bias for Textiles
D3776 Test Methods for Mass Per Unit Area (Weight) of Fabric
D4850 Terminology Relating to Fabric
3. Terminology
3.1 For all terminology relating to D13.59, Fabric Test Methods, General, refer to Terminology D4850.
3.1.1 The following terms are relevant to this standard: bending length, cross-machine direction, CD, fabric, flexural rigidity,
machine direction, MD, stiffness.
3.2 For all other terminology related to textiles, refer to Terminology D123.
4. Summary of Test Method Options
4.1 Option A, Cantilever Test—Aspecimenisslidataspecifiedrateinadirectionparalleltoitslongdimension,untilitsleading
edge projects from the edge of a horizontal surface. The length of the overhang is measured when the tip of the specimen is
depressedunderitsownmasstothepointwherethelinejoiningthetoptotheedgeoftheplatformmakesa0.724rad(41.5°)angle
with the horizontal. From this measured length, the bending length and flexural rigidity are calculated.
4.2 Option B, Heart Loop Test—Astrip of fabric is formed into a heart-shaped loop. The length of the loop is measured when
it is hanging vertically under its own mass. From this measured length, the bending length and flexural rigidity are calculated.
5. Significance and Use
5.1 Bothtestoptionsinthistestmethodareconsideredsatisfactoryforacceptancetestingofcommercialshipmentssincecurrent
estimates of between-laboratory precision are acceptable and the method is used extensively in the trade for acceptance testing.
5.1.1 In case 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
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD13onTextilesandisthedirectresponsibilityofSubcommitteeD13.60onFabricTestMethods,Specific.
Current edition approved July 1, 2007. Published August 2007. Originally approved in 1956. Discontinued 1995 and reinstated as D1388–96. Last previous edition
approved in 2002 as D1388–96(2002).
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM 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.
1
---------------------- Page: 1 ----------------------
D1388–07
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 that are as homogeneous as possible and that are from a lot of material of the type
in question.Test specimens should th
...
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