ASTM D3773/D3773M-10(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D3773/D3773M − 10 (Reapproved 2019)
Standard Test Methods for
Length of Woven Fabric
This standard is issued under the fixed designation D3773/D3773M; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope D4850 Terminology Relating to Fabrics and Fabric Test
Methods
1.1 These test methods cover four options for measuring
E177 Practice for Use of the Terms Precision and Bias in
fabric length and are applicable to full rolls or bolts of
ASTM Test Methods
materials.
1.2 There are four approved options of measuring length as 3. Terminology
follows:
3.1 For all terminology relating to D13.60, Fabric Test
1.2.1 Option A—Hand (Section 6).
Methods, Specific, refer to Terminology D4850.
1.2.2 Option B—Drum (Section 7).
3.1.1 The following terms are relevant to this standard:
1.2.3 Option C—Clock (Section 8).
length, stable fabric, woven fabric
1.2.4 Option D—Folding (Section 9).
3.2 For definitions of other textile terms used in this test
1.3 The values stated in either SI units or in U.S. customary
method, refer to Terminology D123.
unitsshallberegardedseparatelyasstandard.Thevaluesstated
in each system may not be exact equivalents; therefore, each
4. Summary of Test Methods
system must be used independently of the other, without
4.1 The length is measured from one end of the fabric to the
combining values in any way.
other, using a suitable graduated device, or apparatus as
1.4 This standard does not purport to address all of the
described in the option used.
safety concerns, if any, associated with its use. It is the
5. Conditioning
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
5.1 Condition the specimens as directed in Practice D1776.
mine the applicability of regulatory limitations prior to use.
5.2 When full rolls or bolts of fabric cannot be properly
1.5 This international standard was developed in accor-
conditioned in a reasonable time with available facilities,
dance with internationally recognized principles on standard-
perform the tests without conditioning and report the actual
ization established in the Decision on Principles for the
conditions prevailing at the time of the test. Such results may
Development of International Standards, Guides and Recom-
not correspond with the results obtained after testing in the
mendations issued by the World Trade Organization Technical
standard atmosphere for testing textiles.
Barriers to Trade (TBT) Committee.
6. Option A—Hand
2. Referenced Documents
6.1 Significance and Use—The hand method specifies that
2.1 ASTM Standards:
the length of a fabric be measured in a relaxed tension-free
D123 Terminology Relating to Textiles
manner. This test method is the referee method to which all
D1776 Practice for Conditioning and Testing Textiles
other test methods shall be compared for the establishment of
their accuracy. This test method can be used for acceptance
1 testing, although it is not used as a general practice because it
These test methods are under the jurisdiction of ASTM Committee D13 on
Textiles and are the direct responsibility of Subcommittee D13.60 on Fabric Test
is too time consuming.
Methods, Specific.
6.1.1 In case of a dispute arising from differences in
Current edition approved July 1, 2019. Published July 2019. Originally approved
reported test values when using Test Methods D3773 for
in 1989. Last previous edition approved in 2014 as D3773 – 10 (2014). Replaces
acceptance testing of commercial shipments, the purchaser and
Sections 6 to 12 of Methods D1910 – 64 (1975), Test for Construction Character-
istics of Woven Fabrics. DOI: 10.1520/D3773_D3773M-10R19.
supplier should conduct comparative tests to determine if there
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
is a statistical bias between their laboratories. Competent
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
statistical assistance is recommended for the investigation of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. bias.As a minimum, the two parties should take a group of test
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D3773/D3773M − 10 (2019)
specimens which are as homogeneous as possible and which arc of contact between the fabric and the drum when necessary.
are from a lot of material of the type in question. The test The rollers should not touch the fabric in contact with the
specimens should then be randomly assigned in equal numbers drum.
to each laboratory for testing. The average results from the two 7.4.2 Read the length from the dial or counter geared to the
laboratories should be compared using Student’s t-test for drum. This reading represents the length measured under the
unpaired data and an acceptable probability level chosen by the tension existing while the fabric is running.
two parties before testing is begun. If a bias is found, either its 7.4.3 Calculate the average length for the lot.
cause must be found and corrected or the purchaser and the
supplier must agree to interpret future test results in the light of 8. Option C—Clock
the known bias.
8.1 Significance and Use—The clock option may be used
6.2 Apparatus: for measuring the length of a fabric for the purpose of
6.2.1 Flat Horizontal Surface, at least3m[3yd] long and acceptance testing, provided the user’s laboratory verifies for
having a width equal to or greater than the widest fabric to be the specific weave and construction of interest that results
measured. obtained by this test method agree within 60.5 % of those
6.2.2 Length-Measuring Device, metal rule or steel tape, 1 obtained by the hand method. Use the device on any machine
m [1 yd] minimum length graduated in 1 mm [ ⁄16 in.] units,
equipped to handle continuous lengths of fabric. In cases of
and dispute, the hand option shall be used.
6.2.3 Pins, suitable for use as markers.
8.2 Apparatus:
6.3 Sampling—Take a lot sample as directed in the material 8.2.1 Measuring Device , consisting of a pair of identical
specification or as agreed upon by the purchaser and seller. In
wheels, mounted 75 to 100 mm [3 to 4 in.] apart on a
the absence of such specification or agreement, all rolls or free-running common axle connected to a counting mechanism
pieces shall be measured. Consider rolls or bolts of fabric as
graduated to read in metres or decimetres [yards and eighths of
the primary sampling units. The lot sample also serves as the a yard]. The surfaces of the wheels are approximately 10 mm
laboratory sample and as the test specimens.
[ ⁄2 in.] wide and should be covered with cork or other suitable
friction material ground to a known circumference. Synchro-
6.4 Procedure:
nize the counting mechanism to this circumference so that it
6.4.1 Lay the fabric on a smooth horizontal surface. Fabric
will read in metres [yards].
mustlayflat,withouttension,andfreefromwrinklesandfolds.
8.2.2 Standard Roll, the length of which has been deter-
6.4.2 Using a minimum number of increments, measure
mined by the hand option.
successive lengths of fabric parallel to the selvage to the
nearest 1 mm [ ⁄16 in.], marking each length with pins. 8.3 Sampling—Sample as directed in 6.3.
6.4.3 Add the measurements to determine the length of the
8.4 Procedure:
fabric.
8.4.1 Mount the measuring device in such a way that the
movement of the fabric through the machine will turn the
7. Option B—Drum
wheels.
7.1 Significance and Use—Thedrumoptionmaybeusedfor 8.4.2 Run the fabric through the measuring device. Read the
measuring the length of a fabric for the purpose of acceptance length of fabric directly from the counter. This reading repre-
testing, provided the user’s laboratory verifies for the specific sents the length measured under the tension existing while the
weave and construction of interest that results obtained by this fabric is running.
test method agree within 60.5 % of those obtained by the hand 8.4.3 Calculate the average length for the lot.
option. In cases of dispute the hand option shall b
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