ASTM D7570-17(2021)e1

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.
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Designation: D7570 − 17 (Reapproved 2021)
Standard Test Method for
Evaluation of Dimensional Stability of Pile Yarn Floor
Covering
This standard is issued under the fixed designation D7570; 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.
ε NOTE—Research report information was added to Section 15 editorially in August 2021.
1. Scope E177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
1.1 This test method covers the determination of dimen-
E691 Practice for Conducting an Interlaboratory Study to
sional changes in the lengthwise and width-wise direction and
Determine the Precision of a Test Method
distortionlikelytooccurwhenpilefloorcoveringsareexposed
to various conditions of moisture and heat. This method is
3. Terminology
applicable to all pile floor coverings including carpet module
3.1 For all terminology relating to D13.21, Pile Yarn Floor
form.
Coverings, refer to Terminology D5684.
1.2 This method is applicable to machine made pile yarn
3.2 The following terms are relevant to this standard:
floor covering.
backing, carpet, dimensional stability, cut pile yarn floor
1.3 The values stated in inch-pound units are to be regarded
covering, finished pile yarn floor covering, floor covering,
as standard. The values given in parentheses are mathematical
lengthwise direction, pile yarn floor covering, textile floor
conversion to SI units that are provided for information only
covering, tufted fabric, widthwise direction
and are not considered standard.
3.3 For definitions of other terms related to textiles, refer to
1.4 This standard does not purport to address all of the
Terminology D123.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Test Method
priate safety, health, and environmental practices and deter-
4.1 This test method describes the dimensional stability of
mine the applicability of regulatory limitations prior to use.
machine made pile yarn floor coverings when subjected to
1.5 This international standard was developed in accor-
heat, water and various atmospheric conditions. The dimen-
dance with internationally recognized principles on standard-
sions of the specimen are measured in the original state and
ization established in the Decision on Principles for the
after each stage of conditioning in the lengthwise and width-
Development of International Standards, Guides and Recom-
wise directions. The change in the dimensions are determined
mendations issued by the World Trade Organization Technical
and reported to the nearest 0.001 in. (0.03 mm).
Barriers to Trade (TBT) Committee.
5. Significance and Use
2. Referenced Documents
5.1 The determination of dimensional change of pile yarn
2.1 ASTM Standards:
floor covering is useful in quality and cost control during
D123 Terminology Relating to Textiles
manufacture of pile yarn floor covering. The appearance and
D1776/D1776M Practice for Conditioning and Testing Tex-
performance may be affected by the changes in the dimensions
tiles
of pile yarn floor covering. This test method is considered
D5684 Terminology Relating to Pile Floor Coverings
satisfactory for acceptance testing of commercial shipment
because current estimates of between laboratory precision are
acceptable, and this method is commonly used in the trade for
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
and is the direct responsibility of Subcommittee D13.21 on Pile Floor Coverings.
acceptance testing.
Current edition approved July 1, 2021. Published August 2021. Originally
5.2 If there are differences of practical significance between
approved in 2009. Last previous edition approved in 2017 as D7570–17. DOI:
10.1520/D7570-17R21E01.
reported test results for two laboratories (or more), compara-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
tive tests should be performed to determine if there is a
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
statistical bias between them using competent statistical assis-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tance. As a minimum use the samples for such comparative
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7570 − 17 (2021)
tests that are as homogenous as possible, drawn from the same 9. Preparation of Apparatus
lot of material as the samples that resulted in disparate results
9.1 Thetestequipmentshallbeverifiedandanyadjustments
during initial testing and randomly assigned in equal numbers
made before starting each test cycle.
to each laboratory. The test results from the laboratories
9.2 Fill water basin with a solution of 0.1 % Sodium Lauryl
involved should be compared using a statistical test for
Sulfate as directed in step 6.4.
unpaired data, a probability level chosen prior to the testing
series. If a bias is found either its cause must be found and
10. Calibration and Standardization
corrected, or future test results for that material must be
10.1 Verification of the equipment should be made prior to
adjusted in consideration of the known bias.
starting of test using a certified ruler or gauge blocks traceable
to a national standard. Make any adjustments to the equipment
6. Apparatus
to assure accuracy of measuring device.
6.1 MeasuringDevice, capable of measuring a dimension to
11. Conditioning
an accuracy of 0.001 in. (0.03 mm). A loading plate made of
metal or glass with dimensions slightly smaller than the test
11.1 Conditionthespecimensortestsamplesinthestandard
specimen or any other device capable of keeping the specimen
atmosphere for testing textiles in accordance with Practice
flat during measurement of dimensional change.
D1776/D1776M.
6.2 Support Plate, with a dimension slightly larger than the
12. Procedure
test specimens on which to place specimen during measure-
12.1 Placethespecimenonthemeasuringdeviceforlength-
ment.
wise and widthwise direction. Place the loading plate on the
6.3 Laboratory Oven, with forced ventilation capable of
sample for ease of keeping the sample flat.Aminimum of two
maintaining a temperature of 140 °F 6 2 °F (60 °C 6 1 °C)
measurements for each direction of the specimen shall be
equipped with perforated racks or grids to permit free circula-
taken. The original measurements shall be marked with a
tion of air.
permanent waterproof marker along the edge to ensure all
6.4 Water– Basin, with dimensions slightly larger than the
measurements are repeated at the same point. The measure-
test specimens, filled with tap water at 68 °F 6 5 °F (20 °C 6
ments shall be taken at least 1 in. (25 mm) from each corner of
3 °C) containing 0.1 % Sodium Lauryl Sulfate.
the specimen. Measure to the nearest 0.001 in. (0.03 mm).
6.4.1 Weights, to allow full submersion of the specimen.
12.2 Place the specimen in a forced air oven for 2 h 6
NOTE 1—Water temperature in 6.4 does not need to be maintained.
15 min at 140 °F 6 2 °F (60 °C 6 1 °C).
6.5 Grids, to allow free circulation of air for conditioning.
12.3 After time in the oven has elapsed, remove the speci-
men from the oven.
7. Reagents and Materials
12.4 Place the sample in the water basin with the initial
7.1 Sodium Lauryl Sulfate 0.1%.
water temperature at 68 °F 6 5 °F (20 °C 6 3 °C) and sodium
lauryl sulfate solution for 2 h 6 15 min, allowing water
8. Sampling, Test Specimens, and Test Units
solution to cool to ambient temperature. If specimen floats in
8.1 Specimens presented for testing should be representa-
water, use a weighted object to keep the specimen submerged
tive of manufacturer production roll. If possible the specimen
in water.
shall be tested in the size that it was submitted in order to
12.5 Remove the specimen from the sodium lauryl sulfate
prevent skewing of specimen and test results. If specimen must
solution, avoid distorting the shape of the specimen. Excess
be cut to accommodate testing equipment such as ovens or
watermayberemovedbyplacingthespecimenbetweensheets
measuring apparatus it shall only be reduced to the minimal
of blotting paper.
size no sm
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