ASTM D7570-09
(Test Method)Standard Test Method for Evaluation of Dimensional Stability of Pile Yarn Floor Covering
Standard Test Method for Evaluation of Dimensional Stability of Pile Yarn Floor Covering
SIGNIFICANCE AND USE
The determination of dimensional change of pile yarn floor covering is useful in quality and cost control during manufacture of pile yarn floor covering. The appearance and performance may be affected by the changes in the dimensions of pile yarn floor covering. This test method is considered 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 acceptance testing.
If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them using competent statistical assistance. As a minimum use the samples for such comparative tests that are as homogenous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing and randomly assigned in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, a probability level chosen prior to the testing series. If a bias is found either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.
SCOPE
1.1 This test method covers the determination of dimensional changes in the lengthwise and widthwise direction and distortion likely to occur when pile floor coverings are exposed to various conditions of moisture and heat. This method is applicable to all pile floor coverings including carpet module form.
1.2 This method is applicable to machine made pile yarn floor covering.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversion to SI units that are proveded for information only and are not considered standard.
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.
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Standards Content (Sample)
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Designation: D7570 − 09
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.
1. Scope 3.2 The following terms are relevant to this standard:
backing, carpet, dimensional stability, cut pile yarn floor
1.1 This test method covers the determination of dimen-
covering, finished pile yarn floor covering, floor covering,
sional changes in the lengthwise and widthwise direction and
lengthwise direction, pile yarn floor covering, textile floor
distortion likely to occur when pile floor coverings are exposed
covering, tufted fabric, widthwise direction
to various conditions of moisture and heat. This method is
applicable to all pile floor coverings including carpet module
3.3 For definitions of other terms related to textiles, refer to
form.
Terminology D123.
1.2 This method is applicable to machine made pile yarn
4. Summary of Test Method
floor covering.
4.1 This test method describes the dimensional stability of
1.3 The values stated in inch-pound units are to be regarded
machine made pile yarn floor coverings when subjected to
as standard. The values given in parentheses are mathematical
heat, water and various atmospheric conditions. The dimen-
conversion to SI units that are proveded for information only
sions of the specimen are measured in the original state and
and are not considered standard.
after each stage of conditioning in the lengthwise and width-
1.4 This standard does not purport to address all of the
wise directions. The change in the dimensions are determined
safety concerns, if any, associated with its use. It is the
and reported to the nearest .001 in. (.03 mm).
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use.
5.1 The determination of dimensional change of pile yarn
2. Referenced Documents
floor covering is useful in quality and cost control during
manufacture of pile yarn floor covering. The appearance and
2.1 ASTM Standards:
performance may be affected by the changes in the dimensions
D123 Terminology Relating to Textiles
of pile yarn floor covering. This test method is considered
D1776 Practice for Conditioning and Testing Textiles
satisfactory for acceptance testing of commercial shipment
D5684 Terminology Relating to Pile Floor Coverings
because current estimates of between laboratory precision are
E177 Practice for Use of the Terms Precision and Bias in
acceptable, and this method is commonly used in the trade for
ASTM Test Methods
acceptance testing.
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
5.2 If there are differences of practical significance between
reported test results for two laboratories (or more), compara-
3. Terminology
tive tests should be performed to determine if there is a
statistical bias between them using competent statistical assis-
3.1 For all terminology relating to D13.21, Pile Yarn Floor
tance. As a minimum use the samples for such comparative
Coverings, refer to Terminology D5684.
tests that are as homogenous as possible, drawn from the same
lot of material as the samples that resulted in disparate results
during initial testing and randomly assigned in equal numbers
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
to each laboratory. The test results from the laboratories
and is the direct responsibility of Subcommittee D13.21 on Pile Floor Coverings.
involved should be compared using a statistical test for
Current edition approved Sept. 1, 2009. Published February 2010. DOI:
10.1520/D7570-09.
unpaired data, a probability level chosen prior to the testing
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
series. If a bias is found either its cause must be found and
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
corrected, or future test results for that material must be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. adjusted in consideration of the known bias.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7570 − 09
6. Apparatus 11. Conditioning
6.1 MeasuringDevice, capable of measuring a dimension to 11.1 Condition the specimen as directed in practice Practice
an accuracy of 0.001 in. (0.03 mm). A loading plate made of D1776 in standard atmosphere for testing textile, which is 70°
metal or glass with dimensions slightly smaller than the test 6 2° F (21 61°C)at65 6 2% relative humidity before
specimen or any other device capable of keeping the specimen starting the test.
flat during measurement of dimensional change.
12. Procedure
6.2 Support Plate, with a dimension slightly larger than the
test specimens on which to place specimen during measure- 12.1 Placethespecimenonthemeasuringdeviceforlength-
ment. wise and widthwise direction. Place the loading plate on the
sample for ease of keeping the sample flat.Aminimum of two
6.3 Laboratory Oven, with forced ventilation capable of
measurements for each direction of the specimen shall be
maintaining a temperature of 140° 6 2° F (60 6 1 °C)
taken. The original measurements shall be marked with a
equipped with perforated racks or grids to permit free circula-
permanent waterproof marker along the edge to ensure all
tion of air.
measurements are repeated at the same point. The measure-
6.4 Water– Basin, with dimensions slightly larger than the
ments shall be taken at least 1 in. (25 mm) from each corner of
test specimens, filled with tap water at 68 6 2° F (20 61°C
the specimen. Measure to the nearest 0.001in. (0.03mm).
) containing 0.1 % Sodium Lauryl Sulfate.
12.2 Place the specimen in a forced air oven for 2 h 6 15
6.4.1 Weights, to allow full submersion of the specimen.
min at 140 6 2° F (60 61° 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
7.1 Sodium Lauryl Sulfate 0.1%. 12.4 Place the sample in the water basin with the water and
sodium lauryl sulfate solution for 2 h 6 15 min. If specimen
8. Sampling, Test Specimens, and Test Units
floats in water, use a weighted object to keep the specimen
submerged in water.
8.1 Specimens presented for testing should be representa-
tive of manufacturer production roll. If possible the specimen
12.5 Remove the specimen from the sodium lauryl sulfate
shall be tested in the size that it was submitted in order to
solution , avoid distorting the shape of the specimen. Excess
prevent skewing of specimen and test results. If specimen must
watermayberemovedbyplacingthespecimenbetweensheets
be cut to accommodate testing equipment such as ovens or
of blotting paper.
measuring apparatus it shall only be reduced to the minimal
12.6 Place the wet specimen in the forced air oven at 140
size no smaller than 18 in. x 18 in. to meet these requirements.
6 2° F (60 6 1 ° C) for 24 h 6 30 min and allow it to dry.
8.2 The specimen shall have clear identification on it to
12.7 Place the specimen on the grids for conditioning in a
identify the machine direction.
controlled atmosphere at 70 62°F(216 1º C), 65 6 2%
8.3 Fortestsamples120in.(3000mm)wideorwider,three
relative humidity for a minimum of 48 hand repeat measuring
test specimens are required for a test method, one at each edge
instructions as directed in 12.1.
or no nearer the edge than 5% of the total floor covering width
and one in the middle portion of the laboratory sampling unit.
13. Calculation
For test samples at least 60 in. (1500 mm) wide but less than
13.1 Calculate the measurement of the dimensional
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