ASTM D4772-14(2019)

Standard Test Method for Surface Water Absorption of Terry Fabrics (Water Flow)

SIGNIFICANCE AND USE
5.1 This test method may be used to test the surface water absorption of terry fabrics for bath towels, bath sheets, hand towels, kitchen towels, dishcloths, washcloths, beachwear, bathrobes, and the like. Different specifications may be needed for each of these fabrics because of different applications.5  
5.2 It is recognized that surface water absorption is only one of the characteristics that the ultimate consumer may use in determining which terry fabric is acceptable. Consult Specification D5433 for other characteristics that may be applicable to terry fabrics.  
5.3 This test method is recommended for quality control testing of terry fabrics during manufacturing and product comparisons of different terry fabrics by manufacturers, retailers, and users.  
5.4 This test method may be used for the acceptance testing of commercial shipments of terry fabrics, but caution is advised since interlaboratory precision is known to be poor. Comparative tests as directed in 5.4.1 may be advisable.  
5.4.1 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 laboratory sampling units (such as towels) that are as homogeneous as possible and that are from a lot of material of the type in question. The laboratory sampling units should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using appropriate statistical analysis for unpaired data and an acceptable probability level chosen by the two parties before the testing is begun. If a bias is found, either its cause must be found and corrected or the purchaser and supplier must ag...
SCOPE
1.1 This test method determines the ability of a terry fabric to rapidly absorb and retain liquid water from surfaces such as human skin, dishes, and furniture.  
1.2 This test method is not applicable to non-terry fabrics such as huck towels, waffle-weave towels, crash towels, flour-sack towels, and nonwoven wipes. The steep angle of the specimen on the apparatus may cause a large amount of water to runoff these non-pile fabrics, or the lightweight/open structure of these fabrics may allow a large amount of water to completely pass through the specimen; thus the test result may not be a valid measure of a non-terry fabric's ability to absorb water.  
1.3 This test method is not applicable to decorative terry fabrics that will not be used to absorb water from surfaces.  
1.4 This test method is written in SI units. The inch-pound units that are provided are not necessarily exact equivalents of the SI units. Either system of units may be used in this test method. In case of referee decisions the SI units will prevail.  
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 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.

General Information

• Status: Published
• Publication Date: 30-Jun-2019
• ICS: 59.080.99 - Other products of the textile industry
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.59 - Fabric Physical Test Methods A

Relations

• Replaces: ASTM D4772-14 - Standard Test Method for Surface Water Absorption of Terry Fabrics (Water Flow)
• Effective Date: 01-Jul-2019
• Refers: ASTM D5433-12(2019) - Standard Performance Specification for Towel Products for Institutional and Household Use
• Effective Date: 15-Jan-2019
• Refers: ASTM D123-17 - Standard Terminology Relating to Textiles
• Effective Date: 01-Mar-2017
• Refers: ASTM D123-15b - Standard Terminology Relating to Textiles
• Effective Date: 15-Sep-2015
• Refers: ASTM D123-15a - Standard Terminology Relating to Textiles
• Effective Date: 01-Sep-2015
• Refers: ASTM D123-15 - Standard Terminology Relating to Textiles
• Effective Date: 01-Apr-2015
• Refers: ASTM D3136-14 - Standard Terminology Relating to Care Labeling for Apparel, Textile, Home Furnishing, and Leather Products
• Effective Date: 15-May-2014
• Refers: ASTM D3136-13 - Standard Terminology Relating to Care Labeling for Apparel, Textile, Home Furnishing, and Leather Products
• Effective Date: 01-Jul-2013
• Refers: ASTM D3136-13e1 - Standard Terminology Relating to Care Labeling for Apparel, Textile, Home Furnishing, and Leather Products
• Effective Date: 01-Jul-2013
• Refers: ASTM D123-13ae1 - Standard Terminology Relating to Textiles
• Effective Date: 15-Jun-2013
• Refers: ASTM D123-13a - Standard Terminology Relating to Textiles
• Effective Date: 15-Jun-2013
• Refers: ASTM D123-13 - Standard Terminology Relating to Textiles
• Effective Date: 15-May-2013
• Refers: ASTM D5433-12 - Standard Performance Specification for Towel Products for Institutional and Household Use
• Effective Date: 01-Jun-2012
• Refers: ASTM D123-12 - Standard Terminology Relating to Textiles
• Effective Date: 01-Feb-2012
• Refers: ASTM D123-12e1 - Standard Terminology Relating to Textiles
• Effective Date: 01-Feb-2012

Overview

ASTM D4772-14(2019): Standard Test Method for Surface Water Absorption of Terry Fabrics (Water Flow) specifies a laboratory procedure for measuring how quickly and efficiently terry fabrics absorb and retain liquid water from surfaces such as skin, dishes, and furniture. Developed by ASTM International, this textile testing standard ensures that manufacturers, suppliers, and retailers of terry towels, bathrobes, kitchen towels, washcloths, bath sheets, beach towels, and similar products can consistently assess surface water absorption performance.

This standard is intended for use in quality control, product comparison, and, with caution regarding precision, for the acceptance testing of commercial shipments. The method focuses exclusively on terry fabrics and is not applicable to non-terry or decorative fabrics that are not designed for water absorption.

Key Topics

• Applicability: This method applies to terry fabrics such as bath towels, hand towels, dishcloths, washcloths, bathrobes, beachwear, and similar textile products.
• Testing Procedure: The fabric is preconditioned, conditioned, and mounted on the test apparatus at a specified angle. Water is allowed to flow down the sample, and the absorbed versus runoff water is precisely measured.
• Sampling and Preparation: The test ensures that samples are conditioned under controlled humidity and temperature, and may be prepared either as finished textile products (e.g., hemmed towels) or as fabric pieces.
• Precision and Bias: Results can be used for comparative testing among products and batches, but users are advised about limited interlaboratory precision. Comparative tests may be necessary when disputes arise.
• Units and Reporting: The test method is written in SI units; inch-pound units are provided as reference. Reports must state the preparation method, number and size of samples, and absorption results for both face and back sides.
• Safety and Compliance: The standard emphasizes the responsibility of users to adhere to all relevant safety, health, and environmental practices.

Applications

ASTM D4772-14(2019) is valuable across the textile and home goods industries wherever terry fabrics are designed for water absorption. Typical applications include:

• Quality Control: Manufacturers rely on this test to verify that terry fabric batches meet required absorption benchmarks before shipment or retail distribution.
• Product Comparison: Brands and retailers use the results to compare the performance of different terry products, aiding in selection for private labels or vendor qualification.
• Acceptance Testing: While advised to be conducted with caution, this method can be used for verifying delivered goods against contractual water absorption criteria.
• Research and Development: Textile and materials engineers use the test method to optimize pile fabric design, improve finishing processes, and develop innovative, more absorbent terry products.

Related Standards

Other standards and resources referenced in or relevant to ASTM D4772-14(2019) include:

• ASTM D5433: Performance Specification for Towel Products for Institutional and Household Use - covers additional required towel characteristics.
• ASTM D3136: Terminology Relating to Care Labeling for Apparel, Textile, Home Furnishing, and Leather Products - for standardized textile definitions.
• AATCC Test Method 135: Evaluates dimensional changes in woven and knit fabrics during laundering.
• ASTM D123: Terminology Relating to Textiles - foundational textile vocabulary.
• ASTM D1776: Practice for Conditioning and Testing Textiles - protocols for sample conditioning.
• ASTM D2904 (withdrawn): Practice for Interlaboratory Testing of a Textile Test Method That Produces Normally Distributed Data.

By following ASTM D4772-14(2019), textile professionals can ensure their terry fabric products consistently deliver high surface water absorption performance, supporting consumer satisfaction and product compliance. This enhances market trust and helps maintain rigorous quality standards in household and institutional textiles.

Standards Content (Sample)

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: D4772 − 14 (Reapproved 2019)
Standard Test Method for
Surface Water Absorption of Terry Fabrics (Water Flow)
This standard is issued under the fixed designation D4772; 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 D1776 Practice for Conditioning and Testing Textiles
D2904 Practice for Interlaboratory Testing of a Textile Test
1.1 This test method determines the ability of a terry fabric
Method that Produces Normally Distributed Data (With-
to rapidly absorb and retain liquid water from surfaces such as
drawn 2008)
human skin, dishes, and furniture.
D2906 Practice for Statements on Precision and Bias for
1.2 This test method is not applicable to non-terry fabrics 3
Textiles (Withdrawn 2008)
such as huck towels, waffle-weave towels, crash towels,
D3136 Terminology Relating to Care Labeling for Apparel,
flour-sack towels, and nonwoven wipes. The steep angle of the
Textile, Home Furnishing, and Leather Products
specimen on the apparatus may cause a large amount of water
D5433 Performance Specification for Towel Products for
to runoff these non-pile fabrics, or the lightweight/open struc-
Institutional and Household Use
ture of these fabrics may allow a large amount of water to
2.2 AATCC Standard:
completely pass through the specimen; thus the test result may
Test Method 135 Dimensional Changes in Automatic Home
not be a valid measure of a non-terry fabric’s ability to absorb
Laundering of Woven and Knit Fabrics
water.
3. Terminology
1.3 This test method is not applicable to decorative terry
3.1 For all terminology related to Subcommittee D13.59 on
fabrics that will not be used to absorb water from surfaces.
Fabric Test Methods see Terminology D3136.
1.4 This test method is written in SI units. The inch-pound
3.2 The following terms are relevant to this standard:
units that are provided are not necessarily exact equivalents of
the SI units. Either system of units may be used in this test absorption, pile, surface water absorption, terry fabric.
method. In case of referee decisions the SI units will prevail.
3.3 For definitions of other textile terms see Terminology
1.5 This standard does not purport to address all of the D123.
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 Aterry fabric product with hems or with both hems and
priate safety, health, and environmental practices and deter-
selvages (such as a bath towel), or a terry fabric without hems
mine the applicability of regulatory limitations prior to use.
or without both hems and selvages (such as a terry fabric cut
1.6 This international standard was developed in accor-
from a roll) is prepared for testing by preconditioning and
dance with internationally recognized principles on standard-
conditioning. Specimens are placed one at a time in an
ization established in the Decision on Principles for the
embroidery hoop and then the hoop/specimen assembly is
Development of International Standards, Guides and Recom-
placed at an angle on the base of the apparatus. After water
mendations issued by the World Trade Organization Technical
flows down the surface of each specimen, the amount of water
Barriers to Trade (TBT) Committee.
retained by each specimen is measured. Six specimens are
2. Referenced Documents
tested, three on the face of the fabric and three on the back of
2.1 ASTM Standards:
the fabric. The six observations are averaged to determine the
D123 Terminology Relating to Textiles
surface water absorption of the fabric.
5. Significance and Use
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
and is the direct responsibility of Subcommittee D13.59 on Fabric Test Methods,
5.1 This test method may be used to test the surface water
General
absorption of terry fabrics for bath towels, bath sheets, hand
Current edition approved July 1, 2019. Published July 2019. Originally approved
in 1988. Last previous edition approved in 2014 as D4772 – 14. DOI: 10.1520/
D4772-14R19. The last approved version of this historical standard is referenced on
For referenced ASTM standards, visit the ASTM website, www.astm.org, or www.astm.org.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Available from American Association of Textile Chemists and Colorists
Standards volume information, refer to the standard’s Document Summary page on (AATCC), P.O. Box 12215, Research Triangle Park, NC 27709, http://
the ASTM website. www.aatcc.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D4772 − 14 (2019)
towels, kitchen towels, dishcloths, washcloths, beachwear,
bathrobes, and the like. Different specifications may be needed
for each of these fabrics because of different applications.
5.2 Itisrecognizedthatsurfacewaterabsorptionisonlyone
of the characteristics that the ultimate consumer may use in
determining which terry fabric is acceptable. Consult Specifi-
cationD5433forothercharacteristicsthatmaybeapplicableto
terry fabrics.
5.3 This test method is recommended for quality control
testing of terry fabrics during manufacturing and product
comparisons of different terry fabrics by manufacturers,
retailers, and users.
5.4 This test method may be used for the acceptance testing
of commercial shipments of terry fabrics, but caution is
advised since interlaboratory precision is known to be poor.
Comparative tests as directed in 5.4.1 may be advisable.
5.4.1 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 sup-
plier should conduct comparative tests to determine if there is
a statistical bias between their laboratories. Competent statis-
tical assistance is recommended for the investigation of bias.
As a minimum, the two parties should take a group of
laboratory sampling units (such as towels) that are as homo-
geneous as possible and that are from a lot of material of the
type in question. The laboratory sampling units should then be
A = Hoop,
randomly assigned in equal numbers to each laboratory for
B = Base,
testing.Theaverageresultsfromthetwolaboratoriesshouldbe
C = Funnel,
D = Valve,
compared using appropriate statistical analysis for unpaired
E = Graduate,
data and an acceptable probability level chosen by the two
F = Pour Spout,
parties before the testing is begun. If a bias is found, either its
G = Pan, and
H = Adjustment Screw.
cause must be found and corrected or the purchaser and
FIG. 1 Schematic Diagram of a Typical Water Flow Tester
supplier must agree to interpret future test results with consid-
eration of the known bias.
6. Apparatus and Materials
6.1.3 The funnel, valve, fittings, tubing, and graduate
6.1 Water Flow Tester —Although this tester is commer-
mounted on the apparatus (see Fig. 2) must not restrict the flow
cially available, it is not difficult or expensive to build. The
of water. The time between the opening of the valve and the
tester shown in Figs. 1-3 can be made from the parts and the
time the water has exited the graduate (except for a few drops)
series of steps described in AnnexA1; however, there are other
must be less than 8.0 s. (The tester shown in Figs. 2 and 3 has
acceptable ways to build the tester. Sections 6.1.1 – 6.1.4
a mean of 5.7 s and a standard deviation of 0.5 s).
indicate the critical factors which must be incorporated into the
6.1.4 The hoop/specimen assembly must be mounted on the
design of the tester.
base in a manner to direct all water not absorbed by the
6.1.1 The hoop/specimen assembly must be at 1.1 rad (60°)
specimen toward the pan (see Figs. 1-3). It is especially
to the table top (see Fig. 1 and Fig. 3).
important that any water that passes completely through the
6.1.2 The 50-mL graduate mounted on the apparatus must
specimen is directed toward the pan and is not allowed to be
be parallel to the table top (see Figs. 1 and 2). The pour spout
absorbed by the lower portion of the specimen, or the edge of
on this graduate must be 3.0 6 0.2 cm (1.18 6 0.08 in.) down
the laboratory sampling unit, or held where the hoop contacts
from where the adjustment screw bracket joints the outer hoop
the base.
and 0.6 6 0.4 cm (0.24 6 0.16 in.) away from the hoop/
6.2 Embroidery Hoop, 15.3-cm (6-in.) outer diameter of
specimen assembly (see Fig. 1 and Fig. 3).
inner hoop. If the hoop is made of wood, it must have a
water-resistant finish (such as a marine varnish).
The relationship between water and textiles is complex. For information on the
6.3 Graduate, Polymethylpentene (PMP) 50 mL.
different forms of interaction between water and textiles see: Zeronian, S. H.
“Analysis of the Interaction Between Water and Textiles,” pages 117–128 in 6.4 Distilled or Deionized Water, at 21 6 1°C (70 6 2°F).
Analytical Methods for a Textile Laboratory, American Association of Textile
6.5 Laboratory Sampling Unit Conditioning Equipment,
Chemists and Colorists, third edition, 1984, edited by J. W. Weaver.
Apparatus is commercially available. facilities such as a multiple shelf/rod conditioning rack (for
D4772 − 14 (2019)
FIG. 2 A Typical Water Flow Tester
FIG. 3 The Water Flow Tester with the Laboratory Sampling Unit
in Place
example see Practice D1776) or a clothesline and clothespins.
For more information see 9.2.
6.6 Tumble Dryer, equivalent to the one described in provide a sampling plan with a meaningful producer’s risk, consumer’s
risk, acceptable quality level, and limiting quality level.
AATCC Test Method 135.
7.2 Laboratory Sample—As a laboratory sample for accep-
6.7 Washing Machine, equivalent to the one described in
tance testing, take the number of laboratory sampling units
AATCC Test Method 135.
specified in the agreement between the purchaser and the
6.8 Detergent, heavy duty granule, equivalent to The 1993
supplier. Take the laboratory sampling units as follows:
AATCC Standard Reference Detergent described in AATCC
7.2.1 Recommended Laboratory Sampling Unit—Because
Test Method 135 or any detergent agreed upon by the pur-
this is a nondestructive test method, the recommended labora-
chaser and the supplier that does not include fabric softener or
tory sampling unit is a terry fabric product with hems or with
bleach.
both hems and selvages (such as a bath towel). The fabric
shouldbedyedandfinishedastheconsumerwouldpurchaseit.
7. Sampling
A fabric approximately 112 (lengthwise direction) by 56 cm
7.1 LotSample—Asalotsampleforacceptancetesting,take
(44 by 22 in.) or larger is easier to test than a small fabric as all
at random the number of shipping cartons or the number of
six observations can be made on one fabric, but the procedure
rollsoffabricdirectedinanapplicablematerialspecificationor
allows for testing a small fabric such as a hand towel (see Note
other agreement between the purchaser and the supplier.
2).
Consider shipping cartons or rolls of fabric to be the primary
NOTE 2—A 20.0 by 20.0-cm (7.87 by 7.87-in.) fabric is the smallest
sampling units, see Note 1.
laboratory sampling unit that can be tested on the apparatus. Six of these
NOTE 1—Any agreement between the purchaser and supplier must take small laboratory sampling units will be needed to provide the six
into account the variability between rolls, bolts, or pieces of fabric and observations. In choosing the size of the laboratory sampling unit, keep in
between specimens from a swatch of fabric from a roll, bolt, or piece, or mind that terry fabric has a high degree of shrinkage during washing and
between cartons of garments and between garments within a carton, to drying.
D4772 − 14 (2019)
7.2.2 Alternate Laboratory Sampling Unit—As an alterna-
tive to the procedure described in 7.2.1, a terry fabric without
hems or without both hems and selvages can be used (such as
a terry fabric cut from a roll). The fabric should be dyed and
finished as the consumer would purchase it. A fabric approxi-
mately 112 (lengthwise direction) by 56 cm (44 by 22 in.) or
larger is easier to test than a small fabric as all six observations
can be made on one fabric, but the procedure allows for testing
a small fabric (see Note 2).
7.3 Specimens—After the laboratory sampling unit(s) has
been prepared as directed in Section 8 and conditioned as
directed in Section 9, take six specimens (the area inside the
hoop) by locating the hoop on the laboratory sampling unit(s)
as follows:
7.3.1 Foralaboratorysamplingunit(s)thatisapproximately
112 (lengthwise direction) by 56 cm (44 by 22 in.) or larger,
locate the hoop as shown in Fig. 4.
7.3.2 For a laboratory sampling unit(s) that is not large
enough to locate the hoop so that all six specimens are on one
laboratory sampling unit, alternate the hoop from face to back
using as many laboratory sampling units as needed to obtain
the six specimens.
8. Preparation of the Laboratory Sampling Unit
8.1 Recommended Preparation of the Laboratory Sampling
Unit—The recommended preparation of the laboratory sam-
FIG. 4 Location of the Hoop for a Large Laboratory Sampling
Unit Such as a Bath Towel
pling unit uses a dryer to precondition the laboratory sampling
unit and raise the pile so it is not matted down. See 6.6 for a
description of the dryer. The procedure is as follows:
8.1.1 If fabric softener has recently been used in the dryer,
purchaser and the supplier, however, must agree on the number
dry a 3.6-kg (8-lb) dummy load of desized unsoftened fabrics
of washing and drying cycles. This procedure may cause more
which will not be tested, and then repeat this procedure with a
variation in the test result than the procedure described in 8.1
different dummy load of 3.6 kg (8 lb) of desized unsoftened
and it is not recommended for acceptance testing unless there
fabrics.
has been an agreement between the purchaser and the supplier.
8.1.2 Clean the lint filter.
This procedure uses the equipment and the supplies described
8.1.3 Load the dryer with laboratory sampling units that
in 6.6 – 6.8. The procedure is as follows:
comprise a homogeneous load (for example, same
8.2.1 If fabric softener has recently been used in the washer
manufacturer, same line, same finishing, and same previous
or dryer, wash or dry or both a 3.6-kg (8-lb) dummy load of
care). It is not necessary to have a full load in the dryer, so it
desized unsoftened fabrics which will not be tested, and then
is acceptable to load only one laboratory sampling unit into the
repeat this procedure with a different dummy load of 3.6 kg (8
dryer.
lb) of desized unsoftened fabrics.
8.1.4 Select normal cycle, medium temperature (see Termi-
8.2.2 If the washer has a lint filter, clean the lint filter.
nology D3136, and AATCC Test Method 135), and run the
8.2.3 Load the washer with a 3.6-kg (8-lb) load of labora-
dryer for 20 min. Do not use fabric softener during this
tory sampling units that comprise a homogeneous load (for
procedure.
example, same manufacturer, same line, same finishing, and
8.1.5 Ifthelaboratorysamplingunit(s)wasoriginallydamp,
same previous care) or a homogeneous group of laboratory
keep drying it for 10-min cycles until the fabric(s) is dry to the
sampling units for testing and a desized unsoftened group of
touch. Do not overdry the fabric(s).
dummy fabrics to make a 3.6-kg (8-lb) load.
8.2.4 Selectnormalcycle,warmwatertemperature,andThe
8.2 Alternate Preparation of the Laboratory Sampling
1993 AATCC Standard Reference Detergent or equivalent
Unit—Thealternatepreparationofthelaboratorysamplingunit
detergent (see Terminology D3136, and AATCC Test
uses one cycle of washing and drying. This preconditions the
Method 135). If agreed upon by the purchaser and the supplier,
laboratory sampling unit, raises the pile so it is not matted
other detergents and conditions are possible. Run one machine
down, and removes some chemicals. Other numbers of wash-
cycle and do not use softener.
ing and drying cycles, such as three or five, may be used. The
8.2.5 Load the dryer with the washed fabrics. Clean the lint
filter. Select normal cycle, medium temperature, and run the
dryerfor20minoruntilthefabricsaredrytothetouch.Donot
Dummy loads of fabrics may be comprised of desized unsoftened non-terry
fabrics or terry fabrics. use softener in the dryer. Do not overdry the fabrics.
D4772 − 14 (2019)
9. Conditioning being neither tight enough to distort the fabric nor loose
enough that the fabric sags. Position the outer ring of the hoop
9.1 Bothpreconditioningandconditioningarerequired.The
so it is not higher than the specimen and thus it does not trap
dryer in 8.1 and 8.2 will precondition the laboratory sampling
water between it and the specimen.
unit(s). Conditioning of the laboratory sampling unit(s) is
described in 9.2. 10.5 Mount the hoop/specimen assembly on the base. Ex-
cess laboratory sampling unit must be allowed to drape over
9.2 Immediately after taking the laboratory sampling unit(s)
the sides and the back of the base (see Fig. 3).
out of the dryer, place it in the conditioning room. If the
laboratory sampling unit(s) is to be cut to a smaller size agreed 10.6 Position the hoop/specimen assembly (see Figs. 1 and
upon by the purchaser and the supplier (optional), the labora- 3) so that the bottom of the pour spout is 0.6 6 0.4 cm (0.24
tory sampling unit(s) must be cut before conditioning. Remove 6 0.16 in.) away from the specimen, 3.0 6 0.2 cm (1.18 6
lintfromthelaboratorysamplingunit(s)bylightlybrushingthe 0.08 in.) down from where the adjustment screw bracket joins
surface with a clothes brush. During conditioning, hang the the outer hoop, and centered between the sides of the hoop.
laboratory sampling unit(s) on a line or rod, or lay it flat on a
10.7 Push the pan against the base so all the water will go
shelf, or place it on a conditioning rack in a conditioning room
into the pan.
so that at least one side is fully exposed to the standard
10.8 Whilethevalveisinaclosedposition,pour50 61mL
atmosphere for testing textiles, which is 21 6 1°C (70 6 2°F)
of distilled or deionized water at 21 6 1°C (70 6 2°F) into the
and 65 6 2 % relative humidity. At no time during condition-
graduate which is not attached to the apparatus and then pour
ingshouldthelaboratorysamplingunit(s)befoldedorstacked.
this water into the funnel. Open the valve and allow the water
About halfway through conditioning, turn over the laboratory
to run down the surface of the specimen held in the hoop.
sampling unit(s) so both sides will have had contact with the
Collect the water in the pan.Allow 25 6 5 s to elapse between
conditioned air. Allow the laboratory sampling unit(s) to
the time the water stops coming out of the graduate attached to
condition for a minimum of 24 h and a maximum of 48 h
the apparatus and the removal of the pan. Do not tap on or tilt
before testing.The reason for the maximum time is terry fabric
the graduate attached to the apparatus to try to get all the drops
is able to pick up excess moisture from humid moving air and
of water out.
thus it can achieve a somewhat damp condition. If the
maximum time has been exceeded, the procedure directed in
10.9 Pour the runoff water, which is now in the pan, into the
8.1 and Section 9 must be repeated. 50-mL graduate not attached to the apparatus and record the
number of millilitres of runoff water to the nearest 1.0 mL.
10. Procedure
Subtract the number of millilitres of runoff water from 50 and
10.1 Test the conditioned laboratory sampling unit(s) in the record this value as the observation.Also record the side of the
laboratory sampling unit on which this observation was taken.
standard atmosphere for testing textiles, which is 21 6 1°C (70
6 2°F) and 65 6 2 % relative humidity. Discard the water now in the graduate not attached to the
apparatus. Do not reuse this water.
10.2 Place the apparatus (Figs. 1-3) on a flat surface where
10.10 Remove the laboratory sampling unit from the hoop.
spilled water will not cause a problem.
Do not allow the tested wet area(s) of the laboratory sampling
10.3 With no laboratory sampling unit on the base, pre-wet
unit to contact untested dry area(s). Thoroughly dry the hoop,
the graduate attached to the apparatus by using the following
the base, and the pan. If any water has missed the pan and is
procedure. While the valve is in a closed position, pour 50 6
now on the surface below the apparatus, this observation is not
1 mL of distilled or deionized water at 21 6 1°C (70 6 2°F)
valid and the procedure will have to be repeated on a dry area
in th
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