ASTM D1653-03(2008)
(Test Method)Standard Test Methods for Water Vapor Transmission of Organic Coating Films
Standard Test Methods for Water Vapor Transmission of Organic Coating Films
SIGNIFICANCE AND USE
One of the factors affecting the performance provided by an organic coating is its capability of resisting or aiding the passage of water vapor. In some services, for example, exterior wood and masonry, the coating has to allow moderate amounts of water vapor to pass through the film without damage to it. Hence, the water vapor transmission characteristics of coatings are important in assessing their performance in practical use.
The purpose of these test methods is to obtain values of water vapor transfer through coatings that range in permeability from high to low. These values are for use in design, manufacture, and marketing.
The water vapor transmission is not a linear function of film thickness, temperature or relative humidity.
Values of water vapor transmission rate (WVT) and water vapor permeance (WVP) can be used in the relative rating of coatings only if the coatings are tested under the same closely controlled conditions of temperature and relative humidity, and if their thicknesses are equal.
Test Method A—The Dry Cup Method is the preferred test method for obtaining values that relate to conventional dwellings where high relative humidities are not anticipated.
Test Method B—The Wet Cup Method is the preferred test method for obtaining values that relate to applications where high relative humidities are anticipated in the vicinity of the barrier material. In general, the more permeable a coating is to the passage of moisture as is typical of many water-reducible coatings, the greater its affinity for water and the greater the increase in transmission when tested in and exposed to high humidities. Absorption of water may make a coating less dense, thus allowing moisture to diffuse easily and cause a much higher moisture vapor transmission rate, (WVTR) than would occur in drier environments.
SCOPE
1.1 These test methods cover the determination of the rate at which water vapor passes through films of paint, varnish, lacquer, and other organic coatings. The films may be free films or they may be applied to porous substrates.
1.2 Two test methods are covered as follows:
1.2.1 Test Method A—Dry Cup Method, and
1.2.2 Test Method B—Wet Cup Method.
1.2.3 Agreement should not be expected between results obtained by different methods or test conditions. The method that most closely approaches the conditions of use should be selected.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Factors for conversion are stated in 13.2.1.2 and 13.2.2.2.
1.4 This standard does not purport to address 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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Designation: D1653 − 03 (Reapproved2008)
Standard Test Methods for
Water Vapor Transmission of Organic Coating Films
This standard is issued under the fixed designation D1653; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope E104Practice for Maintaining Constant Relative Humidity
by Means of Aqueous Solutions
1.1 Thesetestmethodscoverthedeterminationoftherateat
which water vapor passes through films of paint, varnish,
3. Terminology
lacquer,andotherorganiccoatings.Thefilmsmaybefreefilms
3.1 Definitions of Terms Specific to This Standard:
or they may be applied to porous substrates.
3.1.1 water vapor transmission rate, WVT, n—the steady
1.2 Two test methods are covered as follows:
water vapor flow in unit time through unit area of a body,
1.2.1 Test Method A—Dry Cup Method, and
between two specific parallel surfaces, under specific condi-
1.2.2 Test Method B—Wet Cup Method.
tions of temperature and humidity at each surface. Accepted
1.2.3 Agreement should not be expected between results
inch-poundunitisgrainspersquarefootperhour.AcceptedSI
obtained by different methods or test conditions. The method
unit is grams per square metre per 24 h.
that most closely approaches the conditions of use should be
3.1.2 water vapor permeance, WVP, n—the steady water
selected.
vapor flow in unit time through unit area of a body (WVT)
1.3 Thevaluesstatedininch-poundunitsaretoberegarded
inducedbyunitvaporpressuredifference(∆p)betweenthetwo
as standard. The values given in parentheses are mathematical
surfaces of a coating. Therefore, WVP=WVT/∆ p. Accepted
conversions to SI units that are provided for information only
inch-pound unit is grains per square foot per hour per inch of
and are not considered standard. Factors for conversion are
mercury (called a perm).Accepted SI unit is grams per square
stated in 13.2.1.2 and 13.2.2.2.
metre per 24 h per millimetre of mercury (called a metric
1.4 This standard does not purport to address the safety perm).
concerns, if any, associated with its use. It is the responsibility
4. Summary of Test Methods
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
4.1 In Test MethodA(Dry Cup Method), the test specimen
limitations prior to use. is sealed to the open mouth of a cup or dish containing
desiccant, and the assembly placed in a test chamber with a
2. Referenced Documents
controlled atmosphere. Two sets of exposure conditions are
2.1 ASTM Standards:
acceptable for this test method.
D823Practices for Producing Films of Uniform Thickness
4.1.1 Condition A, consisting of 50% relative humidity at
of Paint, Varnish, and Related Products on Test Panels
73°F (23°C), and
D1005Test Method for Measurement of Dry-Film Thick-
4.1.2 Condition B, consisting of 90% relative humidity at
ness of Organic Coatings Using Micrometers
100°F (38°C).
D1193Specification for Reagent Water
4.2 In Test Method B (Wet Cup Method), the test specimen
D4708Practice for Preparation of Uniform Free Films of
is sealed to the open mouth of a cup or dish containing water,
Organic Coatings
and the assembly placed in a test chamber with a controlled
atmosphere.Twosetsofexposureconditionsareacceptablefor
These test methods are under the jurisdiction of ASTM Committee D01 on
this test method:
Paint and Related Coatings, Materials, and Applications and are the direct
4.2.1 Condition A, consisting of 50% relative humidity at
responsibility of Subcommittee D01.23 on Physical Properties of Applied Paint
Films.
73°F (23°C), and
Current edition approved June 1, 2008. Published June 2008. Originally
4.2.2 Condition C, consisting of very low (near zero)
approved in 1959. Last previous edition approved in 2003 as D1653-03. DOI:
relative humidity at 73°F (23°C).
10.1520/D1653-03R08.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.3 In both methods, periodic weighings of the cup or dish
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
are made to determine the rate of water vapor movement
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. through the specimen.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D1653 − 03 (2008)
5. Significance and Use ing constant relative humidity by means of aqueous solutions,
refer to procedures outlined in Practice E104.
5.1 One of the factors affecting the performance provided
6.3 Analytical Balance, having an adequate capacity for the
by an organic coating is its capability of resisting or aiding the
weight of the test cups and a sensitivity of 1 mg.
passageofwatervapor.Insomeservices,forexample,exterior
woodandmasonry,thecoatinghastoallowmoderateamounts
7. Reagents and Materials
of water vapor to pass through the film without damage to it.
7.1 Purity of Water—Unless otherwise indicated, reference
Hence,thewatervaportransmissioncharacteristicsofcoatings
towatershallbeunderstoodtomeanreagentwaterconforming
are important in assessing their performance in practical use.
to Type IV of Specification D1193.
5.2 The purpose of these test methods is to obtain values of
7.2 Desiccant, consisting of either anhydrous calcium chlo-
water vapor transfer through coatings that range in permeabil-
ride (CaCL ) or anhydrous magnesium perchlorate (Mg-
ity from high to low. These values are for use in design,
(CLO ) ). The calcium chloride should be dried at 400°F
manufacture, and marketing. 4 2
(200°C) before use. If calcium chloride will react with the test
5.3 The water vapor transmission is not a linear function of
specimen, an adsorbing desiccant such as a silica gel may be
film thickness, temperature or relative humidity.
used but the moisture gain by this desiccant during the test
must be limited to 4%. Use caution in handling magnesium
5.4 Values of water vapor transmission rate (WVT) and
perchlorate because of possible chemical reaction that may be
water vapor permeance (WVP) can be used in the relative
ratingofcoatingsonlyifthecoatingsaretestedunderthesame produced if it comes in contact with some organic materials
and is subsequently heated to regenerate the anhydrous salt.
closely controlled conditions of temperature and relative hu-
midity, and if their thicknesses are equal.
7.3 Sealant, such as wax for attaching the test specimen to
the top of the perm cup or dish. It must be highly resistant to
5.5 Test Method A—The Dry Cup Method is the preferred
the passage of water vapor. It must not lose weight to, or gain
test method for obtaining values that relate to conventional
weight from, the atmosphere in an amount, over the required
dwellings where high relative humidities are not anticipated.
period of time, that would affect the test results by more than
5.6 Test Method B—The Wet Cup Method is the preferred
2%.Itmustnotaffectthevaporpressureinawater-filleddish.
test method for obtaining values that relate to applications
NOTE 1—Among acceptable sealants are (1) a 60:40 mixture of
wherehighrelativehumiditiesareanticipatedinthevicinityof
microcrystalline wax and refined crystalline parafin wax, (2) tissue
the barrier material. In general, the more permeable a coating
embedding wax, and (3) a 50:50 mixture of beeswax and rosin.
is to the passage of moisture as is typical of many water-
7.4 Release Paper, prepare free films, whenever possible to
reducible coatings, the greater its affinity for water and the
eliminate the potential interference of substrates, on release
greatertheincreaseintransmissionwhentestedinandexposed
paper or glass substrates following procedures outlined in
to high humidities. Absorption of water may make a coating
Practice D4708.
lessdense,thusallowingmoisturetodiffuseeasilyandcausea
much higher moisture vapor transmission rate, (WVTR) than
7.5 Film Support, for preparing films that are too brittle or
would occur in drier environments.
otherwise unsatisfactory for handling as free films. Support
materials such as paper charts, filter paper, and glass cloth
6. Apparatus have been found satisfactory in some instances. Such support
can have an effect on the test results.
6.1 Perm Cup or Dish, consisting of a container made of a
noncorrodingmaterial,impermeabletowaterorwatervapor.If
8. Test Specimens
the cup or dish is made of aluminum, it must be anodized or
8.1 It is very important that the test specimens be smooth,
given a protective clear coating to prevent corrosion.
andcompletelycontinuousfilmsofuniformthicknessthrough-
6.1.1 Onetypeofcupthatissuitablehasaflangededgeand
out the test area.Apply air drying coatings to substrates using
is equipped with a separate corresponding flange, so that the
one of the methods described in Practices D823 or D4708.
test specimen can be held between them. The contacting faces
NOTE2—Specialtestconditionsmayrequirethatthecoatingbeapplied
of the flanges shall be ground to such flatness that when the
by brushing, roller coating or other special methods. The thickness of the
filmisinposition,moisturetransfercanoccuronlythroughthe
coatingappliedshallbewithinnormalrangeforthetypeofmaterialunder
exposed film area. For hard films, or films having a very rough
test, and shall not vary by more than 5% of the total thickness in any test
surface, a soft rubber gasket may be inserted between the film
series.
and the flange. The flanges shall then be held together with
suitable clamps.
The sole source of supply of release Paper, Form RP-1K, known to the
6.1.2 Another suitable cup is any open circular or rectangu-
committee at this time is the Leneta Co., 15 Whitney Rd., Mahwah, NJ 07430 . If
you are aware of alternative suppliers, please provide this information to ASTM
lardishtowhichthetestfilmcanbesealedwithwaxorsealant.
International Headquarters. Your comments will receive careful consideration at a
6.2 Test Chamber,withacontrolledtemperatureandrelative
meeting of the responsible technical committee, which you may attend.
Thesolesourceofsupplyofpapercharts,FormNWK,knowntothecommittee
humidity as specified in Section 4. Air shall be circulated
atthistimeistheLenetaCo.,15WhitneyRd.,Mahwah,NJ07430.Ifyouareaware
throughout the chamber to maintain uniform conditions at all
of alternative suppliers, please provide this information to ASTM International
test locations. For low or high humidity conditions, a standard
Headquarters.Your comments will receive careful consideration at a meeting of the
desiccatororothersuitablecabinetmaybeused.Formainta
...
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.
e1
Designation:D1653–93 (Reapproved 1999)
Designation:D1653–03(Reapproved2008)
Standard Test Methods for
Water Vapor Transmission of Organic Coating Films
This standard is issued under the fixed designation D1653; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
e NOTE—Editorially changes made throughout in December 1999.
1. Scope
1.1 These test methods cover the determination of the rate at which water vapor passes through films of paint, varnish, lacquer,
and other organic coatings. The films may be free films or they may be applied to porous substrates.
1.2 Two test methods are covered as follows:
1.2.1 Test Method A—Dry Cup Method, and
1.2.2 Test Method B—Wet Cup Method.
1.2.3 Agreementshouldnotbeexpectedbetweenresultsobtainedbydifferentmethodsortestconditions.Themethodthatmost
closely approaches the conditions of use should be selected.
1.3The values stated in inch-pound units are to be designated as the standard. Factors for conversion are stated in
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard. Factors for conversion are stated
in 13.2.1.2 and 13.2.2.2.
1.4 This standard does not purport to address 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
2.1 ASTM Standards:
D823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
D1005 Test MethodsMethod for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D1193 Specification for Reagent Water
D4708 Practice for Preparation of Uniform Free Films of Organic Coatings
E104 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 water vapor transmission rate, WVT, n—the steady water vapor flow in unit time through unit area of a body, between
two specific parallel surfaces, under specific conditions of temperature and humidity at each surface.Accepted inch-pound unit is
grains per square foot per hour. Accepted SI unit is grams per square metre per 24 h.
3.1.2 water vapor permeance, WVPwatervaporpermeance,WVP, n—thesteadywatervaporflowinunittimethroughunitarea
ofabody(WVT)inducedbyunitvaporpressuredifference(Dp)betweenthetwosurfacesofacoating.Therefore,WVP=WVT/D
p.Accepted inch-pound unit is grains per square foot per hour per inch of mercury (called a perm).Accepted SI unit is grams per
square metre per 24 h per millimetre of mercury (called a metric perm).
4. Summary of Test Methods
4.1 In Test MethodA(Dry Cup Method), the test specimen is sealed to the open mouth of a cup or dish containing desiccant,
These test methods are under the jurisdiction ofASTM Committee D-1D01 on Paint and Related Coatings, Materials, andApplications and are the direct responsibility
of Subcommittee D01.23 on Physical Properties of Applied Paint Films.
Current edition approved Dec. 15, 1993.June 1, 2008. Published February 1994.June 2008. Originally published as D1653–59T.approved in 1959. Last previous edition
D1653–91a.approved in 2003 as D1653-03.
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM Standards
, Vol 06.01.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.
D1653–03 (2008)
and the assembly placed in a test chamber with a controlled atmosphere. Two sets of exposure conditions are acceptable for this
test method.
4.1.1 Condition A, consisting of 50% relative humidity at 73°F (23°C), and
4.1.2 Condition B, consisting of 90% relative humidity at 100°F (38°C).
4.2 In Test Method B (Wet Cup Method), the test specimen is sealed to the open mouth of a cup or dish containing water, and
the assembly placed in a test chamber with a controlled atmosphere. Two sets of exposure conditions are acceptable for this test
method:
4.2.1 Condition A, consisting of 50% relative humidity at 73°F (23°C), and
4.2.2 Condition C, consisting of very low (near zero) relative humidity at 73°F (23°C).
4.3 In both methods, periodic weighings of the cup or dish are made to determine the rate of water vapor movement through
the specimen.
5. Significance and Use
5.1 Oneofthefactorsaffectingtheperformanceprovidedbyanorganiccoatingisitscapabilityofresistingoraidingthepassage
of water vapor. In some services, for example, exterior wood and masonry, the coating has to allow moderate amounts of water
vapor to pass through the film without damage to it. Hence, the water vapor transmission characteristics of coatings are important
in assessing their performance in practical use.
5.2 The purpose of these test methods is to obtain values of water vapor transfer through coatings that range in permeability
from high to low. These values are for use in design, manufacture, and marketing.
5.3 The water vapor transmission is not a linear function of film thickness, temperature or relative humidity.
5.4 Values of water vapor transmission rate (WVT) and water vapor permeance (WVP) can be used in the relative rating of
coatings only if the coatings are tested under the same closely controlled conditions of temperature and relative humidity, and if
their thicknesses are equal.
5.5 Test Method A—TheDryCupMethodisthepreferredtestmethodforobtainingvaluesthatrelatetoconventionaldwellings
where high relative humidities are not anticipated.
5.6 Test Method B—TheWetCupMethodisthepreferredtestmethodforobtainingvaluesthatrelatetoapplicationswherehigh
relativehumiditiesareanticipatedinthevicinityofthebarriermaterial.Ingeneral,themorepermeableacoatingistothepassage
of moisture as is typical of many water-reducible coatings, the greater its affinity for water and the greater the increase in
transmission when tested in and exposed to high humidities. Absorption of water may make a coating less dense, thus allowing
moisture to diffuse easily and cause a much higher moisture vapor transmission rate, (WVTR) than would occur in drier
environments.
6. Apparatus
6.1 Perm Cup or Dish, consisting of a container made of a noncorroding material, impermeable to water or water vapor. If the
cup or dish is made of aluminum, it must be anodized or given a protective clear coating to prevent corrosion.
6.1.1 One type of cup that is suitable has a flanged edge and is equipped with a separate corresponding flange, so that the test
specimen can be held between them. The contacting faces of the flanges shall be ground to such flatness that when the film is in
position, moisture transfer can occur only through the exposed film area. For hard films, or films having a very rough surface, a
soft rubber gasket may be inserted between the film and the flange. The flanges shall then be held together with suitable clamps.
6.1.2 Another suitable cup is any open circular or rectangular dish to which the test film can be sealed with wax or sealant.
6.2 Test Chamber, with a controlled temperature and relative humidity as specified in Section 4. Air shall be circulated
throughout the chamber to maintain uniform conditions at all test locations. For low or high humidity conditions, a standard
desiccator or other suitable cabinet may be used. For maintaining constant relative humidity by means of aqueous solutions, refer
to procedures outlined in Practice E104.
6.3 Analytical Balance, having an adequate capacity for the weight of the test cups and a sensitivity of 1 mg.
7. Reagents and Materials
7.1 Purity of Water—Unless otherwise indicated, reference to water shall be understood to mean reagent water conforming to
Type IV of Specification D1193.
7.2 Desiccant, consisting of either anhydrous calcium chloride (CaCL ) or anhydrous magnesium perchlorate (Mg(CLO ) ).
2 4 2
The calcium chloride should be dried at 400°F (200°C) before use. If calcium chloride will react with the test specimen, an
adsorbingdesiccantsuchasasilicagelmaybeusedbutthemoisturegainbythisdesiccantduringthetestmustbelimitedto4%.
Usecautioninhandlingmagnesiumperchloratebecauseofpossiblechemicalreactionthatmaybeproducedifitcomesincontact
with some organic materials and is subsequently heated to regenerate the anhydrous salt.
7.3 Sealant, such as wax for attaching the test specimen to the top of the perm cup or dish. It must be highly resistant to the
passage of water vapor. It must not lose weight to, or gain weight from, the atmosphere in an amount, over the required period
of time, that would affect the test results by more than 2%. It must not affect the vapor pressure in a water-filled dish.
NOTE 1—Among acceptable sealants are (1) a 60:40 mixture of microcrystalline wax and refined crystalline parafin wax, ( 2) tissue embedding wax,
and (3) a 50:50 mixture of beeswax and rosin.
D1653–03 (2008)
7.4 Release Paper, prepare free films, whenever possible to eliminate the potential interference of substrates, on release paper
or glass substrates following procedures outlined in Practice D4708.
7.5 Film Support,forpreparingfilmsthataretoobrittleorotherwiseunsatisfactoryforhandlingasfreefilms.Supportmaterials
such as paper charts, filter paper, and glass cloth have been found satisfactory in some instances. Such support can have an effect
on the test results.
8. Test Specimens
8.1 Itisveryimportantthatthetestspecimensbesmooth,andcompletelycontinuousfilmsofuniformthicknessthroughoutthe
test area. Apply air drying coatings to substrates using one of the methods described in Practices D823 or D4708 or D4708.
NOTE 2—Special test conditions may require that the coating be applied by brushing, roller coating or other special methods. The thickness of the
coating applied shall be within normal range for the type of material under test, and shall not vary by more than 5% of the total thickness in any test
series.
NOTE 3—Whenapplyingbakingfinishes,bakeforspecifiedtimeandtemperatureinaccordancewithmanufacturers’instructions.Permeancemayvary
with the baking schedule or the time of air drying.
8.2 Air dry the coated material in a horizontal position for 7 days in a room preferably maintained at 73.5 6 3.5°F (23 6 2°C)
and 50 6 5% relative humidity. If the material is to be tested as a free film, remove it from the substrate and allow the previously
unexposed surface to dry for an additional 7 days. The drying schedule may be modified as recommended by manufacturer.
NOTE 4—Examine test films for the presence of pinholes or other defects before commencing the test. It may be advisable to apply the test material
in two coats, applying the second coat perpendicular to the first coat and allowing for an adequate drying period between coats to achieve the desired
film thickness.
8.3 Measure the thickness of the test specimen in several places with a micrometer using procedures in Test MethodsMethod
D1005 to ensure a uniform thickness.
8.4 When coatings are applied to support materials, the coated side of the test specimen should be placed away from the
desiccant or towards the water in the cup, depending upon the service environment. Coatings should not be applied to both sides
of a support. Glass cloth is preferred for coatings that are cured by baking.
TEST METHOD A—DRY CUP METHOD
9. Test Conditions
9.1 Unlessotherconditionsareagreeduponbetweenthepurchaserandtheseller,thetestsshallbeperformedunderoneormore
of the following conditions:
9.1.1 Condition A—Test chamber or cabinet maintained at 73° 6 1°F (23 6 0.6°C) and 50 6 2% relative humidity.
9.1.2 Condition B—Test chamber or desiccator maintained at 100 6 1°F (38 6 0.6°C) and 90 6 2% relative humidity.
10. Procedure
10.1 Prepare at least three perm cups or dishes for each test material as follows:
10.1.1 Fill the cups with desiccant to within ⁄4 in. (6 mm) of the top edge.
10.1.2 Ifthecupsareequippedwithflanges,placethetestspecimenbetweentheflangesandadjusttheclampstoholditfirmly
in position.
10.1.3 If the cups are not equipped with flanges, seal the test specimen to the top edge of the cups with wax as follows:
10.1.3.1 First carefully place the test specimen, cut to the size of the frame, on a thin cardboard ring soaked in molten wax.
10.1.3.2 Then place the specimen-covered frame over the mouth of the cup. Thoroughly seal the frame to the edge of the cup
at the temperature to be used in the test. If the coating is on a substrate or support, place the coated side away from the desiccant
in the cup.
NOTE 5—Imperfections in the film that are not readily visible may produce inconsistent results; consequently make sure that the test is always run at
least in triplicate.
10.2 Weightheloadedcupsto1mgandifatestchamberisnotbeingused,placetheminthetestcabinetsordesiccators.Record
time, temperature, and relative humidity.
10.3 Remove if necessary, the cups for periodic weighing to determine weight gain. Coatings expected to have high WVT
ratings, over 10 perms, may require weighings more frequently than once a day.
Annual Book of ASTM Standards, Vol 11.01.
The sole source of supply of release Paper, Form RP-1K, known to the committee at this time is the Leneta Co., 15Whitney Rd., Mahwah, NJ 07430 . If you are aware
ofalternativesuppliers,pleaseprovidethisinformationtoASTMInternationalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsible
technical committee, which you may attend.
Annual Book of ASTM Standards, Vol 11.03.
The sole source of supply of paper charts, Form NWK, known to the committee at this time is the Leneta Co., 15 Whitney Rd., Mahwah, NJ 07430 . If you are aware
ofalternativesuppliers,pleaseprovidethisinformationtoASTMInternationalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsible
technical committee, which you may attend.
...
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