Standard Test Method for Volume Shrinkage of Latex Sealants During Cure

SIGNIFICANCE AND USE
Shrinkage of a sealant, after application in a building joint, is caused by loss of volatile components from the sealant. This loss results in a decrease in volume and, hence, a change in the sealant’shape. This change in shape, in some applications, should be taken into consideration for acceptable joint appearance and geometry.
The shrinkage value obtained by this test method helps predict the appearance and geometry of the cured sealant in a building joint and is helpful in determining the amount and type of tooling to be done during installation of the sealant.
Latex sealants cure primarily through water evaporation. They may also contain small amounts of other volatile components. However, in this test method all volatiles are treated as water. This assumption still provides a meaningful shrinkage value since the small quantities of other volatiles and their differences in density from that of water do not significantly affect the usefulness of the result obtained.
SCOPE
1.1 This test method covers a laboratory procedure for determining volume shrinkage, which occurs during cure, of a latex sealant.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information only.
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.Note 1
A related ISO standard is ISO 10563. The user should compare to determine how it differs from this test method.

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Publication Date
31-Aug-2005
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ASTM C1241-00(2005) - Standard Test Method for Volume Shrinkage of Latex Sealants During Cure
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C1241–00(Reapproved2005)
Standard Test Method for
Volume Shrinkage of Latex Sealants During Cure
This standard is issued under the fixed designation C 1241; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope duringthe28-daycure,andthedensityofwater.Thedensityof
the sealant is determined by the weight-per-gallon cup proce-
1.1 This test method covers a laboratory procedure for
dure described in Test Method D 1475.
determining volume shrinkage, which occurs during cure, of a
latex sealant.
5. Significance and Use
1.2 The values stated in SI units are to be regarded as the
5.1 Shrinkage of a sealant, after application in a building
standard. The values given in parentheses are provided for
joint,iscausedbylossofvolatilecomponentsfromthesealant.
information only.
This loss results in a decrease in volume and, hence, a change
1.3 This standard does not purport to address all of the
in the sealant’s shape. This change in shape, in some applica-
safety concerns, if any, associated with its use. It is the
tions, should be taken into consideration for acceptable joint
responsibility of the user of this standard to establish appro-
appearance and geometry.
priate safety and health practices and determine the applica-
5.2 The shrinkage value obtained by this test method helps
bility of regulatory limitations prior to use.
predict the appearance and geometry of the cured sealant in a
NOTE 1—A related ISO standard is ISO 10563. The user should
building joint and is helpful in determining the amount and
compare to determine how it differs from this test method.
type of tooling to be done during installation of the sealant.
5.3 Latex sealants cure primarily through water evapora-
2. Referenced Documents
tion. They may also contain small amounts of other volatile
2.1 ASTM Standards:
components. However, in this test method all volatiles are
C 717 Terminology of Building Seals and Sealants
treated as water. This assumption still provides a meaningful
D 1475 Test Method for Density of Paint,Varnish, Lacquer,
shrinkagevaluesincethesmallquantitiesofothervolatilesand
and Related Products
their differences in density from that of water do not signifi-
2.2 ISO Standards:
cantly affect the usefulness of the result obtained.
ISO 10563 Building Construction–Sealants–Determination
of Change in Mass and Volume
6. Apparatus
6.1 Polyethylene Film—Three sheets, each about 51 by 51
3. Terminology
mm (2 by 2 in.) by 0.127 mm (5 mil) thick.
3.1 Definitions—RefertoTerminologyC 717fordefinitions
6.2 Weight-per-Gallon Cup, 80 to 90 mL capacity.
of the following terms used in this test method: cure, joint,
6.3 Constant Temperature Bath or Room, held at 23 6
latex sealant, sealant, shrinkage (volume), and tooling.
2.0°C (73 6 3.6°F).
6.4 Forceps.
4. Summary of Test Method
6.5 Distilled Water.
4.1 The sealant is extruded onto polyethylene release film
and weighed.After curing for 28 days, its volume shrinkage is
7. Procedure
calculated using the sealant’s density, the percent weight lost
7.1 Standard conditions of temperature and relative humid-
ity for the test shall be 23 6 2°C (73 6 3.6°F) and 50 65%,
respectively.
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
Seals and Sealants and is the direct responsibility of Subcommittee C24.20 on
7.2 Condition the sealant to be tested in a closed container
General Sealant Standards.
at standard conditions for at least 24 h.
Current edition approved Sept. 1, 2005. Published October 2005. Originally
7.3 Condition approximately 2 L of distilled water at
approved in 1993. Last previous edition approved in 2000 as C 1241 – 00.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or standard conditions for at least 24 h.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.4 Determine the density (D ) in grams per millilitre of
s
Standards volume information, refer to the standard’s Document Summary page on
fresh sealant by Test Method D 1475. Record the average
the ASTM website.
density (D ) of three determinations.
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
s
4th Floor, New York, NY 10036.
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