ASTM C661-06(2011)
(Test Method)Standard Test Method for Indentation Hardness of Elastomeric-Type Sealants by Means of a Durometer
Standard Test Method for Indentation Hardness of Elastomeric-Type Sealants by Means of a Durometer
SIGNIFICANCE AND USE
The results obtained by this test method are simply a measure of the indentation into the sealant material of the indentor under load; they are not generally considered a measure of abrasion or wear resistance of the sealant.
SCOPE
1.1 This test method describes a laboratory procedure for determining indentation hardness of joint sealing compounds, (single- and multicomponent), intended for use in building construction.
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.
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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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C661 − 06(Reapproved 2011)
Standard Test Method for
Indentation Hardness of Elastomeric-Type Sealants by
Means of a Durometer
This standard is issued under the fixed designation C661; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope indentor under load; they are not generally considered a
measure of abrasion or wear resistance of the sealant.
1.1 This test method describes a laboratory procedure for
determining indentation hardness of joint sealing compounds,
5. Apparatus
(single- and multicomponent), intended for use in building
5.1 Durometer, Type A-2, with a dial graduated in units from
construction.
0 to 100. (See Test Method D2240 for a description of the
1.2 The values stated in SI units are to be regarded as the
indentor and a method of calibration of the durometer.)
standard. The values in parentheses are for information only.
5.2 Rectangular Brass Frame, with inside dimensions 130
1.3 Thecommitteewithjurisdictionoverthisstandardisnot
1 1
by 40 by 6 mm (approximately 5 by 1 ⁄2 by ⁄4 in.).
aware of any comparable standards published by other orga-
5.3 Aluminum Plates, two 16 to 24 gage, 80 by 150 mm
nizations.
(approximately 3 by 6 in.).
1.4 This standard does not purport to address the safety
5.4 Thin-Bladed Knife.
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
5.5 Chamber, capable of maintaining 38 6 2°C (100 6
health practices and determine the applicability of regulatory
3.5°F) and 95 % relative humidity.
limitations prior to use.
5.6 Metal Straightedge.
2. Referenced Documents
6. Standard Test Conditions
2.1 ASTM Standards:
6.1 Unless otherwise specified by those authorizing the
C717 Terminology of Building Seals and Sealants
tests, standard conditions for test are room temperature: 23 6
D2240 Test Method for Rubber Property—Durometer Hard-
2°C (73.4 6 3.6°F) and 50 6 5 % relative humidity.
ness
7. Procedure
3. Terminology
7.1 Test for Hardness of Multicomponent Sealants:
3.1 Definitions—See Terminology C717 for applicable defi-
7.1.1 Condition at least 250 g of base compound and
nitions of the following terms: compound; elastomeric; hard-
appropriate amounts of curing agent for at least 24 h at
ness; joint; sealant, non-sag; sealant, self-levling.
standard conditions; then mix the components thoroughly for 5
min.
4. Significance and Use
7.1.2 Fill the brass frame, after centering it on the aluminum
4.1 The results obtained by this test method are simply a
plate, with a portion of the conditioned compound and strike it
measure of the indentation into the sealant material of the
off flat with a metal straightedge. Lift the frame from the
sealant after separating it by running a thin-bladed knife along
the inside of the frame. Prepare two such specimens and cure
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
them for 14 days at standard conditions.
Seals and Sealants and is the direct responsibility of Subcommittee C24.20 on
General Test Methods.
NOTE 1—In the case of a self-leveling sealant or compound, do not lift
Current edition approved Jan. 1, 2011. Published March 2011. Originally
the brass frame until the sealant is sufficiently cured so that it will not
approved in 1970. Last previous edition approved in 2006 as C661 – 06. DOI:
spread on the plate.
10.1520/C0661-06R11.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.1.3 At the end of the curing period, take three hardness
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
readings on each specimen at standard conditions. Hold the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. durometer on the surface of the specimen and press it firmly
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C661 − 06 (2011)
against the surface using a force of about 1.3 kgf (3 lbf). Keep 7.2.1 Condition at least 250 g of compound for a minimum
the pressure foot parallel to the surface of the specimen. Take of 24 h at standard conditions before starting the test.
the instantaneous indentation reading immediately after mak- 7.2.2 Center the brass frame on the aluminum plate and fill
ing firm contact between the pressure foot and the specimen. the opening with a portion of the conditioned compound,
After taking the first reading, shift the durometer (or specimen) striking the compound off flat with a straightedge. Lift the
to a new position in order to avoid errors due to fatigue and frame from the sealant after separating it by running a
surface effects from the previous indentation. Take readings on thin-bladed knife along the inside edge of the frame. Two such
smooth portions of the surface no closer than 13 mm ( ⁄2 in.) specimens shall be prepared.
fromtheedgesofthesealantpatandalsonocloserthan25mm 7.2.3 Cure the test specimens for a total of 21 days as
(1 in.) from each other. Note the individual values, each follows: 7 days at standard conditions; 7 days in a chamber
rounded off to the nearest unit on the scale. controlled at 38 6 2°C (100 6 3.5°F) and 95 % relative
humidity; and 7 days at standard conditions.
NOTE 2—The highest precision in this test can be obtained when the
durometer is supported by a rigid stand and a dead weight is fastened
NOTE 4—The manufacturer may request combinations of temperature
directly to the i
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