ASTM C908-00

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:C908–00
Standard Test Method for
Yield Strength of Preformed Tape Sealants
This standard is issued under the fixed designation C 908; 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 5. Apparatus
1.1 This test method covers a laboratory procedure for 5.1 Glass Plates, two, each 6.35 by 76.2 by 76.2 mm ( ⁄4 by
determining the yield strength of preformed tape sealants. 3 by 3 in.).
1.2 The values stated in acceptable metric units are to be
NOTE 2—Othersubstratessuchasaluminum,acrylic,ABS,etc.,maybe
regarded as the standard. The values given in parentheses are
substituted for the plates (5.1) and panels (5.2).
for information only.
5.2 Steel Panels, two, cold-rolled, each 0.762 by 76.2 by
1.3 This standard does not purport to address all of the
76.2 mm (0.03 by 3 by 3 in.) (Note 2).
safety concerns, if any, associated with its use. It is the
5.3 Laboratory Press, or equivalent.
responsibility of the user of this standard to establish appro-
5.4 Tension Testing Machine, or equivalent, with a jaw
priate safety and health practices and determine the applica-
separation rate of 25 mm (1 in.)/min.
bility of regulatory limitations prior to use.
5.5 Recorder, for recording the tension load in pascals (or
NOTE 1—There are no ISO standards similar or equivalent to this
pounds-force).
ASTM standard.
5.6 Rule.
5.7 Spacers, 5.1 by 5.1 by 76.2 mm (0.20 by 0.20 by 3 in.).
2. Referenced Documents
2.1 ASTM Standards:
6. Sampling
C 717 Terminology of Building Seals and Sealants
6.1 Take samples to be tested taken from a fresh roll of tape
E 177 Practice for Use of the Terms Precision and Bias in
sealant after first removing and discarding approximately the
ASTM Test Methods
first 0.61 m (2 ft) of the roll.
E 691 Practice for Conducting an Interlaboratory Study to
6.2 Sealant tape configuration should be 9.53 by 9.53 mm
Determine the Precision of a Test Method
3 3
( ⁄8 by ⁄8 in.). If the sample does not approximate these
dimensions, the sample should be re-extruded rather than plied
3. Terminology
up to conform to the specified size.
3.1 Refer to Terminology C 717 for definitions of the
following terms used in this test method: adhesive failure;
7. Test Specimens
cohesive failure; elongation; modulus; primer; substrate; and
7.1 Prepare two test specimens per sample as follows:
tape sealant.
7.1.1 Clean the glass plates with a suitable solvent, such as
methyl ethyl ketone.
4. Significance and Use
7.1.2 Clean the steel plates with a suitable solvent, such as
4.1 Tape sealants are tacky, deformable solids that are used
methyl ethyl ketone.
under compression between two or more surfaces of similar or
NOTE 3—If the steel panels have been painted or prepared with other
dissimilar materials in a variety of sealing applications. This
specified surface treatments, omit this cleaning procedure.
procedure is not intended to simulate an actual use condition
NOTE 4—Primers may be used.
but will give some indication of the cohesive and adhesive
3 3
7.1.3 Place two 76.2 by 9.53 by 9.53-mm (3 by ⁄8 by ⁄8-in.)
bonding properties of the tape. It also provides an indication of
lengths of tape on one of the steel plates, located as shown in
the modulus and tensile strength of the sealant tape composi-
Fig. 1, and remove the release paper. Place a spacer outboard
tion.
of each tape. Place a glass plate over the tape to complete the
test specimen assembly in accordance with Fig. 1.
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
Seals and Sealants and is the direct responsibility of Subcommittee C24.30 on
Adhesion.
Current edition approved Jan. 10, 2000. Published April 2000. Originally
published as C 908 – 79. Last previous edition C 908 – 95.
Annual Book of ASTM Standards, Vol 04.07.
Annual Book of ASTM Standards, Vol 14.02.
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