ASTM D2094-00
(Practice)Standard Practice for Preparation of Bar and Rod Specimens for Adhesion Tests
Standard Practice for Preparation of Bar and Rod Specimens for Adhesion Tests
SCOPE
1.1 This practice describes bar- and rod-type butt-joined adhesion test specimens and procedures for preparing and bonding them. The specimens are intended to be used with various adherend materials in like or unlike combinations for determining the strength properties of adhesives in accordance with Test Method D2095.
1.2 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.
1.3 The values stated in SI units are considered to be the standard. The values in parentheses are for information only.
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Designation: D 2094 – 00
Standard Practice for
Preparation of Bar and Rod Specimens for Adhesion Tests
This standard is issued under the fixed designation D 2094; 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. Test Specimens
1.1 This practice describes bar- and rod-type butt-joined 5.1 Geometry—Test specimens conform to the forms and
adhesion test specimens and procedures for preparing and dimensions shown in Fig. 1, Fig. 2, or Fig. 3. Only the bar
bonding them. The specimens are intended to be used with specimen (Fig. 1) shall be used for cleavage strength tests.
various adherend materials in like or unlike combinations for Only the rod specimen (Fig. 2) or the modified bar specimen
determining the strength properties of adhesives in accordance (Fig. 3) shall be used for tests in torsional shear.Amodification
with Test Method D 2095. of the specimen is permissible in tensile tests with dissimilar
1.2 This standard does not purport to address all of the adherends, particularly if one of the adherend materials is
safety concerns, if any, associated with its use. It is the difficult to machine (for example, glass) or if the strength of the
responsibility of the user of this standard to establish appro- adherend is such that failure under stress occurs at the drilled
priate safety and health practices and determine the applica- hole. This modification consists of a sheet of the material
3 1 1
bility of regulatory limitations prior to use. approximately 19 mm ( ⁄4 in.) square and 1 ⁄2to6mm( ⁄16 to
1.3 The values stated in SI units are considered to be the ⁄4 in.) thick inserted and bonded between the ends of the bar or
standard. The values in parentheses are for information only. rod specimens. For comparison purposes, specimen geometry
shall be the same unless the effect of insert dimensions is under
2. Referenced Documents
study.
2.1 ASTM Standards:
5.2 Machining of Adherends:
D 907 Terminology of Adhesives 5.2.1 Use metal adherends machined from bar or rod stock
D 2093 PracticeforPreparationofSurfacesofPlasticsPrior
with the surface to be bonded finished to 1 µm.
to Adhesive Bonding 5.2.2 Machine plastic from laminated flat panels using a
D 2095 Test Method for Tensile Strength of Adhesives by
diamond charged wheel for rough machining and a carbide-
Means of Bar and Rod Specimens
tipped tool for finish machining. Do all machining dry using
D 2651 Guide for Preparation of Metal Surfaces for Adhe- care not to damage surfaces by overheating or contamination
sive Bonding
with lubricants. Machine laminar materials so that the axis of
the specimen will lie in the plane of the lamina, and so that the
3. Terminology
plane of the lamina coincides with one side of the specimen
3.1 Definitions—Many terms in this practice are defined in
with the hole perpendicular to the plane of the lamina. Finish
Terminology D 907.
plastic to 80 µm or better unless studying surface finish.
5.2.3 Nonreinforced plastics (either thermoplastic or ther-
4. Significance and Use
mosetting) molded in a 127 by 12.7 by 12.7-mm (5 by 0.5 by
4.1 The procedures outlined in this practice are designed to
0.5-in.) bar mold, machined to a 38.1 mm (1.5 in.) length and
standardize the test specimens, surface preparations, combina-
a hole drilled as shown in Fig. 1. Specimens machined from
tions of materials, and adhesive selection. Because of the
extruded, cast, or molded plastic rod or sheet are also accept-
flexibility in the procedure, it is important to have some idea of
able.
the kind of properties that will be observed during testing.
5.3 Surface Preparation of Adherends:
5.3.1 Prepare specimen surfaces in accordance with recom-
mendations of the adhesive manufacturer, unless it is desired to
This practice is under the jurisdiction of ASTM Committee D14 on Adhesives
evaluate other methods of preparation, or, unless in the case of
and is the direct responsibility of Subcommittee D14.80 on Metal Bonding
specific surfaces, other methods are considered superior (see
Adhesives.
Current edition approved Oct. 10, 2000. Published December 2000. Originally
Guide D 2651).
published as D 2094 – 62 T. Last previous edition D 2094 – 91.
Annual Book of ASTM Standards, Vol 15.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D2094–00
Machining Requirements:
1. Two adjacent sides shall be ground so that included angle is 90° 6 7 min.
2. Ends shall be ground
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