ASTM D2739-97(2017)
(Test Method)Standard Test Method for Volume Resistivity of Conductive Adhesives
Standard Test Method for Volume Resistivity of Conductive Adhesives
SIGNIFICANCE AND USE
5.1 Accurate measurement of the volume resistivity of conductive adhesives is important, particularly with respect to applications in electronic packaging techniques. This method measures the resistance of conductive adhesives used in thin films as part of a bonded assembly. This does not imply that the measured results are applicable to different configurations with different metals. This method may be used for acceptance testing and for screening materials.
SCOPE
1.1 This test method covers the determination of the volume resistivity of resin-based conductive adhesives in the cured condition. The test is made on a thin adhesive layer as prepared in a bonded specimen. This test method is used for conductive adhesives that are cured either at room temperature or at elevated temperatures.
1.2 The values stated in either SI or other units shall be regarded separately as standard. SI equivalents to screw threads are shown in the figures.
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D2739 − 97 (Reapproved 2017)
Standard Test Method for
Volume Resistivity of Conductive Adhesives
This standard is issued under the fixed designation D2739; 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.
1. Scope 3. Terminology
1.1 Thistestmethodcoversthedeterminationofthevolume 3.1 Definitions:
resistivity of resin-based conductive adhesives in the cured 3.1.1 Many terms in this test method are defined in Termi-
condition.Thetestismadeonathinadhesivelayerasprepared nology D907.
in a bonded specimen. This test method is used for conductive 3.1.2 conductivity, n—theratioofthecurrentdensitycarried
adhesives that are cured either at room temperature or at through a specimen to the potential gradient paralleling the
elevated temperatures. current. This is numerically equal to the conductance between
opposite faces of a unit cube of liquid. It is the reciprocal of
1.2 The values stated in either SI or other units shall be
resistivity. D2864, D27
regarded separately as standard. SI equivalents to screw
3.1.3 resistivity, volume, n—theratiooftheelectricpotential
threads are shown in the figures.
gradient to the current density when the gradient is parallel to
1.3 This standard does not purport to address the safety
the current in the material. D1566, D11
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety,
4. Summary of Test Method
health, and environmental practices and determine the appli-
4.1 Thevolumeresistivityofadhesivelayerscuredbetween
cability of regulatory limitations prior to use.
metal adherends is measured on a resistance bridge. Tensile
1.4 This international standard was developed in accor-
adhesion plugs (Fig. 1) are described in this test method.Any
dance with internationally recognized principles on standard-
other test specimens and materials can be used as long as
ization established in the Decision on Principles for the
similar precautions (see Section 7) are observed regarding
Development of International Standards, Guides and Recom-
preparation and tolerances.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5. Significance and Use
2. Referenced Documents
5.1 Accurate measurement of the volume resistivity of
2 conductive adhesives is important, particularly with respect to
2.1 ASTM Standards:
applications in electronic packaging techniques. This method
D618Practice for Conditioning Plastics for Testing
measures the resistance of conductive adhesives used in thin
D907Terminology of Adhesives
filmsaspartofabondedassembly.Thisdoesnotimplythatthe
2.2 Federal Specification:
measuredresultsareapplicabletodifferentconfigurationswith
QQ-B-626 Composition 22
different metals. This method may be used for acceptance
2.3 ASTM Adjuncts:
testing and for screening materials.
Assembly Jig
6. Apparatus
1 6.1 Kelvin (Resistance) Bridge,calibratedto1%accuracy.
This test method is under the jurisdiction of ASTM Committee D14 on
Adhesives and is the direct responsibility of Subcommittee D14.80 on Metal
6.2 With the agreement of the interested parties, any metal
Bonding Adhesives.
tensile adhesion plugs (Fig. 1) can be used to prepare the
Current edition approved Nov. 1, 2017. Published November 2017. Originally
approved in 1968. Last previous edition approved in 2010 as D2739–97(2010). tensile adhesion specimens.
DOI: 10.1520/D2739-97R17.
2 NOTE 1—Different metals will inherently provide different resistance
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Plugs to accommodate banana plug—No. 192, Herman H. Smith, Inc., or
Available from DLA Document Services, Building 4/D, 700 Robbins Ave., equivalent.
Philadelphia, PA 19111-5094, http://quicksearch.dla.mil. Satisfactory resistance bridges are made by: Leads and Northup Co. Bridge
Detailed drawings of the assembly jig are available from ASTM International Catalog No. 4306, Minneapolis Honeywell Division Catalog No. 1622, and Biddle
Headquarters. Order Adjunct No. ADJD2739. Original adjunct produced in 1987. Instruments Catalog No. 603282.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D2739 − 97 (2017)
FIG. 1 Brass Tensile Adhesion Specimens with Electrical Connections
values. The measured resistance is dependent on resistance at the
8. Preparation of Apparatus
adhesive-adherend interface due to metal oxide formation. The extent of
oxide formation varies with locality and laboratory conditions. Brass, 8.1 Before application of the adhesive, set the adhesive
conforming to Federal Specification QQ-B-626 Composition 22, is a
thickness by tightening plugs in place, using a feeler gauge to
convenient metal. However, in order to minimize oxide formation,
determine the clearance between plugs.
especiallywheremeasurementsarecritical,asinrefereemeasurements,it
is recommended that the metal plugs be plated with either gold or silver
8.2 Botto
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