ASTM D8336-24
(Test Method)Standard Test Method for Characterizing Tack of Prepregs Using a Continuous Application-and-Peel Procedure
Standard Test Method for Characterizing Tack of Prepregs Using a Continuous Application-and-Peel Procedure
SIGNIFICANCE AND USE
5.1 Characterizing tack for different prepreg materials, test parameters, surface combinations, and environmental conditions provides insight for optimizing process parameters (particularly deposition rate and deposition temperature) for industrial automated material placement processes.
5.2 Results obtained through employing the continuous application-and-peel method, as described in studies (1-3),3 reflect the effects of adhesion forming between prepreg layers or between prepreg and metal substrate, and loss of cohesion within the resin in the prepreg, upon tack. This test method allows the adhesive properties of B-staged resin to be explored in a manner relevant for dynamic material deposition processes, where timescales for bonding of prepreg to the substrate or previously placed prepreg layers are short prior to curing. In contrast, Test Methods D3167 and D1781 determine the peel resistance of adhesive bonds for adhesion measurement and process control of laminated or bonded adherends.
5.3 The test method is suitable to quantify tack of prepregs for acceptance and process control and can be extended to determine resin shelf life or to adjust process parameters to resin out-time. Direct comparison of different resins/prepregs or processes can only be made when specimen preparation and test conditions are identical.
SCOPE
1.1 This test method covers measurement of adhesion (tack) between partially cured (B-staged) composite prepreg and a surface in a peel test, under specified conditions. The test may be conducted to measure tack between a flexible layer of prepreg and another prepreg layer bonded to a rigid substrate (Method I) or a rigid metal substrate (Method II). This test method is primarily geared towards material characterization for automated material layup but can be modified for use with other processes. It is well known that material tack is a function of multiple processing and environmental variables. Permissible composite prepreg materials include carbon, glass, and aramid fibers within a B-staged thermoset resin.
1.2 Measured tack is specified in terms of a peel force at a given specimen width.
1.3 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 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: D8336 − 24
Standard Test Method for
Characterizing Tack of Prepregs Using a Continuous
1
Application-and-Peel Procedure
This standard is issued under the fixed designation D8336; 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.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers measurement of adhesion (tack)
A480/A480M Specification for General Requirements for
between partially cured (B-staged) composite prepreg and a
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
surface in a peel test, under specified conditions. The test may
Sheet, and Strip
be conducted to measure tack between a flexible layer of
D883 Terminology Relating to Plastics
prepreg and another prepreg layer bonded to a rigid substrate
D1781 Test Method for Climbing Drum Peel for Adhesives
(Method I) or a rigid metal substrate (Method II). This test
D3167 Test Method for Floating Roller Peel Resistance of
method is primarily geared towards material characterization
Adhesives
for automated material layup but can be modified for use with
D3330 Test Method for Peel Adhesion of Pressure-Sensitive
other processes. It is well known that material tack is a function
Tape
of multiple processing and environmental variables. Permis-
D3878 Terminology for Composite Materials
sible composite prepreg materials include carbon, glass, and
D6862 Test Method for 90 Degree Peel Resistance of
aramid fibers within a B-staged thermoset resin.
Adhesives
1.2 Measured tack is specified in terms of a peel force at a
E4 Practices for Force Calibration and Verification of Test-
given specimen width.
ing Machines
E122 Practice for Calculating Sample Size to Estimate, With
1.3 Units—The values stated in SI units are to be regarded
Specified Precision, the Average for a Characteristic of a
as standard. The values given in parentheses after SI units are
Lot or Process
provided for information only and are not considered standard.
E177 Practice for Use of the Terms Precision and Bias in
The values stated in each system are not necessarily exact
ASTM Test Methods
equivalents; therefore, to ensure conformance with the
E456 Terminology Relating to Quality and Statistics
standard, each system shall be used independently of the other,
E691 Practice for Conducting an Interlaboratory Study to
and values from the two systems shall not be combined.
Determine the Precision of a Test Method
1.4 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.1 Definitions—Terminology D3878 defines terms relating
priate safety, health, and environmental practices and deter-
to composite materials. Terminology D883 defines terms
mine the applicability of regulatory limitations prior to use.
relating to plastics. Terminology E456 and Practice E177
define terms relating to statistics. In the event of a conflict
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard- between terms, Terminology D3878 shall have precedence
over the other documents.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4. Summary of Test Method
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
4.1 A continuous application-and-peel method is employed
to quantify tack at given test conditions (such as temperature)
between one B-staged prepreg layer and the surface of a second
1
This test method is under the jurisdiction of ASTM Committee D30 on
Composite Materials and is the direct responsibility of Subcommittee D30.03 on
2
Constituent/Precursor Properties. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Feb. 15, 2024. Published March 2024. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2021. Last previous edition approved in 2021 as D8336 – 21. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D8336-24. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D8336 − 24
B-staged prepreg layer which is bonded to a rigid substrate in a manner relev
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D8336 − 21 D8336 − 24
Standard Test Method for
Characterizing Tack of Prepregs Using a Continuous
1
Application-and-Peel Procedure
This standard is issued under the fixed designation D8336; 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.
1. Scope
1.1 This test method covers measurement of adhesion (tack) between partially cured (B-staged) composite prepreg and a
substratesurface in a peel test, under specified conditions. The test may be conducted to measure tack between a flexible layer of
prepreg and another prepreg layer bonded to a rigid substrate (Method I) or a rigid metal substrate (Method II). This test method
is primarily geared towards material characterization for automated material layup but can be modified for use with other
processes. It is well known that material tack is a function of multiple processing and environmental variables. Permissible
composite prepreg materials include carbon, glass, and aramid fibers within a B-staged thermoset resin.
1.2 Measured tack is specified in terms of a peel force at a given specimen width.
1.3 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided
for information only and are not considered standard. The values stated in each system are not necessarily exact equivalents;
therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two
systems shall not be combined.
1.4 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
D883 Terminology Relating to Plastics
D1781 Test Method for Climbing Drum Peel for Adhesives
D3167 Test Method for Floating Roller Peel Resistance of Adhesives
D3330 Test Method for Peel Adhesion of Pressure-Sensitive Tape
D3878 Terminology for Composite Materials
1
This test method is under the jurisdiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.03 on
Constituent/Precursor Properties.
Current edition approved Feb. 1, 2021Feb. 15, 2024. Published March 2021March 2024. Originally approved in 2021. Last previous edition approved in 2021 as
D8336 – 21. DOI: 10.1520/D8336-21.10.1520/D8336-24.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D8336 − 24
D6862 Test Method for 90 Degree Peel Resistance of Adhesives
E4 Practices for Force Calibration and Verification of Testing Machines
E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or
Process
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E456 Terminology Relating to Quality and Statistics
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions—Terminology D3878 defines terms relating to composite materials. Terminology D883 defines terms relating to
plastics. Terminology E456 and Practice E177 define terms relating to statistics. In the event of a conflict between terms,
Terminology D3878 shall have precedence over the other documents.
4. Summary of Test Method
4.1 A continuous application-and-peel method is employed to quantify tack at given test condit
...
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