ASTM D3795-20

Standard Test Method for Thermal Flow, Cure, and Behavior Properties of Pourable Thermosetting Materials by Torque Rheometer

SIGNIFICANCE AND USE
5.1 The continuous recording of torque and temperature while going through these various stages can be used to predict the behavior of the material during processing.  
5.2 The torque rheometer test has two important functions. First, it is a means to predict flow/viscosity and cure characteristics of pourable thermosetting compounds. For example, the test provides useful data to predict the processibility of a material in a particular molding method. This information is also useful to optimize process conditions for a particular material such as the minimum pressure to fill a mold and the time to cure a part. A second capability of the test is to provide a graphic record of the batch-to-batch uniformity of the molding compound.
SCOPE
1.1 This test method covers the apparatus, and a specific test method, including the evaluation of results required for the determination of the thermal flow and cure behavior properties of pourable thermosetting materials.  
1.2 This test method can be used:  
1.2.1 As a control for the development and production of pourable thermosetting materials and to measure the different properties (for example, melting behavior, cure behavior, etc.) as well as the influence of various additives and fillers in any given formulations, and  
1.2.2 Verify the uniformity of different production batches of the same formulation.  
1.3 The values are stated in SI units.  
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. Specific precautions are given in Section 7.
Note 1: This standard is equivalent to the inactive ISO 15062. This standard and ISO 15252-2 address the same subject matter, but differ in technical content.  
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

• Status: Published
• Publication Date: 31-Mar-2020
• ICS: 83.080.01 - Plastics in general
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.30 - Thermal Properties

Relations

• Referred By: ASTM D704-99(2020) - Standard Specification for Melamine-Formaldehyde Molding Compounds
• Effective Date: 01-Apr-2020

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: D3795 − 20
Standard Test Method for
Thermal Flow, Cure, and Behavior Properties of Pourable
1
Thermosetting Materials by Torque Rheometer
This standard is issued under the fixed designation D3795; 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* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 Thistestmethodcoverstheapparatus,andaspecifictest
D792Test Methods for Density and Specific Gravity (Rela-
method, including the evaluation of results required for the
tive Density) of Plastics by Displacement
determination of the thermal flow and cure behavior properties
D883Terminology Relating to Plastics
of pourable thermosetting materials.
3
D1898Practice for Sampling of Plastics (Withdrawn 1998)
1.2 This test method can be used:
E691Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.2.1 As a control for the development and production of
4
pourable thermosetting materials and to measure the different 2.2 ISO Standards:
ISO15062Plastics—Determination of the thermal-flow and
properties (for example, melting behavior, cure behavior, etc.)
cure behaviour of thermosetting materials by torque rhe-
as well as the influence of various additives and fillers in any
ometry
given formulations, and
ISO 15252-2 Plastics—Epoxy Powder Moulding Com-
1.2.2 Verify the uniformity of different production batches
pounds (EP-PMCs)—Part 2: Preparation of Test Speci-
of the same formulation.
mens And Determination of Properties
1.3 The values are stated in SI units.
3. Terminology
1.4 This standard does not purport to address all of the
3.1 Definitions—For definitions of terms used in this test
safety concerns, if any, associated with its use. It is the
method and associated with plastics issues refer to the termi-
responsibility of the user of this standard to establish appro-
nology contained in Terminology D883.
priate safety, health, and environmental practices and deter-
3.2 Definitions of Terms Specific to This Standard:
mine the applicability of regulatory limitations prior to use.
3.2.1 For the purpose of this test method, the following
Specific precautions are given in Section 7.
definitions apply, (see Fig. 1):
NOTE 1—This standard is equivalent to the inactive ISO15062. This
3.2.2 flow and cure behavior—the flow behavior is repre-
standard and ISO15252-2 address the same subject matter, but differ in
sented by the recorded torque curve from the loading peak
technical content.
(Point t ), to the torque minimum (Point t ).The cure behavior
1 5
1.5 This international standard was developed in accor-
is represented by the recorded torque curve from the torque
dance with internationally recognized principles on standard-
minimum(Point t )tothetorquemaximum(Point t ).Therate
5 4
ization established in the Decision on Principles for the
of curing is represented by the slope of the torque curve.
Development of International Standards, Guides and Recom-
3.2.3 time—theresidencetimeattorque t ×X,where Xisa
5
mendations issued by the World Trade Organization Technical
factor (preferably 1.3) is t (s). To determine t , draw a line at
v v
Barriers to Trade (TBT) Committee.
t ×X parallel with the time axis. The intersection of this line
5
with the left branch of the curve is t . The intersection of this
2
line with the right branch of the curve is t :
3
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics Standards volume information, refer to the standard’s Document Summary page on
and is the direct responsibility of Subcommittee D20.30 on Thermal Proper- the ASTM website.
3
ties.30.08). The last approved version of this historical standard is referenced on
Current edition approved April 1, 2020. Published April 2020. Originally www.astm.org.
4
approved in 1979. Last previous edition approved in 2012 as D3795–00a (2012). Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
DOI: 10.1520/D3795-20. 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959. United States
1

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D3795 − 20
the test provides useful data to predict the processib
...

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: D3795 − 00a (Reapproved 2012) D3795 − 20
Standard Test Method for
Thermal Flow, Cure, and Behavior Properties of Pourable
1
Thermosetting Materials by Torque Rheometer
This standard is issued under the fixed designation D3795; 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 the apparatus, and a specific test method, including the evaluation of results required for the
determination of the thermal flow and cure behavior properties of pourable thermosetting materials.
1.2 This test method can be used:
1.2.1 As a control for the development and production of pourable thermosetting materials and to measure the different
properties (for example, melting behavior, cure behavior, etc.) as well as the influence of various additives and fillers in any given
formulations, and
1.2.2 Verify the uniformity of different production batches of the same formulation.
1.3 The values are stated in SI units.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. Specific precautions are given in Section 7.
NOTE 1—There is no similar or equivalent ISO standard.This standard is equivalent to the inactive ISO 15062. This standard and ISO 15252-2 address
the same subject matter, but differ in technical content.
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:
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
3
D1898 Practice for Sampling of Plastics (Withdrawn 1998)
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
4
2.2 ISO Standards:
ISO 15062 Plastics—Determination of the thermal-flow and cure behaviour of thermosetting materials by torque rheometry
ISO 15252-2 Plastics—Epoxy Powder Moulding Compounds (EP-PMCs)—Part 2: Preparation of Test Specimens And
Determination of Properties
3. Terminology
3.1 Definitions—For definitions of terms used in this test method and associated with plastics issues refer to the terminology
contained in Terminology D883.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 For the purpose of this test method, the following definitions apply, (see Fig. 1):
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.30 on Thermal Properties.30.08).
Current edition approved Oct. 1, 2012April 1, 2020. Published October 2012April 2020. Originally approved in 1979. Last previous edition approved in 20062012 as
D3795 – 00a (2006).(2012). DOI: 10.1520/D3795-00AR12.10.1520/D3795-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
4
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3795 − 20
NOTE 1—Top curve associated with temperature axis; bottom curve associated with torque axis.
FIG. 1 Torque Rheometer Curve
3.2.2 flow and cure behavior—the flow behavior is represented by the recorded torque curve from the loading peak (Point t ),
1
to the torque minimum (Point t ). The cure behavior is represented by the recorded torque curve from the torque minimum (Point
5
t ) to the torque maximum (Point t ). The rate of curing i
...