ASTM D3056-14
(Test Method)Standard Test Method for Gel Time of Solventless Varnishes
Standard Test Method for Gel Time of Solventless Varnishes
SIGNIFICANCE AND USE
4.1 Gel time is important in determining batch uniformity and some processing characteristics. It is indicative of pot life and shelf life.
SCOPE
1.1 This test method covers the determination of the gel time of a solventless varnish mixed with a catalyst, if required, and exposed to elevated temperature.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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. For a specific precaution statement, see Section 6.
Note 1: Although this standard and IEC 60455–2 differ in approach or detail, data obtained using either are technically equivalent.
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Designation: D3056 − 14
Standard Test Method for
1
Gel Time of Solventless Varnishes
This standard is issued under the fixed designation D3056; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 3.1.2 See Terminology D1711 for definitions of other terms
relating to electrical insulation.
1.1 This test method covers the determination of the gel
time of a solventless varnish mixed with a catalyst, if required,
4. Significance and Use
and exposed to elevated temperature.
4.1 Gel time is important in determining batch uniformity
1.2 The values stated in SI units are to be regarded as
and some processing characteristics. It is indicative of pot life
standard. No other units of measurement are included in this
and shelf life.
standard.
1.3 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
4
5.1 Gel Time Apparatus.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5.2 Power Supply, 110 V ac variable.
bility of regulatory limitations prior to use. For a specific
5.3 Balance, with accuracy to the nearest 0.01 g.
precaution statement, see Section 6.
5.4 Temperature Controller, capable of maintaining to
NOTE1—AlthoughthisstandardandIEC60455–2differinapproachor
61°C.
detail, data obtained using either are technically equivalent.
5.5 Magnetic Stirrer, with a magnetized stirring bar coated
2. Referenced Documents
with a tetrafluoroethylene.
2
2.1 ASTM Standards:
6. Safety Precautions
D1711 Terminology Relating to Electrical Insulation
3
2.2 IEC Standard:
6.1 It is unsafe to use varnish at temperatures above the
IEC 60455–2 Resin Based Reactive Compounds Used for flash point without adequate ventilation, especially if the
Electrical Insulation—Part 2: Methods of Test
possibility exists that flames or sparks are present. Store
varnish in sealed containers.
3. Terminology
7. Procedure
3.1 Definitions:
3.1.1 gel time, n—of solventless varnish, the time required
7.1 Set up the gel time apparatus as described in the
at a specified temperature for a solventless varnish to be
instruction manual supplied by the manufacturer.
transformed from a liquid state to a gel as measured with a
7.2 Fillthebathwithwaterorasiliconeliquidtocompletely
suitable gel time apparatus.
immerse the test specimen of solventless varnish when the test
tube is placed in the bath.Water is useful up to 100°C. Silicone
liquids must be used above 100°C but are suitable for use at
1
This test method is under the jurisdiction of ASTM Committee D09 on
lower temperatures.
Electrical and Electronic Insulating Materials and is the direct responsibility of
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
NOTE 2—The silicone liquid will be DC-200 or equivalent.
ing Compounds.
Current edition approved Nov. 1, 2014. Published November 2014. Originally
approved in 1972. Last previous edition approved in 2010 as D3056 – 05 (2010).
DOI: 10.1520/D3056-14.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The sole source of supply of the apparatus known to the committee at this time
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM is Sunshine Gel Time Meter, Catalog No. 22, manufactured by Sunshine Scientific
Standards volume information, refer to the standard’s Document Summary page on Instruments, 1810 Grant Ave., Philadelphia, PA 19115. If you are aware of
the ASTM website. alternative suppliers, please provide this information to ASTM International
3
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St., Headquarters.Your comments will receive careful consideration at a meeting of the
4
4th Floor, New York, NY 10036, http://www.ansi.org. responsible technical committee, which you may attend.
*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 ----------------------
D3056 − 14
7.3 Place the bath on the magnetic stirrer, and insert the 8.1.2 Name and amount of catalyst used,
stirring bar into the bath. Connect the heating coil to the 8.1.3 Gel time to the nearest 0.1 min, and
temperature controller. Start the cold water on the bath con- 8.1.4 Temperature of the bath and the liquid used.
denser.
9. Precision and Bias
7.4 Adjust the bath to the desired temperature.
9
...
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: D3056 − 05 (Reapproved 2010) D3056 − 14
Standard Test Method for
1
Gel Time of Solventless Varnishes
This standard is issued under the fixed designation D3056; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope Scope*
1.1 This test method covers the determination of the gel time of a solventless varnish mixed with a catalyst catalyst, if required,
and exposed to elevated temperature.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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. For a specific precaution statement, see Section 6.
NOTE 1—Although this standard and IEC 60455–2 differ in approach or detail, data obtained using either are technically equivalent.
2. Referenced Documents
2
2.1 ASTM Standards:
D1711 Terminology Relating to Electrical Insulation
3
2.2 IEC Standard:
IEC 60455–2 Resin Based Reactive Compounds Used for Electrical Insulation — Part Insulation—Part 2: Methods of Test
3. Terminology
3.1 Definitions:
3.1.1 gel time, n—of solventless varnish, the time required at a specified temperature for a solventless varnish to be transformed
from a liquid state to a gel as measured with a suitable gel time apparatus.
3.1.2 See Terminology D1711 for definitions of other terms relating to electrical insulation.
4. Significance and Use
4.1 Gel time is important in determining batch uniformity and some processing characteristics. It is indicative of pot life and
shelf life.
5. Apparatus
4
5.1 Gel Time ApparatusApparatus. .
5.2 Power Supply, 110 V ac variable.
5.3 Balance, with accuracy to the nearest 0.01 g.
5.4 Temperature Controller, capable of maintaining to 6 1 °C.61°C.
5.5 Magnetic Stirrer, with a magnetized stirring bar coated with a tetrafluoroethylene.
1
This test method is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee
D09.01 on Electrical Insulating Varnishes, Powders and Encapsulating Compounds.
Current edition approved May 1, 2010Nov. 1, 2014. Published September 2010November 2014. Originally approved in 1972. Last previous edition approved in 20052010
as D3056D3056 – 05 (2010).–05. DOI: 10.1520/D3056-05R10.10.1520/D3056-14.
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.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
4
The sole source of supply of the apparatus known to the committee at this time is Sunshine Gel Time Meter, Catalog No. 22, manufactured by Sunshine Scientific
Instruments, 1810 Grant Ave., Philadelphia, PA 19115. If you are aware of alternative suppliers, please provide this information to ASTM International Headquarters. Your
4
comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
*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 ----------------------
D3056 − 14
6. Safety Precautions
6.1 It is unsafe to use varnish at temperatures above the flash point without adequate ventilation, especially if the possibility
exists that flames or sparks are present. Store varnish in sealed containers.
7. Procedure
7.1 Set up the gel time apparatus as described in the instruction manual supplied by the manufacturer.
7.2 Fill the bath with water or a silicone liquid to completely immerse the test specimen of solventless varnish when the test
tube is placed in the bath. Water is useful up to 100 °C. 100°C. Silicone liquids must be used above 100 °C 100°C but are suitable
for use at lower temperatures.
NO
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