ASTM D3056-05(2010)

Standard Test Method for Gel Time of Solventless Varnishes

SIGNIFICANCE AND USE
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 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.

General Information

• Status: Historical
• Publication Date: 30-Apr-2010
• ICS: 29.035.60 - Varnished fabrics
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.01 - Electrical Insulating Products

Relations

• Replaces: ASTM D3056-05 - Standard Test Method for Gel Time of Solventless Varnishes
• Effective Date: 01-May-2010
• Replaced By: ASTM D3056-14 - Standard Test Method for Gel Time of Solventless Varnishes
• Effective Date: 01-Nov-2014
• Referred By: ASTM D3955-20 - Standard Specification for Electrical Insulating Varnishes
• Effective Date: 01-May-2010
• Referred By: ASTM D4733-17 - Standard Test Methods for Solventless Electrical Insulating Varnishes
• Effective Date: 01-May-2010
• Referred By: ASTM D1711-22 - Standard Terminology Relating to Electrical Insulation
• Effective Date: 01-May-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D3056 − 05(Reapproved 2010)
Standard Test Method for
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
timeofasolventlessvarnishmixedwithacatalystandexposed
4. Significance and Use
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
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 6 1
NOTE1—AlthoughthisstandardandIEC60455–2differinapproachor
°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.
2.1 ASTM Standards:
6. Safety Precautions
D1711 Terminology Relating to Electrical Insulation
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
tubeisplacedinthebath.Waterisusefulupto100°C.Silicone
liquids must be used above 100 °C but are suitable for use at
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 May 1, 2010. Published September 2010. Originally
approved in 1972. Last previous edition approved in 2005 as D3056–05. DOI:
10.1520/D3056-05R10.
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 [e-mail]. 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 pro
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