ASTM D3056-05

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An American National Standard
Designation:D3056–05
Standard Test Method for
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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 Department of Defense.
1. Scope 4. Significance and Use
1.1 This test method covers the determination of the gel 4.1 Gel time is important in determining batch uniformity
timeofasolventlessvarnishmixedwithacatalystandexposed and some processing characteristics. It is indicative of pot life
to elevated temperature. and shelf life.
1.2 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
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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.
5.3 Balance, with accuracy to the nearest 0.01 g.
bility of regulatory limitations prior to use. For a specific
precaution statement, see Section 6. 5.4 Temperature Controller, capable of maintaining to 6 1
°C.
NOTE 1—AlthoughthisstandardandIEC 60455–2differinapproachor
5.5 Magnetic Stirrer, with a magnetized stirring bar coated
detail, data obtained using either are technically equivalent.
with a tetrafluoroethylene.
2. Referenced Documents
6. Safety Precautions
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2.1 ASTM Standards:
6.1 It is unsafe to use varnish at temperatures above the
D1711 Terminology Relating to Electrical Insulation
flash point without adequate ventilation, especially if the
2.2 IEC Standard:
possibility exists that flames or sparks are present. Store
IEC 60455–2 Resin Based Reactive Compounds Used for
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varnish in sealed containers.
Electrical Insulation — Part 2: Methods of Test
7. Procedure
3. Terminology
7.1 Set up the gel time apparatus as described in the
3.1 Definitions:
instruction manual supplied by the manufacturer.
3.1.1 gel time, n—of solventless varnish, the time required
7.2 Fillthebathwithwaterorasiliconeliquidtocompletely
at a specified temperature for a solventless varnish to be
immerse the test specimen of solventless varnish when the test
transformed from a liquid state to a gel as measured with a
tubeisplacedinthebath.Waterisusefulupto100°C.Silicone
suitable gel time apparatus.
liquids must be used above 100 °C but are suitable for use at
3.1.2 See Terminology D1711 for definitions of other terms
lower temperatures.
relating to electrical insulation.
NOTE 2—The silicone liquid will be DC-200 or equivalent.
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7.3 Place the bath on the magnetic stirrer, and insert the
This test method is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of
stirring bar into the bath. Connect the heating coil to the
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
temperature controller. Start the cold water on the bath con-
ing Compounds.
denser.
Current edition approved Sept. 1, 2005. Published September 2005. Originally
approved in 1972. Last previous edition approved in 2000 as D3056 – 00. DOI:
10.1520/D3056-05
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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
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Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St., Headquarters.Your comments will receive careful consideration at a meeting of the
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4th Floor, New York, NY 10036. responsible technical committee, which you may attend. DOI: 10.1520/D3056-05.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3056–05
7.4 Adjust the bath to the desired temperature. 8.1.4 Temperature of the bath and the liquid used.
7.5 If the varnish requires the addition of catalyst, weigh
9. Precision and Bias
100 6 1 g of solventless varnish into a 150-mL beaker and
9.1 Precision—The data inTable 1 are the combined results
record the mass to the nearest 0.01 g.
7.6 Weigh the desired amount of catalyst to an accuracy of
TABLE 1 Round-
...