ASTM D3056-00

Standard Test Method for Gel Time of Solventless Varnishes

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 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 (1998-12) "Resin Based Reactive Compounds Used for Electrical Insulation-Part 2: Methods of Test" differ in approach or detail, data obtained using either are technically equivalent.

General Information

• Status: Historical
• Publication Date: 09-Nov-2000
• ICS: 29.035.60 - Varnished fabrics
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.01 - Electrical Insulating Products

Relations

• Replaced By: ASTM D3056-05 - Standard Test Method for Gel Time of Solventless Varnishes
• Effective Date: 01-Sep-2005
• Referred By: ASTM D3955-20 - Standard Specification for Electrical Insulating Varnishes
• Effective Date: 10-Nov-2000
• Referred By: ASTM D4733-17 - Standard Test Methods for Solventless Electrical Insulating Varnishes
• Effective Date: 10-Nov-2000
• Referred By: ASTM D1711-22 - Standard Terminology Relating to Electrical Insulation
• Effective Date: 10-Nov-2000

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
An American National Standard
Designation:D3056–00
Standard Test Method for
Gel Time of Solventless Varnishes
This standard is issued under the fixed designation D 3056; 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 (e) 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
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 a-c 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—Although this standard and IEC 60455–2 (1998–12) “Resin
5.5 Magnetic Stirrer, with a magnetized stirring bar coated
Based Reactive Compounds Used for Electrical Insulation-Part 2: Meth-
with a tetrafluoroethylene.
ods of Test” differ in approach or detail, data obtained using either are
technically equivalent.
6. Safety Precautions
2. Referenced Documents
6.1 It is unsafe to use varnish at temperatures above the
2.1 ASTM Standards: flash point without adequate ventilation, especially if the
possibility exists that flames or sparks are present. Store
D 1711 Terminology Relating to Electrical Insulation
2.2 IEC Standard: varnish in sealed containers.
IEC 60455–2 (1998–12) Resin Based Reactive Compounds
3 7. Procedure
Used for Electrical Insulation — Part 2: Methods of Test
7.1 Set up the gel time apparatus as described in the
3. Terminology
instruction manual supplied by the manufacturer.
7.2 Fillthebathwithwaterorasiliconeliquidtocompletely
3.1 Definitions:
3.1.1 gel time, n—of solventless varnish, the time required immerse the test specimen of solventless varnish when the test
tube is placed in the bath.Water is useful up to 100°C. Silicone
at a specified temperature for a solventless varnish to be
transformed from a liquid state to a gel as measured with a liquids must be used above 100°C but are suitable for use at
lower temperatures.
suitable gel time apparatus.
3.1.2 SeeTerminology D 1711 for definitions of other terms
NOTE 2—The silicone liquid will be DC-200 or equivalent.
relating to electrical insulation.
7.3 Place the bath on the magnetic stirrer, and insert the
stirring bar into the bath. Connect the heating coil to the
1 temperature controller. Start the cold water on the bath con-
This test method is under the jurisdiction of ASTM Committee D09 on
denser.
Electrical and Electronic Insulating Materials and is the direct responsibility of
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu-
lating Compounds.
Current edition approved Nov. 10, 2000. Published January 2001. Originally Sunshine Gel Time Meter, Catalog No. 22, manufactured
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