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ASTM D3288-97

(Test Method)

Standard Test Methods for Magnet-Wire Enamels

Standard Test Methods for Magnet-Wire Enamels

SCOPE
1.1 These test methods cover testing liquid enamel coatings used to produce film-insulated magnet wire.
1.2 The values stated in either lbs/gal or SI units are to be regarded separately as standard.  
1.3 The test methods appear as follows:  Sections Density 6 to 10 Determined Solids 16 to 22 Effective Solids 31 to 37 Flash Point 11 to 15 Infrared Analysis 42 to 47 Stack Loss 23 to 30 Viscosity 38 to 41
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Dec-1996
ICS
25.220.50 - Enamels
Technical Committee
D09 - Electrical and Electronic Insulating Materials
Current Stage
Ref Project

Relations

Replaced By
ASTM D3288-03 - Standard Test Methods for Magnet-Wire Enamels
Effective Date
10-Apr-2003
Referred By
ASTM D2832-92(2016) - Standard Guide for Determining Volatile and Nonvolatile Content of Paint and Related Coatings
Effective Date
01-Jan-1997
Referred By
ASTM D1711-22 - Standard Terminology Relating to Electrical Insulation
Effective Date
01-Jan-1997
Referred By
ASTM D996-23 - Standard Terminology of Packaging and Distribution Environments
Effective Date
01-Jan-1997

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ASTM D3288-97 - Standard Test Methods for Magnet-Wire Enamels
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 3288 – 97
Standard Test Methods for
Magnet-Wire Enamels
This standard is issued under the fixed designation D 3288; 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.
1. Scope E 131 Terminology Relating to Molecular Spectroscopy
E 168 Practices for General Techniques of Infrared Quanti-
1.1 These test methods cover testing liquid enamel coatings
tative Analysis
used to produce film-insulated magnet wire.
1.2 The values stated in either lbs/gal or SI units are to be
3. Significance and Use
regarded separately as standard.
3.1 These tests are useful for specification and control
1.3 The test methods appear as follows:
purposes during the manufacture, purchase, and use of the
Sections
magnet-wire enamels, and for determining uniformity of
Density 5-9
Determined Solids 15-21
batches.
Effective Solids 30-36
Flash Point 10-14
4. Sampling
Infrared Analysis 41-46
Stack Loss 22-29
4.1 Take a representative sample of liquid enamel and store
Viscosity 37-40
for future testing. Store the sample at room temperature in a
tightly sealed, nearly full container, unless otherwise specified.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the Use a container that is inert and impermeable to the wire
enamel. These precautions avoid either the escape of solvent or
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- reaction with the container and atmosphere. Glass and some
metals are suitable materials. Copper, iron, and aluminum are
bility of regulatory limitations prior to use.
unsatisfactory. After removing test specimens, use care to
2. Referenced Documents
restore these storage conditions.
2.1 ASTM Standards:
DENSITY
D 29 Test Methods for Sampling and Testing Lac Resins
,
3 4
D 56 Test Method for Flash Point by Tag Closed Tester
5. Scope
D 476 Specification for Titanium Dioxide Pigments
5.1 This test method covers the determination of the density
D 1298 Practice for Density, Relative Density (Specific
of magnet-wire enamel in terms of specific gravity or weight
Gravity), or API Gravity of Crude Petroleum and Liquid
3 per gallon.
Petroleum Products by Hydrometer Method
D 1475 Test Method for Density of Paint, Varnish, Lacquer,
6. Significance and Use
and Related Products
6.1 Density is useful for specification and control purposes
D 1638 Methods of Testing Urethane Foam Isocyanate Raw
during the manufacture and use of magnet-wire enamel.
Materials
6.2 The preferred method is Procedure A, hydrometer
D 5423 Specification for Forced-Convection Laboratory
7 method.
Ovens for Evaluation of Electrical Insulation
7. Procedure A—Hydrometer Method
7.1 Determine the specific gravity of the magnet-wire
enamel in accordance with Test Method D 1298 at 25.06
These test methods are under the jurisdiction of ASTM Committee D-9 on
Electrical and Electronic Insulating Materials and are the direct responsibility of
0.1°C.
Subcommittee D09.10 on Magnet Wire Insulation.
7.2 If weight per gallon is required, multiply the specific
Current edition approved March 10, 1997. Published February 1998. Originally
gravity by the weight per gallon of distilled water at the same
published as D 3288 – 73. Last previous edition D 3288 – 95.
temperature (8.31 lb/gal at 25.0°C).
Annual Book of ASTM Standards, Vol 06.03.
Annual Book of ASTM Standards, Vol 05.01.
Annual Book of ASTM Standards, Vol 04.09.
Annual Book of ASTM Standards, Vol 06.01.
Discontinued; see 1990 Annual Book of ASTM Standards, Vol 06.03.
7 8
Annual Book of ASTM Standards, Vol 10.02. Annual Book of ASTM Standards, Vol 14.01.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 3288
8. Procedure B—Weight per Gallon Method 17.3 The Effective Solids Procedure (see 34.1 and 35.1)
requires the Determined Solids value as an input.
8.1 Determine the weight per gallon of the magnet-wire
enamel in accordance with Test Method D 1475 at 25.06
18. Apparatus
0.1°C.
18.1 Forced-Convection Oven, capable of maintaining 200
6 2°C at the specified specimen location. Refer to Specifica-
9. Report
tion D 5423 for a representative oven.
9.1 Report the following information:
18.2 Weighing Dishes, aluminum, approximately 2 in. (51
9.1.1 Identification of the magnet-wire enamel, and
mm) in diameter, and ⁄8 in. (16 mm) height.
9.1.2 When using Procedure A, report the specific gravity to
18.3 Analytical Balance, capable of weighing to 60.1 mg.
the third decimal place, or
9.1.3 When using Procedure B, report the weight per gallon.
19. Procedure
19.1 Preheat dishes to remove oil. Five minutes at 200°C is
FLASH POINT
adequate.
10. Scope
19.2 Test not less than two specimens.
19.3 Place a 2.0 g specimen (60.1 mg) into a tared
10.1 This test method covers the determination of the flash
aluminum dish and weigh immediately.
point of magnet-wire enamel.
19.4 The weighed specimen must thoroughly cover the
11. Terminology
entire bottom surface of the weighing dish. Accomplish this by
warming the more viscous materials.
11.1 Definitions of Terms Specific to This Standard:
19.5 Place the dish and its contents in a 200 6 2°C
11.1.1 flash point, of magnet-wire enamel, n— the lowest
forced-convection oven for a predetermined period of time.
temperature at which magnet-wire enamel gives off flammable
19.6 Remove the dish from the oven and cool to room
vapor in sufficient quantity to ignite in air on application of a
temperature in a desiccator.
flame under specified conditions.
19.7 Weigh the dish and its contents (60.1 mg).
12. Significance and Use
20. Report
12.1 The flash point reveals the upper temperature limit at
20.1 Report the following information:
which a magnet-wire enamel may be stored or used without
20.1.1 Ratio of the weight of residue to that of the specimen,
presenting a fire hazard.
expressed as a percentage, as the determined solids content, S,
13. Procedure calculated as follows:
S5~Weight of residue/weight of specimen!3 100 (1)
13.1 Determine the flash point in accordance with Test
Method D 56.
20.1.2 Number of tests and individual values,
20.1.3 Average determined solids of all tests made, and
14. Report
20.1.4 Identification of the magnet-wire enamel.
14.1 Report the following information:
21. Precision and Bias
14.1.1 Identification of magnet-wire enamel, and
14.1.2 Flash point, degrees Celsius or Fahrenheit, prefer-
21.1 Precision:
ably in degrees Fahrenheit.
21.1.1 The results of all measurements on the sample should
agree within 60.5 %.
DETERMINED SOLIDS
21.2 Bias:
21.2.1 Statements of bias are not applicable in view of the
15. Scope
unavailability of a standard reference material for this property.
15.1 This test method covers the determination of a particu-
lar measured value for the solids content in a magnet-wire
STACK LOSS
enamel.
22. Scope
16. Terminology
22.1 This test method covers the determination of the stack
16.1 Definitions of Terms Specific to This Standard: loss of magnet-wire enamel applied to AWG No. 18 (1.02-mm)
electrical conductor using an inorganic material as a reference.
16.1.1 determined solids, of magnet-wire enamel, n—the
portion of a magnet-wire enamel which is not volatilized when
NOTE 1—With other sizes of electrical conductor, expect a variation in
exposed to specified conditions.
stack loss. This is particularly true with smaller diameter wire. Expect
difficulty in removing the coating from fine wire.
17. Significance and Use
23. Terminology
17.1 Determined solids is one of the critical factors in a
magnet-wire enamel that affects film build on a conductor. 23.1 Definitions of Terms Specific to This Standard:
17.2 The determined solids is also useful for control pur- 23.1.1 stack loss, of magnet-wire enamel, n— that portion
poses during the manufacture and use of magnet-wire enamel of the magnet-wire enamel solids which are lost during the
and in determining uniformity of batches. conductor-coating process.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 3288
24. Significance and Use 26.10 Remove the weighing bottle and contents from the
oven and allow it to cool to room temperature in a desiccator.
24.1 The stack loss of magnet-wire enamel will affect the
26.11 Weigh two conditioned crucibles and weigh into each
increase in dimensions, the amount of enamel used, the weight
0.5 to 0.6 g of the dried coating from the weighing bottle. Make
increase, and the economics of applying the enamel to the
all weighings to the nearest 0.1 mg.
conductor.
26.12 Weigh two conditioned crucibles and weigh into each
24.2 The Effective Solids procedure (see 33.2 and 34.1),
0.5 to 0.6 g of TiO .
requires the Stack Loss as an input but Stack Loss is in itself 2
26.13 Place all four crucibles in the cold muffle furnace.
not an absolute value.
Start the furnace, allowing the temperature to come to 600°C in
25. Apparatus and Reagent
1to2h.
25.1 Laboratory Magnet-
...

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