ASTM D411-08
(Test Method)Standard Test Methods for Shellac Used for Electrical Insulation (Withdrawn 2013)
Standard Test Methods for Shellac Used for Electrical Insulation (Withdrawn 2013)
SIGNIFICANCE AND USE
Polymerization time provides a measure of time during which shellac retains its plasticity and flow properties at the specified temperature before gelling or polymerizing to the tough rubbery insoluble form. This test is important in determining the quality of different lots, useful shelf-life, batch uniformity, and processing characteristics of shellac.
SCOPE
1.1 These test methods cover tests for shellac in the dry button or powder form to be used for electrical insulating purposes. Typically, shellac is used as a bonding agent for mica splittings and reconstituted mica paper products, or as a coating or adhesive for other material.
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.
Note 1—There is no similar or equivalent IEC standard.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
WITHDRAWN RATIONALE
These test methods cover tests for shellac in the dry button or powder form to be used for electrical insulating purposes. Typically, shellac is used as a bonding agent for mica splittings and reconstituted mica paper products, or as a coating or adhesive for other material.
Formerly under the jurisdiction of Committee 09 on Electrical and Electronic Insulating Materials, this test method was withdrawn in November 2013. This standard is being withdrawn without replacement because the products referenced in this standard are no longer used in the electrical industry.
General Information
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D411 − 08 AnAmerican National Standard
Standard Test Methods for
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Shellac Used for Electrical Insulation
This standard is issued under the fixed designation D411; 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.
1. Scope* 4. General Tests
1.1 These test methods cover tests for shellac in the dry 4.1 Each of the following tests shall be made in accordance
button or powder form to be used for electrical insulating with the procedures described in Test Methods D29:
purposes.Typically,shellacisusedasabondingagentformica
4.2 Sampling,
splittingsandreconstitutedmicapaperproducts,orasacoating
4.3 Insoluble Matter,
or adhesive for other material.
4.4 Iodine Number,
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4.5 Moisture Content,
standard.
4.6 Wax,
1.3 This standard does not purport to address all of the
4.7 Ash, and
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.8 Orpiment (Native arsenic trisulfide).
priate safety and health practices and determine the applica-
POLYMERIZATION TIME
bility of regulatory limitations prior to use.
NOTE 1—There is no similar or equivalent IEC standard.
5. Significance and Use
2. Referenced Documents
5.1 Polymerization time provides a measure of time during
2
which shellac retains its plasticity and flow properties at the
2.1 ASTM Standards:
specified temperature before gelling or polymerizing to the
D29 Test Methods for Sampling and Testing Lac Resins
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tough rubbery insoluble form. This test is important in deter-
(Withdrawn 2005)
mining the quality of different lots, useful shelf-life, batch
D1711 Terminology Relating to Electrical Insulation
uniformity, and processing characteristics of shellac.
D5032 Practice for Maintaining Constant Relative Humidity
by Means of Aqueous Glycerin Solutions
6. Apparatus
D6054 Practice for Conditioning Electrical Insulating Mate-
rials for Testing
6.1 Test Tubes and Wire Rack—Two 18-mm outside diam-
E104 Practice for Maintaining Constant Relative Humidity
eter glass test tubes, supported by a wire rack to a depth of 100
by Means of Aqueous Solutions
mm when placed in an oil bath. The test tubes must be
supported and maintained in a vertical position. The rack shall
3. Terminology
be constructed so as to permit free circulation of oil around the
3.1 Definitions—For definitions of terms used in this
test tubes.
standard, refer to Terminology D1711.
6.2 Oil Bath—Theoilbathshallbeconstructedwithheaters,
temperature control, and means of circulation to maintain the
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These methods are under the jurisdiction of ASTM Committee D09 on oil or other liquid at a temperature of 150 6 1°C at all points
Electrical and Electronic Insulating Materials and are the direct responsibility of
withinthebath.Theoilorotherliquidusedshallbeappropriate
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
for the design of the bath and for safety at the test temperature.
ing Compounds.
The bath shall be equipped with a thermometer, or other
Current edition approved May 1, 2008. Published June 2008. Originally
approvedin1935.Lastpreviouseditionapprovedin2003asD411 – 98(2003).DOI:
indicator or recorder, to indicate the oil temperature within
10.1520/D0411-08.
61°C.
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
6.3 Glass Rod—Asmooth glass rod about 3 mm in diameter
Standards volume information, refer to the standard’s Document Summary page on
and approximately 200 mm long. The end of the glass rod
the ASTM website.
3
which is to be immersed in the shellac shall be fire polished to
The last approved version of this historical standard is referenced on
www.astm.org. a smooth round end.
*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
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D411 − 08
NOTE 2—It is permissible to use a smooth glass rod about 5 mm in
11.1.1 The polymerization time in minutes for each speci-
diameter and approximately 200 mm long with an indicator mark at the
men, and
top to indicate movement. Flatten slightly the diameter of the glass rod for
11.1.2 The average of the values in 11.1.1.
approximately 3 mm length at the end which is immersed in the shellac.
The purpose of the flattened rod is to provide a more positive feel of th
...
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