ASTM D3312-04

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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An American National Standard
Designation:D3312–04
Standard Test Method for
1
Percent Reactive Monomer in Solventless Varnishes
This standard is issued under the fixed designation D3312; 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 3.2 See Terminology D1711 for definitions of other terms
relating to electrical insulation.
1.1 This test method covers the determination of the percent
of volatile reactive monomer having a vapor pressure exceed-
4. Significance and Use
ing 13.3 Pa (0.1 Torr) at 25 °C in an uncatalyzed solventless
4.1 The percent of reactive monomer in solventless var-
varnish. Experience has shown this method does not accurately
nisheswillaffecttheviscosity,thehandling,andtheprocessing
determine percent reactive monomer when the vapor pressure
properties of the uncured resin. The percent of reactive
is less than 13.3 Pa (0.1 Torr).
monomer will possibly affect the degree of hardness and
1.2 ThevaluesstatedinSIunitsarethestandard.Thevalues
shrinkage which in turn will affect the physical and electrical
given in parentheses are for information only.
properties of the cured resin.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Safety Precautions
responsibility of the user of this standard to establish appro-
5.1 It is unsafe to use varnish at temperatures above the
priate safety and health practices and determine the applica-
flash point without adequate ventilation, especially if the
bility of regulatory limitations prior to use. For a specific
possibility exists that flames or sparks are present. Store
precaution, see Section 5.
varnish in sealed containers.
NOTE 1—There is no similar or equivalent ISO/IEC standard.
6. Apparatus
2. Referenced Documents
6.1 Balance, capable of weighing to nearest 0.0001 g.
2
2.1 ASTM Standards:
6.2 Thermometer—A glass thermometer having a range
3
D1711 Terminology Relating to Electrical Insulation
from 0 to 200 °C (30 to 400 °F) and accurate within 61°C(6
D5423 Specification for Forced-Convection Laboratory
2 °F).
Ovens for Evaluation of Electrical Insulation
6.3 Oven—A forced-draft constant-temperature oven con-
forming to Specification D5423, Type II.
3. Terminology
6.4 Bottle and Drying Dishes—A stoppered bottle and
3.1 Definitions of Terms Specific to This Standard:
flat-bottomaluminumdryingdish.havinganinsidediameterof
3.1.1 reactive monomer, n—in solventless electrical varnish,
3 5
approximately 70 mm (2 ⁄4 in.) and a depth of 8 mm ( ⁄16 in.).
a substance, that, when added to a resin, will combine
6.5 Desiccator—Asuitabledesiccatorcontaininganhydrous
chemically with that resin under specified conditions.
calcium chloride (CaCl ).
2
7. Test Specimens
1
This test method is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of 7.1 Preparing Specimens—Place a portion of the uncata-
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu-
lyzed solventless varnish in a stoppered bottle and weigh.
lating Compounds.
Transfer a specimen weighing between 0.2 and 0.3 g from the
Current edition approved Sept. 1, 2004. Published September 2004. Originally
weighed stoppered bottle to a weighed drying dish, which has
approved in 1974. Last previous edition approved in 2000 as D3312 – 00. DOI:
10.1520/D3312-04.
been previously heated for 30 min at 150 °C (300 °F) and
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
cooled in a desiccator. Weigh the stoppered bottle with the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
remaining contents again. Determine the exact weight of the
Standards volume information, refer to the standard’s Document Summary page on
specimen transferred to the drying dish by the difference in
the ASTM website.
3
Withdrawn.
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D3312–04
weight of the stoppered bottle. Prepare two specimens from the 10. Report
contents of the stoppered bottle.
10.1 Report the following information:
10.1.1 Identification of the solventless varnish, and
8. Procedure
10.1.2 Percent reactive monomer.
8.1 Dilution of Specimens—Add 5 6 1 mL of methyl
isobutyl ketone (MIBK) to each specimen in the drying dish.
11. Precision and Bias
Mix the specimen and the MIBK by moving the drying dishes
11.1 Precision—The interlaboratory standard deviation cal-
in a circular direction. Mi
...