ASTM D3312-04(2009)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D3312 − 04(Reapproved 2009) An American National Standard
Standard Test Method for
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 4. Significance and Use
4.1 The percent of reactive monomer in solventless var-
1.1 This test method covers the determination of the percent
nisheswillaffecttheviscosity,thehandling,andtheprocessing
of volatile reactive monomer having a vapor pressure exceed-
properties of the uncured resin. The percent of reactive
ing 13.3 Pa (0.1 Torr) at 25°C in an uncatalyzed solventless
monomer will possibly affect the degree of hardness and
varnish. Experience has shown this method does not accurately
shrinkage which in turn will affect the physical and electrical
determine percent reactive monomer when the vapor pressure
properties of the cured resin.
is less than 13.3 Pa (0.1 Torr).
1.2 ThevaluesstatedinSIunitsarethestandard.Thevalues
5. Safety Precautions
given in parentheses are for information only.
5.1 It is unsafe to use varnish at temperatures above the
1.3 This standard does not purport to address all of the
flash point without adequate ventilation, especially if the
safety concerns, if any, associated with its use. It is the
possibility exists that flames or sparks are present. Store
responsibility of the user of this standard to establish appro-
varnish in sealed containers.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For a specific
6. Apparatus
precaution, see Section 5.
6.1 Balance, capable of weighing to nearest 0.0001 g.
NOTE 1—There is no similar or equivalent ISO/IEC standard.
6.2 Thermometer—A glass thermometer having a range
from 0 to 200°C (30 to 400°F) and accurate within 61°C
2. Referenced Documents
(62°F).
2.1 ASTM Standards:
6.3 Oven—A forced-draft constant-temperature oven con-
D1711 Terminology Relating to Electrical Insulation
forming to Specification D5423, Type II.
D5423 Specification for Forced-Convection Laboratory Ov-
6.4 Bottle and Drying Dishes—A stoppered bottle and
ens for Evaluation of Electrical Insulation
flat-bottomaluminumdryingdish.havinganinsidediameterof
3 5
approximately 70 mm (2 ⁄4 in.) and a depth of 8 mm ( ⁄16 in.).
3. Terminology
6.5 Desiccator—Asuitable desiccator containing anhydrous
3.1 Definitions of Terms Specific to This Standard:
calcium chloride (CaCl ).
3.1.1 reactive monomer, n—in solventless electrical varnish,
a substance, that, when added to a resin, will combine
7. Test Specimens
chemically with that resin under specified conditions.
7.1 Preparing Specimens—Place a portion of the uncata-
3.2 See Terminology D1711 for definitions of other terms lyzed solventless varnish in a stoppered bottle and weigh.
relating to electrical insulation. Transfer a specimen weighing between 0.2 and 0.3 g from the
weighed stoppered bottle to a weighed drying dish, which has
beenpreviouslyheatedfor30minat150°C(300°F)andcooled
in a desiccator. Weigh the stoppered bottle with the remaining
This test method is under the jurisdiction of ASTM Committee D09 on
contents again. Determine the exact weight of the specimen
Electrical and Electronic Insulating Materials and is the direct responsibility of
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
transferred to the drying dish by the difference in weight of the
ing Compounds.
stoppered bottle. Prepare two spec
...