ASTM D3312-00

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An American National Standard
Designation: D 3312 – 00
Standard Test Method for
Percent Reactive Monomer in Solventless Varnishes
This standard is issued under the fixed designation D 3312; 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 properties of the uncured resin. The percent of reactive
monomer can also affect the degree of hardness and shrinkage
1.1 This test method covers the determination of the percent
which in turn will affect the physical and electrical properties
of volatile reactive monomer having a vapor pressure exceed-
of the cured resin.
ing 13.3 Pa (0.1 Torr) at 25°C in an uncatalyzed solventless
varnish. Experience has shown this method does not accurately
5. Safety Precautions
determine percent reactive monomer when the vapor pressure
5.1 It is unsafe to use varnish at temperatures above the
is less than 13.3 Pa (0.1 Torr).
flash point without adequate ventilation, especially if the
1.2 The values stated in SI units are the standard. The values
possibility exists that flames or sparks are present. Store
given in parentheses are for information only.
varnish in sealed containers.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Apparatus
responsibility of the user of this standard to establish appro-
6.1 Balance, capable of weighing to nearest 0.0001 g.
priate safety and health practices and determine the applica-
6.2 Thermometer—A glass thermometer having a range
bility of regulatory limitations prior to use. For a specific
from 0 to 200°C (30 to 400°F) and accurate within 6 1°C (6
precaution, see Section 5.
2°F).
NOTE 1—There is no similar or equivalent ISO/IEC standard.
6.3 Oven—A forced-draft constant-temperature oven con-
forming to Specification D 5423, Type II.
2. Referenced Documents
6.4 Bottle and Drying Dishes—A stoppered bottle and
2.1 ASTM Standards:
flat-bottom aluminum drying dish. having an inside diameter of
D 1711 Terminology Relating to Electrical Insulation
3 5
approximately 70 mm (2 ⁄4 in.) and a depth of 8 mm ( ⁄16 in.).
D 5423 Specification for Forced-Convection Laboratory
6.5 Desiccator—A suitable desiccator containing anhydrous
Ovens for Evaluation of Electrical Insulation
calcium chloride (CaCl ).
3. Terminology
7. Test Specimens
3.1 Definitions:
7.1 Preparing Specimens—Place a portion of the uncata-
3.1.1 reactive monomer, n— in solventless electrical var-
lyzed solventless varnish in a stoppered bottle and weigh.
nish, a substance, that, when added to a resin, will combine
Transfer a specimen weighing between 0.2 and 0.3 g from the
chemically with that resin under specified conditions.
weighed stoppered bottle to a weighed drying dish, which has
3.1.2 See Terminology D 1711 for definitions of other terms
been previously heated for 30 min at 150°C (300°F) and cooled
relating to electrical insulation.
in a desiccator. Weigh the stoppered bottle with the remaining
contents again. Determine the exact weight of the specimen
4. Significance and Use
transferred to the drying dish by the difference. Prepare two
4.1 The percent of reactive monomer in solventless var-
specimens from the contents of the stoppered bottle.
nishes will affect the viscosity, the handling, and the processing
8. Procedure
8.1 Dilution of Specimens—Add 5 6 1 mL of methyl
This test method is
...