ASTM D4559-99(2004)
(Test Method)Standard Test Method for Volatile Matter in Silicone Fluid
Standard Test Method for Volatile Matter in Silicone Fluid
SIGNIFICANCE AND USE
High values may indicate contamination of the silicone with other materials, inadequate removal of volatile components by the producer, or the presence of a depolymerization catalyst.
The outcome will be affected directly by the presence of any high vapor pressure material in the sample, such as solvents or low molecular weight silicones.
A high volatile content could also indicate the presence of a depolymerization catalyst in the fluid. The time and temperature specified in this test method are ideal for detecting the effect of such a material, as the depolymerization takes place at a highly accelerated rate and the low molecular weight components are rapidly evaporated. The result is a very significant weight loss during the test period. The exact amount depends on the type and amount of catalyst present. The conditions specified in the method should not cause measureable depolymerization of silicone if such a catalyst is not present.
SCOPE
1.1 This test method describes a procedure for determining the volatile matter in silicone fluids used for electrical insulation.
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 whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4559– 99 (Reapproved2004)
Standard Test Method for
Volatile Matter in Silicone Fluid
This standard is issued under the fixed designation D4559; 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 the effect of such a material, as the depolymerization takes
place at a highly accelerated rate and the low molecular weight
1.1 This test method describes a procedure for determining
components are rapidly evaporated. The result is a very
the volatile matter in silicone fluids used for electrical insula-
significantweightlossduringthetestperiod.Theexactamount
tion.
depends on the type and amount of catalyst present. The
1.2 This standard does not purport to address all of the
conditions specified in the method should not cause measure-
safety concerns, if any, associated with its use. It is the
able depolymerization of silicone if such a catalyst is not
responsibility of whoever uses this standard to consult and
present.
establish appropriate safety and health practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Apparatus
2. Referenced Documents 5.1 Air-circulating Oven, capable of meeting the require-
2 ments of Specification D5423.
2.1 ASTM Standards:
5.2 Griffın Pyrex Beakers, 50-mL, with the following di-
D923 Practices for Sampling Electrical Insulating Liquids
mensions:
D2225 Test Methods for Silicone Fluids Used for Electrical
5.2.1 Outside Diameter—42 6 0.6 mm.
Insulation
5.2.2 Wall Thickness—0.14 to 0.165 mm.
D4652 Specification for Silicone Fluid Used for Electrical
5.3 Analytical Balance, capable of measuring to 1 mg.
Insulation
D5423 Specification for Forced-Convection Laboratory
6. Sampling
Ovens for Evaluation of Electrical Insulation
6.1 Obtain a sample of the silicone fluid to be tested using
3. Summary of Test Method appropriateASTM sampling apparatus in accordance withTest
Methods D923.
3.1 Specimens are weighed before and after heating for a
specific time in a forced air oven to determine weight loss.
7. Procedure
4. Significance and Use 7.1 Clean two 50-mL beakers by washing in toluene,
followed by a rinse in acetone or other appropriate cleaning
4.1 High values may indicate contamination of the silicone
method.
with other materials, inadequate removal of volatile compo-
7.2 Bake two 50-mL beakers at 150 6 5°C for a minimum
nents by the producer, or the presence of a depolymerization
of 1 h, transfer to a desiccator using clean, dry gloves or
catalyst.
crucible tongs and cool the beakers to ambient temperatures.
4.2 The outcome will be affected directly by the presence of
Use clean, dry gloves or crucible tongs to handle beakers from
any high vapor pressure material in the sample, such as
this point forward. Weigh each beaker to the nearest mg (T).
solvents or low molecular weight silicones.
7.3 Weigh a 2.0 6 0.2 g sample to the nearest mg in each
4.3 A high volatile content could also indicate the presence
beaker (W ).
of a depolymerization catalyst in the fluid. The time and
7.4 Heat at 150 6 5°C in an air circulating oven for 24 6
temperature specified in this test method are ideal for detecting
0.25 h, cool in a desiccator, and reweigh (W ).
8. Calculation a
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