ASTM D2773-94

Standard Test Method for Loss on Ignition of Electrical Grade Magnesium Oxide (Withdrawn 2002)

SCOPE
1.1 This test method covers the determination of the loss on ignition of electrical grade magnesium oxide for use in sheathed heating units.  
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.

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1993
• ICS: 71.060.20 - Oxides
• Technical Committee: D09 - Electrical and Electronic Insulating Materials

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 2773 – 94 An American National Standard
Standard Test Method for
Loss on Ignition of Electrical Grade Magnesium Oxide
This standard is issued under the fixed designation D 2773; 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 6.2 From the sample, take at least two specimens of 206 1
g each.
1.1 This test method covers the determination of the loss on
ignition of electrical grade magnesium oxide for use in
7. Procedure
sheathed heating units.
7.1 Heat the platinum crucible with lid at 1000 6 25°C in
1.2 This standard does not purport to address all of the
the muffle furnace for at least 10 min. Remove the crucible
safety concerns, if any, associated with its use. It is the
from the furnace and cool to room temperature in a desiccator.
responsibility of the user of this standard to establish appro-
Weigh the crucible and lid to the nearest 0.1 mg.
priate safety and health practices and determine the applica-
7.2 Transfer sample to the crucible, cover immediately with
bility of regulatory limitations prior to use.
a lid, and weigh to the nearest 0.1 mg.
2. Referenced Documents 7.3 Place the crucible with specimen in the muffle furnace at
1000 6 25°C, and ignite the sample for1hat this temperature.
2.1 ASTM Standards:
7.4 Remove the crucible from the furnace and place imme-
D 2755 Test Method of Sampling and Reduction to Test
diately in desiccator. Loosen the crucible lid and leave slightly
Weight of Electrical Grade Magnesium Oxide
ajar to allow for outgasing of the material during the evacua-
3. Summary of Test Method
tion process. Close the desiccator and apply vacuum. Evacuate
the desiccator to below 2 mm (266 Pa) Hg pressure (Note 1)
3.1 The loss on ignition is the free and combined moisture
and maintain vacuum until the sample is cooled to room
together with any carbonaceous impurities that are volatilized
temperature (Note 2).
at 1000°C, their loss calculated as a percentage of the original
weight.
NOTE 1—Avoid sudden evacuation of the desiccator which could lead
to dust loss.
4. Significance and Use
NOTE 2—Under normal conditions, a cooling period of at least 12 h is
required.
4.1 Magnesium oxide, being a hygroscopic material, can
contain sufficient moisture that is detrimental to the manufac-
7.5 Remove the crucible with specimen and lid, and imme-
turing process and performance of sheathed heating elements.
diately weigh to the nearest 0.1 mg.
7.6 Perform at least two determinations to obtain the aver-
5. Apparatus
age loss on ignition.
5.1 Balance, capable of weighing to 60.1 mg.
8. Calculation
5.2 Platinum Crucible, of 15-cm capacity, with lid.
5.3 Muffle Furnace, capable of 1000°C temperature.
8.1 Calculate the percentage loss on
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