ASTM D2772-90(1997)e1
(Test Method)Standard Test Method for Sieve Analysis of Electrical Grade Magnesium Oxide (Withdrawn 2003)
Standard Test Method for Sieve Analysis of Electrical Grade Magnesium Oxide (Withdrawn 2003)
SCOPE
1.1 This test method covers the determination of the particle size distribution in a representative sample of granular electrical grade magnesium oxide.
1.2 The values stated in acceptable metric units are to be regarded as the standard.
1.3 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
Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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An American National Standard
e1
Designation: D 2772 – 90 (Reapproved 1997)
Standard Test Method for
Sieve Analysis of Electrical Grade Magnesium Oxide
This standard is issued under the fixed designation D 2772; 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.
e NOTE— Keywords were added editorially in October 1997.
1. Scope 4.6 Nonmetallic Brush.
4.7 Small Rubber-Rod or Mallet.
1.1 This test method covers the determination of the particle
size distribution in a representative sample of granular electri-
5. Calibration of Sieves
cal grade magnesium oxide.
5.1 Each test station should possess two sets of sieves. The
1.2 The values stated in acceptable metric units are to be
first set should be in normal use. The second set should be kept
regarded as the standard.
as a calibration set and run on a comparison sample with the
1.3 This standard does not purport to address all of the
first set after every 50 sieve analyses.
safety concerns, if any, associated with its use. It is the
5.2 When the sieves on the first set wear out, they shall be
responsibility of the user of this standard to establish appro-
replaced by ones from the second set. New sieves shall be
priate safety and health practices and determine the applica-
obtained to replace the second or calibration set.
bility of regulatory limitations prior to use.
5.3 Sieve openings may be checked using one of the
following methods:
2. Referenced Documents
5.3.1 Comparison with a New Sieve—This may be done by
2.1 ASTM Standards:
obtaining two similar 100-g test samples of MgO from the
D 2755 Test Method of Sampling and Reduction to Test
same lot of material, using Test Method D 2755. One sample
Weight of Electrical Grade Magnesium Oxide
lot of material should then be put through each sieve, using the
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
same procedure. The amount of MgO through the sieve being
poses
tested must be within a tolerance of 63 % by weight when
compared with that put through the new sieve.
3. Summary of Test Method
5.3.2 Follow the Procedure Outlined in Specification E 11.
3.1 A representative sample of MgO is sifted through a
Table 1 is from Specification E 11.
series of sieves and the amount caught on each sieve is
5.4 Sieve openings should be checked ( a) if a sieve
weighed and recorded as a percentage of the total sample.
becomes slack, (b) if a sieve becomes clogged and (c) when a
sieve has been used 200 times or after a period of 6 months,
4. Apparatus
4 whichever occurs first.
4.1 Sieve Shaker.
5.5 Sieves used for testing electrical grade MgO should be
4.2 U. S. Standard Brass or Stainless Steel Sieve—(half-
used for this purpose only.
height):
5.6 Sieves should be kept clean by using a soft brush and
4.2.1 Required: 40, 60, 80, 100, 140, 200, 325, pan, and
when necessary, may be cleaned by using (a) a trichloroethyl-
cover.
ene degreaser, (b) ultrasonic cleaning, or (c) by tapping with a
4.2.2 Optional: 35, 45, 50, 120, and 170.
small rubber hammer. Wire brushes should not be used.
4.3 Timer.
4.4 Triple-Beam Balance.
6. Procedure
4.5 Receiving Pan, approximately 20 cm (8 in.) long by 10
6.1 Nest the desired sieves in order, with the coarsest being
cm (4 in.) wide by 7.6 cm (3 in.) deep.
uppermost and the pan being on the bottom.
6.2 Obtain a sample between 100 and 125 g, using Test
This method is under the jurisdiction of ASTM Committee D-9 on Electrical
Method D 2755.
and Electronic Insul
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