ASTM D2755-90(1997)e1

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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 2755 – 90 (Reapproved 1997)
Standard Test Method of
Sampling and Reduction to Test Weight of Electrical Grade
Magnesium Oxide
This standard is issued under the fixed designation D 2755; 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 in October 1997.
1. Scope 3.2 Scoop.
3.3 Blender—Any commercially acceptable blender with a
1.1 This test method covers techniques for sampling large
45 kg (100 lb) minimum capacity.
lots of magnesium oxide (MgO) and reducing representative
samples to test weight.
4. Procedure
1.2 The values stated in acceptable metric units are to be
4.1 For Reduction of Bulk (— Approximately 45 kg (100
regarded as the standard. The values in parentheses may be
lb)) Quantities:
approximate.
4.1.1 Blend the entire content of one or more standard
1.3 This standard does not purport to address the safety
containers for a minimum of 15 min in a suitable sized blender.
problems associated with its use. It is the responsibility of the
4.1.2 Remove 1 L of material in a minimum of five scoops
user of this standard to establish appropriate safety and health
from the various parts of the blender.
practices and determine the applicability of regulatory limita-
4.2 For Reduction of 1 L Samples:
tions prior to use.
4.2.1 Pour the sample evenly into the splitter, across the
2. Referenced Documents splitter opening.
4.2.2 When the entire sample has been poured through, tap
2.1 ASTM Standards:
the side of the splitter to make sure no build-up has occurred.
D 2772 Test Method for Sieve Analysis of Electrical Grade
Discard the content of one pan.
Magnesium Oxide
4.2.3 If a smaller sample is required, repeat the splitting
3. Apparatus
process.
3.1 Splitter, consisting of a series of chutes fed by a single
5. Precision
hopper. The chutes are so placed that each alternate chute
5.1 When samples from both sides of the splitter are tested
discharges to the same side of the sampler. The spacing of
in accordance with Test Method D 2772, the percent weight
1 1
plates must remain 1.6 to 3.2 mm ( ⁄16 to ⁄8 in.). The splitter
retained on any given sieve shall be within 3.0 % of the
should be capable of obtaining homogeneous splits.
average p
...