ASTM B527-93(2000)e1
(Test Method)Standard Test Method for Determination of Tap Density of Metallic Powders and Compounds
Standard Test Method for Determination of Tap Density of Metallic Powders and Compounds
SCOPE
1.1 This test method specifies a method for the determination of tap density (packed density) of metallic powders and compounds, that is, the density of a powder that has been tapped, to settle contents, in a container under specified conditions.
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.
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Designation:B527–93(Reapproved 2000)
Standard Test Method for
Determination of Tap Density of Metallic Powders and
Compounds
This standard is issued under the fixed designation B 527; 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—All referenced documents, except Practice B 215, were deleted editorially from Section 2.
TABLE 1 Accuracy and Capacity of Balance
1. Scope
3 3
Cylinder Capacity, cm Apparent Density, g/cm Mass of Test Portion, g
1.1 This test method specifies a method for the determina-
100 >1 100 6 0.5
tion of tap density (packed density) of metallic powders and
100 <1 50 6 0.2
compounds, that is, the density of a powder that has been
25 >7 100 6 0.5
tapped, to settle contents, in a container under specified
25 2to7 50 6 0.2
25 <2 20 6 0.1
conditions.
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 appro-
4.2.1.1 Graduated Glass Cylinder, calibrated to contain 25
priate safety and health practices and determine the applica-
cm at 20°C, the height of the graduated portion being
bility of regulatory limitations prior to use.
approximately 135 mm. The graduations shall be at 0.2 cm
2. Referenced Documents
intervals.
4.2.1.2 A 25-cm cylinder shall be used for powders of
2.1 ASTM Standards:
apparent density higher than 4 g/cm , in particular for refrac-
B 215 Practice for Sampling Finished Lots of Metal Pow-
tory metal powders, but may also be used for powder of lower
ders
apparent density.
3. Significance and Use
4.3 Tapping Apparatus, which permits the tapping of the
graduated cylinder against a firm base. The tapping shall be
3.1 This test method covers the evaluation of the tapped
such that a densification of the powder can take place without
density physical characteristic of metallic powders and com-
any loosening of its surface layers. The stroke shall be 3 mm
pounds. The degree of correlation between the results of this
(0.118 in.) and the tapping frequency shall be between 100 and
test method and the quality of powders in use will vary with
300 taps/min. An example of a tapping apparatus is shown in
each particular application and has not been fully determined.
Fig. 1.
4. Apparatus
5. Test Specimen
4.1 Balance, of appropriate capacity and accuracy to satisfy
5.1 For the quantities of powder required for each test, see
the requirements shown in Table 1.
Table 1. Obtain test powder samples according to Practices
4.2 Graduated Glass Cylinder, calibrated to contain 100
B 215.
cm at 20°C, the height of the graduated portion being
5.2 In general, the powder should be tested in the as-
approximately 175 mm. The graduations shall be at 1 cm
received condition. In certain instances the powder may be
intervals, thus allowing a measuring accuracy of 6 0.5 cm .
3 3
dried. However, if the powder is susceptible to oxidation, the
For apparent densities over 4.0 g/cm , do not use the 100 cm
drying shall take place in a vacuum or in inert gas. If the
cylinder.
powder contains volatile substances, it shall not be dried.
4.2.1 Alternatively, the following may be used:
5.3 The test shall be carried out on three test samples.
This specification is under the jurisdiction ofASTM Committee B09 on Metal
Powders and Metal Powder Productsand is the direct responsibility of Subcommit-
tee B09.03on Refractory Metal Powders. The following have been found suitable: Shandon Southern Instruments, Inc.,
Current edition approved Dec. 15, 1993. Published April 1994. Originally Tap-Pak Volumeter Model JEL-ST2 (Manufactured by J. Engelsmann A.G. or
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published as B 527 – 70. Last previous edition B 527 – 85 (1991). Ludwigshafen 9. Rh. West Germany), 515 Broad Street, Sewickly, PA
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