GB/T 5162-2021 English PDF (GBT5162-2021)

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GB/T 5162-2021: Metallic powders -- Determination of tap density
GB/T 5162-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160
CCS H 21
GB/T 5162-2021 / ISO 3953:2011
Replacing GB/T 5162-2006
Metallic Powders - Determination of Tap Density
(ISO 3953:2011, IDT)
ISSUED ON: MARCH 9, 2021
IMPLEMENTED ON: OCTOBER 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Principle ... 6
3 Symbols ... 6
4 Instruments and Equipment ... 6
5 Sample ... 8
6 Test Procedures ... 8
7 Result Expression ... 9
8 Test Report ... 9
Foreword
This document was drafted in accordance with the rules of GB/T 1.1-2020 Directives for
Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement of GB/T 5162-2006 Metallic Powders - Determination
of Tap Density. In comparison with GB/T 5162-2006, apart from structural adjustments and
editorial modifications, the main technical changes are as follows:
a) The Scope is modified (see Chapter 1; Chapter 1 of Version 2006);
b) “Upon negotiation and agreement, tapping can also adopt the mode of manual
operation” is deleted (see Chapter 2 of Version 2006);
c) “It shall have an appropriate measuring range and accuracy to satisfy the requirements
in Table 2” is modified into “It shall have an appropriate measuring range to satisfy
the requirements in Table 2, and the measurement mass accuracy is 0.1 g” (see 4.1;
4.1 of Version 2006);
d) The previous Table 2 is deleted (see 4.1 of Version 2006);
e) “The measurement accuracy is  0.1 cm3” is deleted (see 4.2 of Version 2006);
f) The labeling mode of the schematic diagram of the tapping device in Figure 1 is
modified (see Figure 1; Figure 1 of Version 2006);
g) The requirements for the tapping device are modified into “the tapping device allows
the graduated cylinder to be tapped on the anvil, and the tapping shall make the
powder compact, and the surface layer shall not have any looseness” (see 4.3; 4.3 of
Version 2006);
h) “The use of hard rubber boards (approximately 100 mm  100 mm  5 mm) and the
tapping mode of manual operation is only allowed upon negotiation and agreement”
is deleted (see 4.3 of Version 2006);
i) When using a 100 cm3 graduated glass cylinder for the test, the powder apparent
density shall be “ 1” is modified into “1 ~ 4” (see Table 2; Table 3 of Version 2006);
j) “For each type, take 3 samples for the test” is modified into “if possible, 3 samples
shall be taken for the test” (see 5.3; 5.3 of Version 2006);
k) “See Figure 1” is modified into “See NOTE” (see 6.3; 6.3 of Version 2006);
l) “Upon negotiation and agreement, tapping can also be carried out in the following
modes” is deleted (see 6.3 of Version 2006);
Metallic Powders - Determination of Tap Density
1 Scope
This document specifies a method for the determination of tap density, that is, the density of a
powder after it has been tapped in a container under specified conditions.
2 Principle
Put a certain amount of powder in the container and tap it through a tapping device, until the
volume of the powder no longer decreases. The mass of the powder divided by the volume after
tapping gives its tap density.
3 Symbols
The following symbols are applicable to this document, see Table 1.
4 Instruments and Equipment
4.1 Balance
The balance shall have an appropriate measuring range to satisfy the requirements of Table 2,
and the measurement accuracy of mass is 0.1 g.
4.2 Graduated Glass Cylinder
The volume of the calibrated graduated glass cylinder is 100 cm3, and the height of the
graduated portion is approximately 175 mm. The graduations shall be at an interval of 1 cm3
and the measurement accuracy is  0.5 cm3.
The volume of the calibrated graduated glass cylinder is 25 cm3, and the height of the graduated
portion is approximately 135 mm. The graduations shall be at an interval of 0.2 cm3.
The 25 cm3 cylinder is mainly used to measure powder with an apparent density greater than 4
g/cm3, especially metal powders that are difficult to melt, but it may also be used for powder
with a relatively low apparent density.
5---cam.
a Height of stroke.
Figure 1 -- Schematic Diagram of Tapping Device
5 Sample
5.1 The mass of powder required for each test is shown in Table 2.
5.2 Generally, powder is tested in accordance with the receiving status. Under certain
circumstances, dry powder is needed. If the powder is easily oxidized, drying shall be
performed in vacuum or inert gas. If the powder contains volatile substances, then, it cannot be
dried.
5.3 If possible, 3 samples shall be taken for the test.
6 Test Procedures
6.1 Use a test tube brush to clean the inner wall of the graduated cylinder (4.2), if possible, it
can be cleaned with a solvent, for example, acetone solution. If a solvent is used, before use,
the graduated cylinder shall be completely dry.
6.2 Use the balance (4.1) to weigh the mass of the sample in accordance with the requirements
of Table 2, accurate to 0.1 g.
6.3 Put the sample into the graduated cylinder. Pay attention to keep the surface of the powder
in a horizontal state. Place the graduated cylinder on the tapping device (4.3), tap it, until the
volume of the powder no longer decreases (see NOTE).
NOTE: in practice, the minimum number N of tapping required so that the powder volume no
longer changes can be determined. For the same type of powders, except for the specific