GB/T 11986-1989 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 11986-1989 | English | 120 |
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Surface active agents. Powders and granules. Mesurement of the angle of repose
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GB/T 11986-1989: Surface active agents. Powders and granules. Mesurement of the angle of repose---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT11986-1989
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
GB 11986-89
ISO 4324-1977
Surface active agents - Powers and Granules - Measurement
of the angle of repose
Issued on: DECEMBER 25, 1989
Implemented on: DECEMBER 01, 1990
Issued by. The State Bureau of Quality and Technical Supervision
Table of Contents
1 Scope and field of application... 3
2 Definition... 3
3 Principle... 3
4 Apparatus... 3
5 Sampling... 5
6 Procedure... 5
7 Expression of results... 6
8 Test report... 7
Surface active agents - Powers and Granules - Measurement
of the angle of repose
This Standard is identical to the international standard ISO 4324-1977 Surface active
agents - Powders and granules - Measurement of the angle of repose.
Determining the angle of repose of powders and granules may give information on the
storage properties of the powder, especially in silos, etc.
1 Scope and field of application
This Standard specifies a conventional method for the determination of the angle of
repose of surface active agents in powder or granular form and of washing powders,
free from agglomerates.
This Standard is also applicable to other powders and granules with comparable
properties.
2 Definition
angle of repose. The base angle of the cone obtained by flow under the specified
conditions.
3 Principle
Determination of the angle of repose of the cone obtained by passing a given volume
of the product in the form of powder or granules through a special funnel placed at a
fixed height above a completely flat and level plate.
4 Apparatus
Only the dimensions given in the text are mandatory.
4.1 Measuring equipment, consisting of the following parts (see the figure).
4.1.4 Transparent plastic vessel, of minimum diameter 100 mm and minimum height
25 mm, placed 75 mm below the lower end of the funnel (4.1.1). Its internal surface
shall be slightly rough. It shall be positioned on the base-plate in such a way that the
center of the vessel and the axis of the funnel coincide, the centering being facilitated
by the graduation of the concentric circles on the base-plate.
4.1.5 Funnel support, fixed and positioned so that the axis of the funnel (4.1.1) is the
vertical line passing through the center of the concentric circles engraved on the base-
plate (4.1.3).
4.1.6 Supporting rod, comprising a scale graduated in millimeters from 0 to 100,
starting from the base-plate. A rod, integral with a horizontal slide moves on this scale,
allowing the height of the cone to be measured
The whole apparatus shall be protected against vibration.
4.2 Graduated measuring cylinder, of capacity 250 mL.
5 Sampling
The laboratory sample of surface active agent or washing powder shall be prepared
using a conical sample divider, to obtain a uniform mixed sample for determination.
6 Procedure
6.1 Preparation of sample and test portion
If the laboratory sample has formed agglomerates after a prolonged period of storage,
it may still be examined if it regains the fluid state after the vessel containing it has been
inverted.
Take 150 mL of the laboratory sample with the graduated measuring cylinder (4.2).
6.2 Determination
Carry out the measurements in the standard atmosphere. The recommended temperature
is 21 ~ 25 °C and the recommended relative humidity is 45% ~ 55%; alternatively, it is
most suitable for measurement in a standard atmosphere with a temperature of 25 ~
29 °C and a relative humidity of 60% ~ 70%.
Place the test portion in the funnel (4.1.1), having previously blocked the stern. Unblock
the stem and allow the powder to flow through, slowly agitating it using the agitator
(4.1.2).
Note. 1.The agitator is not always required, but to achieve the specified reproducibility
of the tests, the agitation process shall always be included.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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