ISO 4324:1977 pdf download.Surface active agents — Powders and granules — Measurement of the angle of repose.
INTRODUCTION
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 International 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 method is also applicable to other powders and granules with comparable properties.
2 REFERENCES
ISO 554, Standard atmospheres for conditioning and/or testing — Specifications.
ISO 607, Surface active agents — Detergents — Methods of sample division.
4 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.
5 APPARATUS
Only the dimensions given in the text are mandatory.
5.1 Measuring equipment0 consistin9 of the following parts (see the figure)
5.1.1 Glass funnel, having an internal stem diameter of
10 mm.
5,1.2 Agitator, comprising two rods placed opposite one another along the whole length of the interior wall of the funnel (5.1 .1), and extending into the stem; these rods should be capable of being turned easily by means of a handle.
5.1.3 Base-plate, of minimum length 220 mm and minimum width 158 mm. The base-plate shall be completely rigid and shall have a polished surface or be engraved with concentric circles of diameters of from 10 to 100 mm, the centres of which shall be coaxial with the axis of the funnel.
5.1.4 Transparent plastic vessel, of minimum diameter
100 mm and minimum height 25 mm, placed 75mm below the lower end of the funnel (5.1.1). Its internal surface shall be slightly rough. It shall be positioned on the base- plate (5.1 .3) in such a way that the centre of the vessel and the axis of the funnel coincide, the centring being facilitated by the graduation of the concentric circles on the base-plate.
5.1.5 Funnel support, fixed and positioned so that the axis of the funnel (5.1.1) s the vertical line passing through the centre of the concentric circles engraved on the base- plate (5.1.3).
5.1.6 Supportrng rod, comprising a scale graduated in millimetres from 0 to 100, starting from the base-plate (5.1.3). A rod integral with a horizontal slide moves on this scale, allowin9 the height of the cone to be measured.
The whole apparatus shall be protected against vibration.
5.2 Graduated measuring cylinder, of capacity 250 ml, complying with the requirements of Iso 4788.ISO 4324:1977 pdf download.