This part of ISO 8130 specifies a method for
determining the flow properties of a mixture of
coating powder and air. The method reflects
commercial practice in powder spraying
(see “Bibliography”, Annex B).
The results obtained are influenced by the
composition of the coating powder, its density,
particle size distribution and particle shape,
together with the tendency of the particles to
agglomerate and to accept a triboelectric charge.
NOTE 1 It is well known that the transport and spraying
characteristics of powders are highly dependent on their flow
properties in bulk and in air. The procedure described in this
method is considered to be more meaningful than the “flow angle”
approach sometimes used to evaluate bulk flow properties. In the
latter, the angle of the cone formed when a powder is allowed to
flow through a vertical funnel on to a horizontal surface is
measured. A given mass of powder with good flow properties
forms a shallower cone than an equal mass of a powder with
poorer flow. The objections to the flow angle method are that it is
difficult to obtain a precise measurement and that the powder is
used alone, whereas during application it is mixed with air.
BS EN ISO 8130-5:2010 history
2021BS EN ISO 8130-5:2021 Coating powders. Determination of flow properties of a powder/air mixture
1993BS EN ISO 8130-5:2010 Coating powders. Determination of flow properties of a powder/air mixture