DIN Standards Committee Coatings and Coating Materials
DIN EN ISO 8130-5
Coating powders - Part 5: Determination of flow properties of a powder/air mixture (ISO 8130-5:1992); German version EN ISO 8130-5:2010
Pulverlacke - Teil 5: Bestimmung der Fließeigenschaften eines Pulver-Luft-Gemisches (ISO 8130-5:1992); Deutsche Fassung EN ISO 8130-5:2010
Overview
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. 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. 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 certain mass of powder with good flow properties forms 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. The Committee responsible for this standard is NA 002-00-07 AA "Allgemeine Prüfverfahren für Beschichtungsstoffe und Beschichtungen" ("General test methods for coating materials and coatings") at DIN.
Document: references other documents
Responsible national committee
NA 002-00-07 AA - General test methods for coating materials and coatings
Responsible european committee
CEN/TC 139 - Paints and varnishes
Responsible international committee
ISO/TC 35/SC 9 - General test methods for paints and varnishes
