ISO INTERNATIONAL STANDARD 8780-3 First edition 1990-11-15 ANSl Internat Doc Sec Pigments and extenders -- Methods of dispersion for assessment of dispersion characteristics Part 3: Dispersion using a high-speed impeller mill Pigments et matieres de charge --- Methodes de dispersion pour évaluer ladispersibilité Partie 3: Dispersion a I'aide d'une turbine disperseuse a grande vitesse Referencenumber ISO8780-3:1990(E) Provided by IHS under license with ISC No reproduction or networking permitted without ISO8780-3:1990(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through iso technical committees. Each member body interested in a subject for which a technical. committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with iso, also take part in the work. Iso collaborates closely with the International Electrotechnical Commission(iEC)onallmattersofelectrotechnicaistandardization Draftinternational Standards adoptedbythetechnical committees are circulated to the member bodies for voting. Publication as an Inter- bodies casting a vote. International Standard IsO 8780-3 was prepared by Technical Committee ISO/TC 35, Paints and varnishes. Iso 8780 consists of the following parts, under the general title Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics: --- Part 1: Introduction -- Part 2: Dispersion using an oscillatory shaking machine - Part 3: Dispersion using a high-speed impeller mill -Part 4:Dispersionusing abeadmill -- Part 5: Dispersion using an automatic muller Part 6: Dispersion using a triple-roll mill Annex A forms an integral part of this part of iso 8780. CISO1990 or by any means,electronic or mechanical, including photocopying and microfilm,without permission inwriting fromthepublisher. Internationat Organizationfor Standardization CasePostale56.CH-1211Geneve20·Switzerland Printed in Switzerland Copyright Int or Standardizatior No reproduction or networking permitted without license from IHS Not for Resale ISO8780-3:1990(E) INTERNATIONAL STANDARD Pigments and extenders -- Methods of dispersion for assessment of dispersion characteristics Part 3: Dispersion using a high-speed impeller mill Scope of dispersion for assessment of dispersion charac- 1 teristics --- Part 1: Introduction. This part of IsO 8780 specifies a method for the dis- persion of pigments and extenders using a high- IsO 8781-1:1990,Pigmentsandextenders -Methods speed impeller mill. It is for use in conjunction with of assessment of dispersion characteristics Part 1: Assessment from the change in tinting themethodsofassessmentdescribedinIsO8781. using an agreed binder system. it should be read in strength of coloured pigments. conjunction with iso 8780-1. iso 8781-2:1990,Pigments and extenders---Methods NOTE1 Ahigh-speedimpellermillmaybeused either ofassessment 'of dispersion characteristics to disperse a pigment fully or partially as a preliminary to Part 2: Assessment from the change in fineness of further dispersion using other equipment, for example grind. sand or beadmills or attritors. iso 8781-3:1990,Pigments and extenders --- Methods This method is restricted to mill bases of moderately of assessment of dispersioncharacteristics high viscosity due to either high binder concen- Part 3: Assessment from the change in gloss. tration and/or high pigment concentration which produces high shear forces. It is not intended to provide a means of formulating full-scale mill base 3 Required supplementary information compositions (scaling up the process from labora- For any particular application, the test method tory equipment to factory mills is not simple). specified in this part of iso 8780 needs to be com pleted by supplementary information. The it