ISO INTERNATIONAL STANDARD 6370-1 First edition 1991-12-01 Vitreous and porcelain enamels Determination of the resistance to abrasion- Part 1: Abrasion testing apparatus Emaux vitrifies-Determination de la résistance a I'abrasion- Partie 1: Appareillage d'essai d'abrasion Referencenumber ISO 6370-1:1991(E) ISO 6370-1:1991(E) Foreword Iso (the international Organization for Standardization) is a worldwide federation ofnational standards bodies (Iso memberbodies).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, inliaison with Iso,also takepart in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC)onallmattersofelectrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75%of the member bodies castingavote. International StandardIso6370-1was preparedbyTechnical Committee Iso/TC107,Metallic and other inorganic coatings,Sub-Committee SC 6, Vitreous andporcelain enamels. Iso 6370 consists of the following parts,under the general title Vitreous and porcelain enamels -Determination of the resistance to abrasion: Part1:Abrasiontestingapparatus Part2:Loss inmassaftersub-surfaceabrasion ISO1991 orbyany means,electronic or mechanical,including photocopying andmicrofilm,without permission in writing from the publisher. International Organization for Standardization CasePostale 56·CH-1211Geneve 20·Switzerland Printed in Switzerland ii ISO 6370-1:1991(E) INTERNATIONALSTANDARD Vitreous and porcelain enamels -- Determination of the resistance to abrasion Part 1: Abrasion testing apparatus The eccentric drive shall operate at a rotational fre- Scope quency of 300min "±3min and be provided with a device for checking this frequency. This part of IsO6370specifies the requirements for thetesting apparatus to be used for the determi- nation of the resistance to abrasion of vitreous and 3.2 Retaining rings porcelainenamelcoatings. At least six retaining rings as shown in figure2 are required for the testing apparatus. The retaining ring shall be constructed of steel, cast iron or light metal 2 General description lined with rubber. The opening is used for introduc- ing the abrading charge and shall be able to be The abrasion testing apparatus is composed essen- closed by a rubber stopper. tially of the parts described in 3.1 to 3.4. Figure1 shows the arrangement of the specimens 3.3 Sealing rings and reference glass plates in the apparatus. At least six sealingrings of87mm±0,5mm internal diameter, 10mm±2mmbreadthand 2 mm±0,5 mm thickness, consisting of a non-rigid 3 Requirements elastic material (e.g. rubber), are required on the testing apparatus. 3.1 Oscillating table with drive 3.4 Clamping devices Anoscillatingtableof about 10mm inthickness, made of steel or light metal, is placed horizontally The clamping device shall press the lower edge of on an eccentric drive in such a way that during the the retaining ring (3.2) against the sealing ring (3.3) test every point of the oscillating table describes a which retains the specimen or the reference glass horizontal circleof22mm±1mm indiameter.The plate on the oscillating table (see 3.1). It shall be oscillating table shalf be large enough fortesting at possible to loosen the clamping devices quickly for leastthreespecimens and clampingthreereference easy exchange of specimens and reference glass plates on it by means of the retaining rings (3.2). plates. 1