EN 27491:1991

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Dentistry - Dental materials - Determination of colour stability of dental polymeric materials (ISO 7491:1985)Zahnheilkunde - Zahnärztliche Werkstoffe - Bestimmung der Farbbeständigkeit bei zahnärztlichen Kunststoffen (ISO 7491:1985)Art dentaire - Produits dentaires - Détermination de la stabilité de couleur des produits dentaires a base de polymeres (ISO 7491:1985)Dentistry - Dental materials - Determination of colour stability of dental polymeric materials (ISO 7491:1985)11.060.10Dental materialsICS:Ta slovenski standard je istoveten z:EN 27491:1991SIST EN 27491:2000en01-januar-2000SIST EN 27491:2000SLOVENSKI
STANDARD
International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON~MEX~YHAPOLIHAR OPrAHM3AUMR l-lo CTAHCLAPTbl3Al&Wl@ORGANlSATlON INTERNATIONALE DE NORMALISATION Dental materials - Determination of colour stability of dental polymeric materials Produits dentaires - &termination de la stabilitt5 de couleur des produits dentaires ;i base de polym&res First edition - 1985-08-15 UDC 615.462: 616.314: 620.193 Descriptors : dentistry, dental materials, resins, tests, determination, stability, colour. Ref. No. IS0 7491-1985 (E) Price based on 2 pages SIST EN 27491:2000

Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 7491 was prepared by Technical Committee ISO/TC 106, Dentistry. 0 International Organization for Standardization, 1985 Printed in Switzerland SIST EN 27491:2000

INTERNATIONAL STANDARD IS0 74914985 (E) Dental materials - Determination of colour stability of dental polymeric materials ._ -. 0 Introduction Colour stability is an important characteristic of dental polymeric materials and it is expected that the test methods in this International Standard will be referred to in the Inter- national Standards specifying those materials. 1 Scope and field of application This International Standard specifies a method for the deter- mination of the colour stability of dental polymeric materials. 2 References IS0 4892, Plastics - Methods of exposure to I’aboratory light sources. CIE Publication 15, Calorimetry. 3 Method of test 3.1 Apparatus 3.1 .l Radiation source Xenon lamp with a colour temperature of 5 000 to 7 000 K and with an illuminance at the specimen of 150 000 lux. Any devia- tion of the illuminance from the mean value at any given mo- ment shall not exceed & 10 % over
...