ISO 11507  色漆和清漆 涂层暴露于人工风化暴露于荧光紫外灯和水

INTERNATIONAL STANDARD

Paints and varnishes --Exposure of coatings to artificial weathering--Exposure to fluorescent UV lamps and water
Peintures et vernis--Exposition des revetements au vieillissement artificiel--Exposition au raynonnement de lampes a fluorescence UV et a leau

Foreword

ISO （the international Organizat 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, governmental and non-governmental, in liaison with ISO,also take part in the work. ISO collaborates closely with the International Electrotechnical Commission （IEC） on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies or voting.Publication as an International Standard requires approval by at least 75% of the member bodies castion a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 11507 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.

This second edition cancels and replaces the first edition （ISO 11507:1997）, which has been technically revised.The main changes are:
--the data on the lamps （tables in 5.1.2） have been harmonized with the data given in ISO 4892-3;
--the purity of the water for wetting the test panels has been changed from grade 2 to grade 3
--conditioning of the coated test panels prior to testing has been deleted.

Introduction
Coatings from paints, varnishes and similar materials are weathered in the laboratory, in order to simulate ageing processes occurring during natural weathering. Generally, valid correlations between ageing during artificial and natural weathering cannot be expected because of the large number of influencing factors. Certain relationships can only be expected if the effect of the important parameters（spectral distribution of the irradiance in their photochemically relevant range, temperature of the specimen, type of wetting, wetting cycle relative humidity） on the coating is known. However, unlike natural weathering, testing in the laboratory is carried out taking into consideration a limited number of variables which can be controlled and therefore the results are more reproducible.