BS EN ISO 2808 pdf download

BS EN ISO 2808-2019 pdf download.Paints and varnishes — Determination of film thickness.
This International Standard reviews and specifies a number of methods that are applicable to the measurement of the thickness of organic coatings applied to a substrate. It does not apply to metallic coatings. Some of the techniques described can be adapted for the measurement of the thickness of detached coatings. The principles of the methods, their particular field of application and the expected precision are given in Table 1.
This International Standard also defines terms concerning the determination of film thickness.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of
IEC and ISO maintain registers of currently valid International Standards.
ISO 1463:1982, Metallic and oxide coatings — Measurement of coating thickness — Microscopical method.
ISO 1514:1993, Paints and varnishes — Standard panels for testing.
ISO 2178:1982, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic method.
ISO 2360:1982, Non-conductive coatings on non-magnetic basis metals — Measurement of coating thickness — Eddy current method.
ISO 2811:1997, Paints and varnishes — Determination of density — Part 1: Pyknometer method — Part 2:
Immersed body (plummet) method — Part 3: Oscillation method — Part 4: Pressure cup method.
ISO 3233:1984, Paints and varnishes — Determination of volume of dry coating (non-volatile matters) obtained from a given volume of liquid coating 1) .
ISO 3497:1990, Metallic coatings — Measurement of coating thickness — X-ray spectrometric methods.
ISO 3543:1981, Metallic and non-metallic coatings — Measurement of thickness — Beta backscatter method.
ISO 4518:1980, Metallic coatings — Measurement of coating thickness — Profilometric method.
ISO 7254:1984, Paints and varnishes — Assessment of natural spreading rate — Brush application.
ISO 8503-1:1988, Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive blast-cleaned surfaces.
3 Required supplementary information
The methods of measurement specified require to be completed, for any particular application, by the following supplementary information.
This information should be derived from the International Standard or national standard or other document for the product under test or, if appropriate, may be the subject of agreement between the interested parties.
a) The method of application of the coating to the substrate and whether it is a single coating or a multi-coat system.
b) The duration and conditions of drying (or stoving) and ageing (if applicable) of the coming before measurement.
c) The method of film thickness measurement to be used (see Table 1).
d) The significant area (see 4.2) of the coated article and, if necessary, the number of measurements.
4 Definitions For the purpose of this International Standard, the following definitions apply: 4.1 film thickness the thickness of a coating applied to a substrate is the distance between the surface of the film and the surface of the substrate NOTE 1 The value of a film thickness depends, to some extent, on the method of measurement used. To give a correct value would only be possible if the coating and substrate had flat and even surfaces. In practice, neither the surface of the coating nor the surface of the substrates is even. In many cases, the surface irregularities exceed 10 % of the film thickness. The results of the measurements by different methods are influenced by these irregularities. The influence is different for each method. Therefore, the results of different methods applied to the same specimen may differ markedly. This is the reason why the results of film thickness measurements always have to be reported together with information on the method of measurement and which type of instrument was used, plus the bias of the instrument, if known.BS EN ISO 2808 pdf download.