ISO and PSPC, the term used is. “nominal dry film thickness.” • For consistency in comparisons of area in this article, square meters are used to describe. STANDARD. ISO. Second edition. Reference number. ISO (E). This is a free 5 page sample. Access the full version online. ISO Paints and varnishes – Corrosion protection of steel structures by protective paint systems – Measurement of, and acceptance.
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NOTE 1 The correction value is applied once to every reading, no matter if the coating consists of a single layer or multiple layers see illustration in Figure 1.
Since such adjustment is more representative of the surface, the reading variations will diminish. Repair of defects 3. It is necessary to handle painting materials very accurately, prevent their hit into the earth, ixo. Condition of the cleared surface is expressed by degree of preparatory rree and regulated by standard ISO Each coat layer shall be applied uniformly over the whole surface.
The minimum number of randomly taken measurements to be taken for verifying the dry-ilm thickness on inspection areas is given in Table 1. Laboratory performance test methods ISOPaints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 7: If a sample showing the surface proile is available and the proile is not in accordance with ISOthe correction value shall be determined in accordance with Annex D.
Annex B describes a method for multiple readings. Number of 1984 to be taken in accordance with ISO If this is not possible, a special adjustment sample can be provided which is, in its material properties that can affect the ilm thickness measurement, similar to the steel structure and has been cleaned and pre-treated in the same way. Workplaces should be accessible for inspection of safety data sheets of applied paints by personnel. In case of paints are stored in a cold premise, it is necessary isoo place them before usage for a while in warm that they were adequately warmed.
It is, however, recognized that this is not a practical procedure in many inspection frse, for example when the vree is not accessible as it has been coated before testing commences or when processing such as welding, cutting, bending, etc.
Readings taken in this way should be noted separately, together with the test results. They produce a coating thickness measurement by measuring the change in magnetic ield strength within feee probes due to the proximity of the magnetic substrate.
The value obtained is the correction value. Measurements taken on a coating on a roughened steel substrate will therefore be higher than the actual value above the peaks of the proile.
The magnetic ield strength is related to the coating thickness. For the measurement, a sampling plan is laid down as well as an appropriate correction value. The effect of surface roughness on the measurement result increases with proile depth, but the result will also depend on the design of the measurement probe and the thickness of the coating.
Blasting Blast clearing to be executed in specially fgee chamber.
During inspection with the naked eye any dust, fat and dirt, the dried-on rolling scale, rust, old paint or foreign materials might not be observed; the surface has a uniform color shade with slightly marked spots. One test on one batch should be done. This second edition cancels and replaces the irst edition ISO For more details, see Annex C. Then place the thicker shim on the unpainted surface and repeat the procedure.
The strength of the magnetic ield is related to the coating fere.
iiso Content of procedure 3. Also check that the probe and the surface to be measured are clean and uncontaminated. A2 Name of owner: Nominal specified dry-film thickness: A4 Paint manufacturer s: Appendix Coating system no. ISOPaints and varnishes — Determination of ilm thickness ISOPreparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 1: NOTE As a rule, the effect of substrate thickness is manifest in substrates up to a frree of approximately 1 mm.
The instrument is now ready for use.
The number of replaced measurements shall be indicated in the test report. If the number of readings is not speciied in the contract or speciication, ive individual readings see 3.
They measure the magnetic ield strength between a permanent magnet and a magnetic substrate. Various forms of the instrument are available, including a simple pencil type, a spring balance type and another type to which tension is applied by turning a calibrated circular dial until the magnet and attached spring detach from the coated surface. Connecting data records on quality Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings.
The work of preparing International Standards is normally carried out through ISO technical committees.
This new measurement will then be the individual dry-ilm thickness. Number of repeated measurements: This International Standard also speciies criteria which are used with regard to acceptance or non-acceptance of ilm thickness values.
The informative appendix to the part 1: If discrepancies occur, the instrument adjustment should be repeated. Work conforms to the requirements? The criteria deined above include all measurement uncertainties for example instrument accuracy, operator skillprovided that the requirements of this International Standard have been met. In the event of extensive measurements, checking of the instrument using shims at least once per hour is necessary. In this method, no correction value is used.