ISO 1518-1-2011 pdf download.Paints and varnishes – Determination of scratch resistance 一 Part 1: Constant-loading method.
This part of ISO 1518 specifies a test method for determining under defined conditions the resistance of a
single coating o a multi-coat system of paint, varnish or related product to penetration by scratching with a
scratch stylus loaded with a specified load. Penetration of the stylus is to the substrate, except in the case of a
multi-coat system, in which case the stylus can penetrate either to the substrate or to an intermediate coat.
The method specified can be carried out
a) either as a pass/fail” test, by testing with a single specified load applied to the stylus to assess compliance with a particular specification;
b) or by applying increasing loads to the stylus to determine the minimum load at which the coating is penetrated.
2 Normative references
The following referenced documents are indispensable foi the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1513, Paints and varnishes — Examination and preparation of test samples
ISO 1514, Paints and varnishes — Standard panels for testing
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
3 Principle
A scratch stylus loaded with a specified load is drawn over a coating at a constant speed. The following test parameters are specified:
— the geometry of the stylus tip:
— the range within which the test load may lie and the increments by which it may be increased;
— the procedure by which the stylus is lowered on to the coating;
— the speed at which the stylus travels and the minimum length of the scratch.
The scratch is examined to see if the coating has been penetrated to the extent specified for a single specified test load (“pass/fail” test) or to determine the minimum test load required for penetration,
4 Apparatus
4.1 Scratch apparatus, two versions of which are illustrated in Figure 1 and Figure 2. with the following characteristics:
— The test load acting on the scratch stylus fixed to the load beam can be produced either by a weight attached to the stylus (see Figure 1) or by a weight which slides along a graduated load beam (see Figure 2).
— The test load shall be 1 N to 20 N, shall be adjustable in increments of 0,5 N and shall be accurate to within 0,2 N.
— The test panel held in a panel holder is moved relative to the stylus by means of a linear actuator driven by a motor. The speed at which the stylus travels shall be (35 ± 5) mm/s and the length of the scratch shall be at least 40 mm. The length of the scratch can affect the result.
— A lowering device with a flat ramp brings the stylus smoothly into contact with the coating at the beginning of the movement of the panel holder. The angle of the ramp shall be (12.5 ± 2,5)°.
Some types of apparatus are designed so that the load beam moves and the test panel is fixed. Such types of apparatus may also be used.
4.2 Scratch stylus A. having a hemispherical hard-metal tip of radius (0,50 ± 0,01) mm.
4.3 Scratch stylus B, having a hemispherical hard-metal tip of radius (0,25 ± 0.01) mm.
4.4 Scratch stylus C, having a hemispherical synthetic-ruby tip of radius (0,50 ± 0,01) mm.
4.5 Scratch stylus D, having a hemispherical synthetic-ruby tip of radius (0,25 ± 0,01) mm.
4.6 Indicating device, based on electrical contact between the stylus and the metallic substrate, to show when the coating has been penetrated.
NOTE 1 This device is not suitable (or paints containing electrically conducting pigments, for non-metallic substrates or if penetration to an intermediate non-conducting coat is required.
NOTE 2 The indicating device can only be used when certain parts of the scratch apparatus are electrically insulated.
4.7 Magnifying lens, with at least x4 magnification.ISO 1518-1 pdf download.
Tags: Paints and varnishes
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