ISO 15184 pdf free download
ISO 15184-2020 pdf free download.Paints and varnishes – Determination of film hardness by pencil test.
This document specifies a method for determining the film hardness by pushing pencils of known hardness over the film.
The test can be performed on a single coating of a paint, varnish or related product, or on the upper layer of a multi-coat system.
This rapid test has not been found to be useful in comparing the pencil hardness of different coatings. It is more useful in providing relative ratings for a series of coated panels exhibiting significant differences in pencil hardness.
The method is applicable only to smooth surfaces.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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, Points and varnishes — Examination and preparation of test samples
ISO 1514, Paints and varnishes — Standard panels for testing
ISO 2808, Paints and varnishes — Determination offilm thickness
ISO 4618, Paints and varnishes — Terms and definitions
ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.io.org/obp
— IEC Electropedia: available at http://www.electropediaorgJ
3.1 pencil hardness
resistance of the surface of a paint film to marking, or the formation of some other defect, as a result of the action of a pencil, with a lead of specified dimensions, shape and hardness, which is pushed across the surface
4 Principle
A pencil lead with a defined geometry is pushed over the paint surface at an angle of 450, exerting a force of (7,35 ± 0,15) N on the surface. The hardness of the pencil lead is increased in steps until the surface of the coating is marked by visible defects. The test result is the highest hardness at which no marking occurs.
5 Apparatus
5.1 Test instrument, consisting of a metal block fitted with two wheels, one on each side, as shown in Figure 1. The wheels shall be made in such a way that they do not scratch the paint surface during testing. In the middle of the metal block, there is a cylindrical hole, inclined at an angle of (45 ± 1)°, for the pencil.
With the help of a clamp, pencils can be fixed In the instrument so that they are always in the same position.
Mounted on the top of the instrument is a level which is used to ensure that the test is carried out with
the instrument horizontal.
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