Paints and varnishes

BS EN ISO 2815:2003 pdf free.Paints and varnishes一Buchholz indentation test.
The following referenced documents are indispensable for 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 samples for testing
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
An indentor of specified size and shape is applied to the coating under defined conditions. The indentation length is measured in millimetres (see Annex A).
4 Apparatus
4.1 Indentation apparatus
This is shown in Figure 1. It consists essentially of a rectangular block of met&, which forms the body of the instrument, an indentor and two pointed feet.
The indentor is a sharpened sharp-edged metal wheel of hardened tool steel. The cross-section through its axis of rotation and its dimensions shall be as shown in Figure 2. Figures 3a) and 3b) show the shape of the indentation produced.
The indentor and the two feet are so positioned in the body that, when the instrument is placed on a level surface, it is stable, its upper surface is horizontal and the effective load upon the indentor is (500 ± 5) g.
4.2 Measuring device
A suitable device for measuring the length of the indentation consists of a microscope with x 20 magnification and an eyepiece fitted with a graduated scale capable of reading to 0,1 mm. The area of indentation shall be illuminated by means of a light source located so that the angle of incidence of the light exceeds 600, as shown in Figure 4. The microscope shall be positioned vertically over the illuminated area and focused to bring the shadow produced by the indentation (see Figures 4 and 5) and the graduated scale together.
NOTE The position of the indentation mark can be located by means of a suitable template prepared from a triangular sheet of transparent plastics film (see Figure 6).
4.3 Timing device Use a stopwatch or other suitable timing device capable of measuring 30 s to the nearest Is.
5 Sampling
Take a representative sample of the product to be tested (or of each product in the case of a multicoat system), as described in ISO 15528. The sample shall then be examined and prepared for testing as described in ISO 1513.
6 Test panels
6.1 Materials and dimensions
Unless otherwise agreed. the test panels shall be of metal or glass conforming to the requirements of ISO 1514.
The test panels shall be flat and free from distortion, and the surface shall be free from any visible ridges or cracks.
Unless otherwise agreed, the test panels shall have minimum dimensions of 150 mm x 100 mm and a thickness of not less than 0,75 mm.
NOTE The test panels may be cut to size after coating and drying, provided no distortion occurs.
6.2 Preparation and coating of panels
The test panels shall be prepared in accordance with ISO 1514, unless otherwise agreed, and shall then be coated by the specified method with the product or system under test to the specified film thickness limits. Any variation from the requirements of ISO 1514 shall be noted in the test report (see Clause 10).
6.3 Drying and conditioning of the test panels
The coated test panels shall be dried (or stoved) and aged (if applicable) for the specified time and under the specified conditions and, unless otherwise specified, shall be conditioned at a temperature of (23 ± 2) °C and a relative humidity of (50 ± 5) % for a minimum of 16 h. The test procedure shall then be carried out as soon as possible.
6.4 Thickness of coating
The average thickness, in micrometres. of the dry coating in the region to be tested shall be determined by the method specified, using one of the procedures specified in ISO 2808.
7 Procedure
7.1 Ambient conditions
The test shall be carried out at a temperature of (23 ± 2) °C and a relative humidity of (50 ± 5) %, unless otherwise agreed.
7.2 Determination of indentation length
Place the test panel, paint film uppermost, on a firm horizontal surface.
Take the indentation apparatus (4.1) and place it gently and without any tilting or lateral movement on the test panel, leave the indentor in position for (30 ± 1) s and remove it carefully.
When the apparatus is put in place, the feet of the apparatus shall first be allowed to make contact with the test panel and then the indentor lowered carefully until it touches the panel, When the apparatus is removed, it shall be lifted off indentor first and feet last.
Place the light source and microscope in position as specified in 4.2 and measure the length, in millimetres. of the shadow produced by the indentation (35 ± 5) s after removal of the indentor, unless otherwise specified. Record the result in millimetres, to the nearest 0,1 mm, as the indentation length.
Carry out five tests on different parts of the same test panel and calculate the mean value.
Table 1 shows the relationship between the indentation length, in millimetres, the indentation depth, in micrometres, and the minimum coating thickness, also in micrometres, for which the measurement is valid. Discard any results which fall outside these limits.
The test report shall include the following information:
a) a reference to this International Standard (ISO 2815:2003);
b) all details necessary to identify the product tested;
C) the result, expressed in accordance with Clause 8;
d) any deviation from the test method specified;
e) the date of the test.
The test report shall also contain the following supplementary information, which shall be derived from a national standard or other document for the product under test or, where appropriate, shall be the subject of agreement between the interested parties:
f) the substrate material and details of its surface preparation;
g) the method of application of the test coating to the substrate;
h) the thickness, in micrometres, of the dry coating, the method of measurement used, and whether the coating is a single coating or a multicoat system;
i) the duration and conditions of drying (or stoving) and ageing (if applicable) of the coated panel before testing;
j) the recovery time before measuring the indentation, if other than (35 ± 5) s.BS EN ISO 2815 pdf free download.Paints and varnishes