Paints and Varnishes
Measurements
Salt spray test
Chip resistance test
Humditiy test
Pencil hardness
Cross cut
Impact resistance
Measurement of color
Evaluation of coating damages
Pull off test
Resistance test
Light resistance
Elongation
Scratch resistance
Pendel hardness
Dry film thickness
Cupping test
Peel test
Gloss grade
Pencil hardness DIN EN ISO 15184
A pencil of fixed geometry is slid over the surface of the coating at an angle of 45 and under a load of 7.5 N. The hardness of the pencil lead is gradually increased until the coating surface has visible damage. The test result is the highest hardness at which no damage occurs.
Pencil set made of wood with the following hardnesses:
9B - 8B - 7B - 6B - 5B - 4B - 3B - 2B - B - HB - F - H - 2H - 3H - 4H - 5H - 6H - 7H - 8H - 9H
soft ................................................. .................................................. severe
B - black .......... HB - half black ............ F - tight ............ H - hard
Cross cut DIN ISO 2409
The cross cut test is an examination of the adhesion of a dry coating to the substrate. Using a cutting block with 6 or 11 cutting edges, two series of lines are engraved at right angles to each other, creating a pattern of 25/100 squares. The scribed area is evaluated using a comparison table.
Impact resistance DIN ISO 6272
The impact resistance test is used to test the penetration resistance and flexibility of coatings during rapid deformation.
- according to DIN / ISO 6272-2 and ASTM D2794 (indirect impact resistance)
- according to ISO 6272-1 (direct impact resistance)
Measurement of color EN ISO 11664-4
The L * a * b * color space (also: Lab colors, CIELAB, CIEL * a * b *) describes all perceptible colors.
Color measurements; SCI = measurement with gloss; SCE = measurement without gloss
Metamerism index: deviation of the same colors under different lighting
E: Color difference (0.0 ... 0.5: almost unnoticeable / 0.5 ... 1.0: noticeable to the experienced eye)
Light resistance DIN EN ISO 4892
Xenon arc lamps DIN EN ISO 4892-2
A filtered xenon arc lamp is used to simulate the relative spectral irradiance of global radiation in the ultraviolet (UV) and visible wavelength regions of the spectrum.
The specimens are exposed under controlled environmental conditions to different levels of radiation, heat, relative humidity and water.
Elongation ISO 6860
The elongation test is used to test paint layers to what extent they can be deformed (one-dimensionally) before cracking occurs.
Elongation Tester is designed to assess the resiliency or resistance of a coating (eg paint or varnish) to cracking, stretching and / or delamination in accordance with ISO 6860 and ASTM D522.
With this test, it is possible to deform a painted test panel by 180 in a single test over a mandrel with a diameter of 38mm to 3.1mm. Starting with the largest to the smallest diameter is now checked visually, at which diameter the first cracks occur. The smaller the diameter, the higher the deformability of the coating.
Scratch resistance DIN EN ISO 1518
Method with constant load DIN EN ISO 1518-1
A scribing stylus loaded with a specified test force is pulled over a coating at a constant speed. The Ritz will be examined to determine if the coating has been scribed to the specified depth by the specified test load ("yes / no" test), or the minimum required load under which the scribe passes through the coating to the substrate.
Process with continuously increasing load DIN EN ISO 1518-2
The coating material to be tested or the coating system to be tested is applied in a uniform layer thickness to flat sample plates having a uniform surface finish. After drying / curing, scratch resistance is determined with an automatic tester which pushes the sample plates under a pointed stylus. The stylus is mounted so that it presses perpendicular to the surface of the sample plate. The load on the sample plate is steadily increased until the surface is scratched.
Pendel hardness test
The test is for the determination of the hardness according to the method of König and / or Persoz analogous to DIN EN ISO 1522. Both methods work on the principle that the damping time of a pendulum oscillating on a sample indicates their hardness.
DIN EN ISO 2360, 2170 and DIN EN ISO 2808
Non-conductive coatings on non-magnetic metallic base materials
Measuring the layer thickness with eddy current method (ISO 2360)
An eddy current probe (or gauge with integrated probe) is placed on the surface of the coating (s) to be measured, the thickness of which is read from the instrument display.
Measuring the layer thickness
Magnetic process (IS0 2178-DIN EN ISO 2808)
Magnetic film thickness measurement devices are based either on the magnetic attraction between a permanent magnet and the parent metal, which is affected by the presence of the coating, or on the change in magnetic flux through the coating and base metal.
Cupping test ISO 1520
This test is intended to define the resistance of paints, lacquers or bonded products to cracks and / or peels from a metal substrate in gradual deformation by deepening under standard conditions. This test is performed either as an "OK / Fail" test by testing to a specified depth or defining a minimum depth at which a coating precipitates by gradually increasing the depth. The ISO 1520 standard requires that sheets be slowly deformed at a uniform rate between 0.1 mm / s and 0.3 mm / s without interruption. Especially with thicker steel sheets hand-operated test equipment does not always allow an uninterrupted deformation.
Gloss grade DIN EN ISO 2813
Determination of the gloss value below 20 , 60 and 85
With a reflectometric measuring device, gloss values are determined on coated surfaces, which correlate with the visual gloss impression. The ratio of the degree of gloss of the coating to the gloss level of a polished plano-glass plate with a defined reference refractive index is determined.
