During the test ASTM D4707ĭuring the test, the degree of dots and blots remaining on the sheet is assessed according to the patterns given in the standard. The method provides reproducible results as opposed to subjective evaluation using conventional rollers with different plating lengths used for painting. In order to assess the degree of paint splash, the laboratory method ASTM D4707 is used, which is based on the use of a special notch spool roller. The poor flow of the paint will reduce the gloss and the aesthetic value of the coating. Standardized and reproducible brush mark evaluation tests are essential in the paint test stage for the selection of rheological additives. The ASTM D4958 method is used to evaluate the brush drag marks. It is a mandatory procedure for preparing brushes and rollers before each use of this type of coating tool in the laboratory. Therefore, the developed ASTM test methods allow the preparation of brushes and rollers for paint application in a repeatable manner.ĪSTM D5068 and ASTM D5069 include procedures for the standardized saturation of brushes and rollers to a level where each successive wetting of the roller does not result in enhanced paint absorption. It is difficult to assess the quality of painting with a brush and roller in laboratory conditions due to many factors affecting the repeatability of the test. The viscometer measures the consistency in KU (Krebs Units) at 200 revolutions per minute.ĭeterminaion of Anti-Sag Index ASTM D4400 In the Spektrochem laboratory, we use the Stormer digital viscometer (ASTM D562 method B). One of the basic rheological evaluations is the measurement of low-shear viscosity consistency according to ASTM D562.
Proper application of the paint on the wall or ceiling guarantees not only its aesthetic appearance, but also ensuring the formation of a coating with appropriate properties.
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