Some are dedicated to characterise coatings and others are more suitable for testing bulk materials such as metals plastics rubber or elastomers. Predicted scratch adhesion values from such models differ widely from the actual scratch test results.
Under a high resolution microscope the examiner determines at which force the first cracks formed or when the coating chipped off.
Paint scratch test tool. Maintaining high quality coatings paint and films is an important requirement within the semiconductor industry. The tool is held horizontally and pulled across the sample to produce the scratch. A test panel is clamped to a slide which slowly withdraws the panel while a needle scratches the surface.
Using a scratch test tool i do a crosshatch pattern and then place masking tape over the to. To assess a coating s resistance to scratch there are a number of different instruments that can be used. The scratch test is a comparative procedure that relies on reference measurements.
Using the same principles as the elcometer 3000 manual clemen unit the motor brings the tool gently in contact with the sample whatever the load variable from 0 to 5000g 176 4oz moves across the coating and then gently lifts it with the automatic start stop function. Specifications allow for use of either the preferred mechanised or hand operated apparatus. The xyztec scratch test pdf provides a new means of measuring the quality of the adhesive bond of single or multiple coatings to the substrate and or each other.
Scratch test coating test. As shown in the video a special shear tool is used to land on to a coating or. The p a t paint adhesion test kit produced by gardco contains all of the tools and materials needed for conducting adhesion tests on paints applied to a flat uniform surface in accordance with astm test method d3359 with new version of permacel 99.
Cutting tool especially designed for cutting panels or specimens with coatings or test panels for salt fog corrosion tests as described in the standards iso 12944 6 2018 iso 17872 iso 9227. Tests are conducted either on a go no go basis using a single specified load or by increasing the load to determine the minimum load at which the coating is penetrated. In this video i take you through the process of a scratch test.
Initial evaluations are always performed visually. The elcometer 1537 iso scratching tool is a simple but effective instrument which is used to scratch the surface of samples in preparation for adhesion salt spray and corrosion tests. Pencil hardness tester wolff wilborn sclerometer clemen apparatus.
Sikkens nk3000 scratch tool. Evaluation and fine tuning of such scratch models certainly requires continuous developmental effort with an objective to obtain a standard model that would give comprehensive description of any scratching process.