Overview
HuiNuo QTX paint film resilience tester is a special testing instrument designed and manufactured according to the national standard GB1731-79 to measure the flexibility (resilience) of paint film. The instrument evaluates the cracking and flaking performance of paint film by bending metal samples coated with paint film on shafts of different diameters.
Features
1. Designed according to the national standard GB1731-79, the test results are authoritative and reliable.
2. Integrate seven steel shaft rods of different specifications into one, covering a wide range of tests.
3. Compact structure design, can be fixed on the side of the test bench, stable and convenient operation.
4. The shaft rod specification is clear, covering round and rectangular sections, with a radius of curvature from 0.5 mm to 7.5 mm, to meet the measurement requirements of different flexibility levels.
Principle
The Working Principle of this tester is based on the deformation ability of the paint film. Apply the prepared and drying paint film sample (paint face up) to the shaft rods of different diameters and bend 180 degrees in 2-3 seconds. Its flexibility is judged by observing whether the paint film is crazing or flaking after bending. The minimum diameter shaft rod that the paint film can pass through without damage is the flexibility index of the paint film.
Applications
Coating film flexibility measurement, paints product mass testing, coating development and performance evaluation
Steps
1. Prepare an iron plate with a thickness of 0.2-0 mm and a size of 20 * 100-150 mm, sanding it with No. 0 abrasive paper or sandpaper and wiping it with pine perfume (if the product standard allows, only wipe it).
2. According to the standard or prescribed method, the preparation of the paint film sample on the iron plate and drying it to the specified time.
3. Press the sample paint film up against the shaft rod 1 with a diameter of 15 mm, and bend 180 degrees (90 degrees left and right) within 2-3 seconds.
4. Use 4 times magnifying glass to observe the curved paint film. If there is no crazing and flaking, then bend and observe the repeability on the smaller diameter shaft rod (10, 5, 4 mm, etc.).
5. Record the minimum diameter shaft rod size passed by the paint film without crazing and flaking, which is the flexibility index of the paint film.
6. It can also be bent directly on the shaft rod specified in the product standard to determine whether it is qualified.
Notice
* Determination should be carried out at a temperature of 22 +/- 1 ° C and a relative humidity of not more than 70%.
The bending operation of the shaft rod should be smooth, and the bending time should be controlled within 2-3 seconds.
* Each observation must be carefully checked with 4x magnifying glass for crazing or flaking of the paint film.
The test sequence should be carried out from large diameter shaft to small diameter shaft.
The preparation and processing of the sample shall be carried out in strict accordance with the relevant standards or regulations to ensure the accuracy of the test results.
