Overview
JFL QHQ-A (750g) Pencil hardness tester is a test instrument for measuring paint film Hardness designed and manufactured in strict accordance with GB/T5739-1996. It adopts mechanical structure design. It contacts the tested surface through two rounds and three points of the refill. The refill and the test film surface maintain a 45-degree angle. Hardness value of the paint film is determined by pushing the hardness tester.
Features
1. Designed and manufactured in strict accordance with GB/T5739-1996 standards
2. Adopt mechanical structure design, through two wheels and refill three point contact
3. Maintain a 45-degree angle between the refill and the surface of the test film
4. Equipped with 750g weight
5. 13 Chinese pencils as standard
Principle
The pencil hardness tester by two rounds and three points in contact with the test surface of the refill, the refill is maintained at an angle of 45 degrees with the test film surface, the hardness tester is pushed forward under a load of 750g, and the hardness tester is measured by scratching the pencil on the film. Hardness value of the paint film.
Applications
Film hardness testing
Standards
GB/T5739-1996、GB/T6739
Steps
1. Put the pencil hardness tester on the flat countertop and the pad on the lower part of the hardness tester
2. Insert the sharpened pencil into the main hole, the edge of the pencil contacts the workbench, and tighten the screws
3. Place the hardness tester on the test board and advance at a speed of about 1mm per second
4. Starting from the hardest pencil, each level of pencil plows five 3mm long marks to find the pencil Hardness that does not plow the film
Notice
• Smooth tinplate is required for test samples, with specifications of 120 * 50 * (0.2-0) mm or Miscellaneous
• The pencil lead needs to be sharpened to expose the cylindrical lead lead 5-6mm, and the lead should not be loosened or cut.
• The end face of the refill should be rubbed on the sandpaper until the end face is flat and the edge is sharp, and the edge must not be crushed or notched.
• The pencil should be swirled/spun 180 ° after each use before use, or reground before use
• This pencil hardness tester corresponds to a single weight. If you need three weights, please contact customer service.
