Overview
JFL QHQ-A Pencil hardness tester is a test instrument designed and manufactured in strict accordance with GB/T5739-1996 for measuring the Hardness of paint films. According to different test requirements, three Nominal Mass specifications of 500g, 750g and 1000g are provided. The instrument adopts a mechanical structure design. It contacts the tested surface through two rounds and three points of the refill. The refill maintains a 45-degree angle with the test film surface. The 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. Provide 500g, 750g, 1000g three Nominal Mass specifications
3. Adopt mechanical structure design, easy to operate
4. 13 Chinese pencils as standard
5. Ensure Test Stability with two rounds and three points of refill
Principle
JFL QHQ-A Pencil hardness tester touches the tested surface through two rounds and three points of the refill, and the refill remains at a 45-degree angle to the test film surface. Push the hardness tester during the test, and measure the Hardness value of the paint film by scratching the pencil on the film surface. Start testing step by step from the hardest pencil until finding the pencil Hardness level that does not plow the film.
Applications
Film hardness testing, coating performance testing
Steps
1. Place the pencil hardness tester on a flat countertop and place the pad on the lower part of the hardness tester
2. Insert the pencil sharpened as required into the main hole, contact the edge of the pencil with the worktable, and tighten the screws
3. Place the tester on the board to be tested and advance at a speed of about 1mm per second
4. Start with the hardest pencil and plow five 3mm long marks per pencil until you find the pencil Hardness level that does not plow the film
Notice
• This pencil hardness tester corresponds to a single weight. If you need three weights, please contact customer service.
• The test sample should use a smooth tinplate with a specification 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 to be flat and sharp, and the edge should not be crushed or notched.
• The pencil should be swirled/spun 180 ° after each use before use, or reground before use
• Propulsion speed of about 1mm per second, force size to make the lead core edge crushing or plough film is appropriate
