Overview
JFL QHQ-3084 Pencil hardness tester is a Portable Pencil hardness tester with three load configurations of 500g/750g/1000g, of which 500g is the main weight and 750g and 1000g are the additional weight. The instrument manually pushes the trolley to measure the Hardness value of the paint film by using pencils with different Hardness. The product is designed and manufactured according to GB/T5739-1996 standard and is suitable for the determination of paint film Hardness in paints, coatings, inks and other fields.
Features
1. Provide three load configurations of 500g/750g/1000g
2. Portable design is easy to use on site
3. Adopt mechanical structure, easy to operate
4. Standard 13 Chinese pencils
5. Comply with the national standard GB/T5739-1996
Principle
The QHQ-3084 Pencil hardness tester adopts a mechanical structure. It touches the tested surface through three points, two of which are wheels and one is a pencil lead, and maintains a 45-degree angle with the tested film. Pencil hardness tester moves horizontally to measure the film's ability to resist deformation.
Applications
Paints, Coatings, inks
Steps
1. Preparation materials: three pieces of preparatory inspection according to GB1279-79
2. Sharpen the pencil: use a pencil sharpener to sharpen the pencil until the cylindrical lead lead is exposed 5-6mm, and rub the lead with sandpaper to get a flat and sharp end face
3. Install the pencil: put the hardness gauge on the workbench, put the pad below, insert the pencil into the main hole, and tighten the screws after the edge of the pencil touches the workbench
4. Test: put the hardness gauge on the test plate and push forward with force at a speed of about 1mm per second
5. Determine Hardness: Start testing from the hardest pencil, and each level of pencil plows five 3mm long marks until a pencil that does not plow the film is found. Hardness is film Hardness
Notice
• Do not loosen or cut the refill
• The end face of the pencil lead should be flat and the edge should be sharp
• Propulsion speed should be maintained at about 1mm per second
• Each level of pencil needs to plow five 3mm long marks
• The test force should be such that the lead core edge is crushed or the plough film is damaged
