Hand push pencil hardness tester
Model: STY
Product Overview
The hand push pencil hardness tester is one of the three types of pencil hardness testers, designed and manufactured in accordance with the national standards GB/T6739-2006 "Pencil method for determining the hardness of paint films for paints and varnishes" and ISO 15184-2012 "Pencil method for determining the hardness of paint films for paints and varnishes". It also meets the requirements of GB/T 17657-2013 "Test methods for physical and chemical properties of artificial boards and decorative artificial boards", providing a fast and economical testing method for determining the hardness and scratch resistance of sample paint films.
Structure and working principle
Using three-point contact with the tested surface (two points as rollers and one point as pencil lead), the angle between the pencil and the tested surface is 45 °. After removing the underlying aluminum block, there are three specifications for the pressure applied by the main body on the pencil lead: 500 ± 30g, 750 ± 30g, and 1000 ± 30g (as shown in the figure). Measure the hardness of the paint film by drawing a pencil with a known hardness rating on it.
Compliant with standards
GB/T 17657-2013 Test methods for physical and chemical properties of engineered boards and decorative panels 4.57 Determination of paint film hardness
GB/T 17657-2022 Test methods for physical and chemical properties of engineered boards and decorative panels 4.58 Determination of paint film hardness
Technical parameter
Body size: 100 * 80 * 100mm
Pen tip pressure: 500 ± 30g, 750 ± 30g, 1000 ± 30g
Removable weight: 2 * 250g
Pencil: 13 pack of Chinese pencils (6B~HB~6H); 17 sets of Japanese Mitsubishi pencils (6B~F~9H);
Experimental steps
1. Prepare the substrate according to GB/T9271 "Standard Test Panels for Paints and Varnishes".
2. Sharpen the pencil to expose the lead core by 5-6 millimeters (keeping the lead core cylindrical), and keep the pencil perpendicular to the sandpaper to polish the end face of the lead core until it becomes a complete circle with no broken or chipped edges. Before each use, pencils need to be polished in this way.
3. Unless otherwise agreed, measurements shall be conducted under conditions of 23 ± 2 degrees Celsius and 50 ± 5% humidity.
4. Install the pencil according to the attached diagram and push it at a speed of 0.5-1mm/s for at least 7mm. Use the indicated hardness of the hardest pencil that does not cause scratches of 3mm or more on the paint film to indicate the pencil hardness of the paint film.
5. Parallel measurements should be taken twice. If the results of the second measurement are inconsistent (with a difference of more than one pencil hardness unit), the test should be redone.