Shenzhen PCB pencil hardness test, find amp detection, industry leading!
Hardness test:
1 Test Objective: to test the hardness of green.
2 instruments: standard hardness pencil: 6H model pencil
3 test methods:
3.1 with knife sharpening pencils, with fine sandpaper to sharpen pen tip.
3.2 samples will be placed in the table, first with a 6H pencil to General Dynamics in the sample surface, and then tilted 45 degrees to the direction of the sample pencil nib in the push across the surface anti welding paint is about 1/4 long.
3.3 if the solder paint doesn't have to be scratched or damaged, on behalf of sample hardness >6H.
3.4 if the paint has been marked with a mark, the hard