This OT
Film har  Hardness is paint manufacturing,paint use(paint table) industries will test the quality indicators identified.Pencil

 Scratch coating hardness test is a test method since the 1980S is widely used internationally.Instrument can be used

 Scratc   in the laboratory,is also applicable to the construction site,and can be in any direction on the film hardness were identifie  identified.

Features:

Pencil scratch is a kind of scratch hardness tester.This is a quick and easy way to do it.To scratch the surface of a coating with a sharp edge or rough surface.Test the hardness of the coating.It can be used in the production process,such as the coil coating.
　

Structure and principle :

Instruments for mechanical three-point contact with the measured surface(two o’clock for the round,is to lead core) is always guaranteed pencil and measured surface 45 degree angle to the horizontal force pushing the instrument movement to complete the testing process,measuring coating ability to resist deformation.

Test principle:

he pencils of different hardness grades are moved on the surface of the paint film at a 45 degree angle.The hardness of a pencil is determined by two hardness levels.The softer one produces a trace,another hardness level will produce a noticeable scratch on the coating.

Design and function:font>

Test program:

1) Put the tester on the flat(if the test piece is smaller than the instrument,set test piece placed in front of the instrument and the gasket on the bottom front of the instrument,the purpose is to maintain the level of the instrument)
2) With a blade pencil,so refill protruding part about 2-5mm,and polished in sandpaper,the pencil

into the instrument,so refill after contact with the test piece and fixed locking(recommended:pencil is six gon,select a fixed plane,after the test,a circumferential surface can be used three times) during the test to remove the gasket.
3) With the thumb and middle finger to grasp the center of the two wheels,The instrument from theback to push about 1-2cm away instruments(Do not add any pressure to push the instrument).Determine the hardness,see specimen for scratches,Recommended test pieces do at least three locations or more,taking the average.

Item Included(027054):

1*500G Pencil Hardness Tester