Description:
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 identifi identified.
|
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 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.
|