ASTM D3363-00 Pencil Scratch Method Film Hardness Pencil Coating
Hardness Tester
Product details
Coating hardness is the necessary measurement for the performance
of coatings. This instrument applied the Pencil Scratch Method. It
is a fast and economical way to determine the film hardness using
the drawing lead core or the pencil core. The pencil scratch method
for coating hardness testing is a common method in the world since
the 1980s. In China, this test method has also been promoted to the
coating research and industrial production. The instrument can be
used both in laboratory and on site.
Referenced standard, Coating Hardness Pencil Test Method Standard
Test Method for Determination of Coating Hardness by Pencil Test
Method General Method for Preparing The Film 2.
Specification and principles
Load Weight 1000g /750g /500g Measurement Angle (Between Pencil and
Measured Surface), 45° Three Touch Points (Two Wheels, a Pencil
Core). Scratch Speed: about 1mm/s.
Usage
The instrument applies mechanical measurement. Keep three point
touch the coating (two wheel, a pencil core), and a 45 degree angle
between pencil and test surface. Push the instrument sliding,
pencil draws the corresponding track in the coating. In the change
of different pencil marks, the hardness value of the film can be
determined.
Structure
1 - Horizontal Mark
2 - Pencil
3 - Wheel
4 - Coating
5 - Base Material
6 - Weights
7 - Screw
8 - Moving Direction
9 - Pencil Core
Standard Configuration
Pencil Hardness Tester..............1
1000g Weight............................1
750g Weight..............................1
Pencils (6B-6H).......................13
Eraser.......................................1
Knife.........................................1
Horizontal Pad Block................1
Sandpaper.................................1
Manual, certificate ....................1 each
NOTE
* When sharpening pencils, pay attention that the core should be
cut out the shape of a cylinder.
* When inserting a pencil into the tester, it is necessary to use a
horizontal pad block, so as to avoid the angle deviation.
* When pushing forward the tester, don't push too hard, ensure the
force is enough to keep the tester moving forward, so as to avoid
breaking the pencil.
* After drawing one line, it is necessary to release the fastening
screws and rotate the pencil to draw another line.
* To choose pencil in test procedure: In accordance with the order
of 6H-5H4H-3H-2H-H-HB-B-2B-3B-4B-5B6B, from hardest to softest.
* Check the appearance and property of sample before using the
instrument. Ensure that the test sample is with regular property,
no damage, no cracks, no scratches, etc. And the surface is smooth.
* It is recommended to wear gloves to use this instrument to
prevent rusting.
