Ⅰ. Application and Characteristics:

The pencel hardness test is to determine the resistance of coating materials or lacquers to scratch effects on the surface.
Widely used for furniture or vehicle lacquers, but is also a usdfulaid in the development of synthetic resins or other film forming substances.14 pencils from grade 6B to 6H are provided.(Note:ASTM 3363 specifies 14 pencils. ISO 15184 required 20 pencil 9B-9H,ordered seperately).

Pencil Hardness Tester

Pencil Hardness Tester

Pencil Hardness Tester

Set  For Pencil Hardness Tester

Set  For Pencil Hardness Tester
 

Ⅱ. Structure and working principle: (figure):

Generally scratch hardnes is measured by moving a more or less sharp object under a known pressure over the surface of the material, inclined at an angel of (45±1)°。According to the principle of leverage, the instrument is designed so that it is in a horizontal position, the tip of the pencil exerts a force of :500±10 grams, 750±10 gram, and 1000±10 grams, onthe paint surface.

Ⅲ. Test Procedure:

a)Prepare substrate according to GB/T9271《Paints and varnishes - Standard test panels》.
b)Remove approximately 5mm to 6mm of wood from the point of each pencil, being careful to leave an undisturbed, unmarked, smooth cylinder of pencil lead. The tip of the lead shall be squared by holding the pencil in a vertical position and moving the pencil back and forth over abrasive paper, maintaining an angle of 90℃. Continue until a flat, smooth, circular cross-section is obtained, free from chips or nicks in the edge. Repeat this procedure each time a pencil is used. 
c)Carry out the test at a temperature of (23±2)℃ and a relative humidity of (50±5)%, unless otherwise agreed.
d)  Insert a pencil as figured, push the test panel at a speed of 0.5 mm/s to 1 mm/s for a distance of at least 7mm. The hardness of the hardest pencil which does not occur marking over a distance of at least 3mm is the so-called pencil hardness.
e)  Carry out the test in duplicate. If the two results differ by more than one unit of pencil hardness, discard them and repeat the test.

Ⅳ. Pencil arrangement:

Every equipment provides: thirteen high-level drawing pencils (6H-6B) .

Ⅴ. Operation video:

Ⅵ. Configuration list：

Ⅶ.  Ordering Information:

Ⅷ . Documents: