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Testing in Accordance with ISO 15184 & EN 13523-4
1. Starting with the softest lead (6B), insert a pencil into the test cart.
2. Remove the Leveling Rod from under the cart and immediately
push the cart away from the operator at a slow constant speed for
approximately 6 mm (0.25") —long enough to enable a visual
inspection of the coating.
3. Unless otherwise agreed, wait 30 seconds before assessing the
coating for a defect of at least 3 mm using normal corrected vision.
A magnifying lens may be used by agreement with all interested
parties.
NOTE:
To make visual inspection easier, lead markings can be
cleaned from the coated surface using a soft cloth or cotton swab and
a solvent inert to the coating.
The following types of defects can be produced by the test:
a) Plastic deformation – a permanent indentation or gouge in the
coating surface without cohesive fracture
b) Cohesive fracture – a visible scratch or rupture in the surface
of the coating, material having been removed
c) A combination of the above two defects
4. If no defect of at least 3 mm has been made, repeat Steps 2 and 3,
moving up the hardness scale one pencil at time until such a mark
is made.
5. Once a defect has been made, repeat the test moving down the
hardness scale until no marking occurs.
6. The hardness of the hardest pencil which does not create a defect
in the coating should be reported as the Pencil Hardness test result.
7. Perform the procedure detailed in Steps 1 – 6 twice. If the results
differ by more than one unit of pencil hardness, discard the results
and repeat the test.
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