Benefits
- Reliable, simple, and effective technique to evaluate the hardness of many coatings.
- Versatility for different types of coatings and industrial sectors — automotive, furniture, etc.
- Allows quick pencil changes, reducing downtime.
- Repeatability is assured by the pencil holder.
- Resource optimisation — fewer stops and errors reduce material waste.
- Complies with the most demanding international standards, including UNE EN ISO 15184 and ASTM D 3363.
- Basic equipment includes 14 pencils (6B to 6H). Optionally harder pencils (7H, 8H and 9H) can be added for more demanding tests.
How does the Wolff-Wilborn test work?
- Pencils of known hardness are moved across the coating surface under a fixed load of 750g and at a 45° angle.
- The hardness of the film is determined by the pencil that damages the coating.
To perform the test, please see the following step-by-step instructions:
- Prepare and properly clean the surface.
- Select the pencil according to the hardness scale.
- Sharpen the pencil before the test.
- Place the pencil holder on the sample.
- Adjust the pencil in the corresponding hole until it touches the surface and tighten the side locking screw.
- Slide the device 6 to 12 mm over the surface, holding the scratch tester machine by the centre of the wheels.
Industries & Applications
- Automotive.
- Furniture.
- Quality control labs.
- Synthetic resins.
- Varnishes and industrial paints.
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