Wolff Wilborn Pencil Coating Durometer ARW-506

Coating Hardness Tester ARW-506

This instrument offers a quick and easy method for determining the film hardness of a coating applied to a flat substrate according to the Wolff Wildorn method.

The test consists in the use of pencils of different degrees of hardness dragged on the surface through a specially designed trolley at an angle of 45° and pushed with a uniform pressure on the sample, all in compliance with the reference standards governing this method of measurement, ASTM D 3363, ISO 15184. The ArwMisure ARW-506 version offers a complete solution to fully satisfy these needs and is characterized by the particular manageability and compactness of the instrument.

Main features Durometer for coatings ARW-506

• Complies with international reference standards ASTM D 3363, EN 13523-4, ISO 15184:2012, JIS K 5600-5-4
• Built-in level located on top of the cart, convenient for checking level during testing.
• Test angle 45° and thrust with uniform pressure on the sample
• 2 different models available, Pencil lead pressure: 750g/1000g.
• Only three points of the surface are touched (cartwheels and pencil).
• Supplied with manufacturer's Certificate of Calibration

How to use and what is the Wolff Wilborn pencil hardness test

Why is it important to measure the hardness of a coating? If a coating, such as a paint film, does not dry (or cure) properly, it can negatively affect its performance, resulting in defects, poor adhesion and premature deterioration of the coating which can cause serious problems. The measurement of hardness can be a valid index of the degree of polymerization of the paint and one of the simplest and most widespread methods is certainly the Wolff-Wilborn pencil hardness test, where pencils of different degree of hardness from degree B (soft), passing from HB (medium) to H (hard). The tip is previously prepared with the use of an abrasive paper (grain 400) and the method consists in introducing the pencil inside a trolley with an inclination of 45 ° which applies a constant known force, it is sufficient to push the trolley on the coating to obtain the result by reading the mark left on the surface. This operation will be repeated with the different pencils starting from the lower degree of hardness to rise according to the reference specifications that we must respect. Alternatively, depending on the test method, you can start with the harder pencil and then decrease the hardness until the coating is scratched.

The ARW-506 Coating Safety Test comes with a set of 12 pencils (4B 3B-2B-B-HB-F-H-2H-3H-4H-5H-6H) to cover most needs.

Attention! This method is clearly destructive considering that the coating can be damaged by scratches and must be applied only on flat surfaces, consequently in the case of radiated surfaces it is advisable to prepare samples with which to carry out the tests that have carried out the same application and drying process. of the objects under examination.