Several methods of adhesion measurement;
The cross-cutting method cuts the coating into small squares to reduce side adhesion, and is evaluated according to ISO, ASTM or company standards. Advantages: fast, low cost, comparison method-see table below.
Possible restrictions: applicable to a certain thickness range, flat coating measurement application range: paint and powder coating thickness up to 125μm (5mils).
The drawing attachment method adheres the circular forging die to the surface of the coating. After the adhesive dries, the force required to pull the circular forging die away from the surface of the coating is measured.
Advantages: easy to use, quantitative measurement-gives a certain adhesion value.
Possible limitations: It takes time to wait for the adhesive to dry.
Scope of application: laboratory or outdoor use-flat or curved surface
The advancing attachment method is similar to the drawing attachment method. The circular forging die is adhered to the surface of the coating. After the adhesive dries, the force required to push the circular forging die out of the coating surface is measured.
Advantages: The adhesive dries quickly, making it an ideal tool for measuring curved surfaces.
Possible limitations: The force of the instrument pushing out the round forging film is too large, which will damage the thin substrate surface.
Scope of application: Pipeline and metal spray coating.
When choosing an adhesion tester, it is very important to choose the same detection method for the traditional Chinese medicine throughout the observation to ensure an accurate comparison
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