Standard for Thermosetting Powder Coatings

June 21,2022

  1. Under normal conditions, the thermosetting powder coating shows uniform color, no foreign matters and loose powder. It moves in the 120 mesh test sieve without residue.

 

powder coating

 

  1. Observe the film color of thermosetting powder coating under scattered sunlight, which should be within the range of color difference, and the film is allowed to have a slight orange peel.

 

  1. When tested with sodium hydroxide, if the film has no blistering, cracking, peeling, powder dropping or obvious discoloration, its alkali resistance has reached the qualified standard.

 

  1. When tested with hydrochloric acid, if the film has no blistering, cracking, peeling, powder dropping or obvious discoloration, its acid resistance has reached the qualified standard.

 

  1. The film made of thermosetting powder coating is placed in boiling water for a period of time. If the film does not appear blistering, cracking, peeling, powder dropping or obvious discoloration, its boiling water resistance has reached the qualified standard.

 

  1. Scratch the substrate of the coating thoroughly and check the corrosion or coating damage spreading from the scribed line. If there is no blistering, cracking, peeling, powder dropping or obvious discoloration within 2mm to 5mm of the scribed line, its salt spray resistance has reached the qualified standard.
 
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