Block Resistance

Definition - What does Block Resistance mean?

This is the property of a paint, which is described by its resistance to stick onto itself when two surfaces with the same paint application are to mate. This adhesion problem is caused by:

  • Not following paint or coating instructions in relation to drying times
  • Use of low quality paint or coats

Corrosionpedia explains Block Resistance

To determine the effect of block resistance, one ought to mate two surfaces upon reaching the required dry times. The substance used in making the paint or coat will easily show the degree of block resistance that it has.

Alkyd and acrylic latex paints (semi-gloss or gloss) are among the recommended quality coatings to curb the problem of adhesion caused by poor block resistance. Also, failure to use primers and top coats may lead to low block resistance.

Other conditions that may lead to low block resistance include:

  • Hardness of the coating or painting substance
  • The pressure applied on the two surfaces in contact
  • The surrounding humidity
  • The surrounding temperatures
  • The duration of contact between the two surfaces

The paint or coating with the highest block resistance is the best for corrosion prevention, thus the substrate will remain hidden under the uniform film structure. Therefore, the characteristic of the paint will depend on the substances used in the making of the coats and paints—particle size, polymer composition and VOCs used.

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