3.9: Hardness and Scratch Resistance

3.9 Hardness and Scratch Resistance

LDPE is easily marked by a thumbnail, HDPE is scratched in this way with difficulty, but PP is marked little, if at all. Hardness is defined as the resistance of a material to deformation, particularly permanent deformation, indentation, or scratching. Hardness is a relative term and should not be confused with wear and abrasion resistance. Many tests have been devised to measure hardness. Rockwell and Durometer hardness test are commonly used.

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