Which test creates a rating to determine the scratch resistance of an AR coating?

Which test creates a rating to determine the scratch resistance of an AR coating?

• A. Parker
• B. Bayer
• C. Mayer
• D. Schmidt

Answer: (B)

Evaluating how scratch resistance of an AR coating is quantified through a standardized abrasion test. In this approach, a controlled abrasive interacts with the coated surface under set conditions—load, stroke length, and speed—to simulate wear. After the test, you look for visible scratches, coating delamination, or loss of AR performance. The result is a rating that reflects how well the coating stands up to scratching, allowing comparisons between coatings. The Bayer method is the standardized procedure that specifies how this rating is generated. It provides the defined apparatus, abrasive, loads, and scoring criteria used to produce a numeric or ordinal rating of scratch resistance. That’s why it’s the correct choice: it’s the test that creates the rating used to compare AR coatings. Other named tests aren’t recognized in this context for producing this specific scratch-resistance rating.

Evaluating how scratch resistance of an AR coating is quantified through a standardized abrasion test. In this approach, a controlled abrasive interacts with the coated surface under set conditions—load, stroke length, and speed—to simulate wear. After the test, you look for visible scratches, coating delamination, or loss of AR performance. The result is a rating that reflects how well the coating stands up to scratching, allowing comparisons between coatings.

The Bayer method is the standardized procedure that specifies how this rating is generated. It provides the defined apparatus, abrasive, loads, and scoring criteria used to produce a numeric or ordinal rating of scratch resistance. That’s why it’s the correct choice: it’s the test that creates the rating used to compare AR coatings. Other named tests aren’t recognized in this context for producing this specific scratch-resistance rating.