The Scratch Standard is Only a Cosmetic Standard

M Young

doi:10.1520/STP18738S

SYMPOSIA PAPER Published: 01 January 1988

STP18738S

The Scratch Standard is Only a Cosmetic Standard

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In this paper, I present a history of the scratch and dig standard for optical surface quality and show that this standard has since its inception been recognized as a cosmetic standard and not as an objective or performance standard. In addition, I attempt to dispel the myth that the scratch standard was changed during the 1960's and show that scratch number cannot be related to scratch width. Finally, I describe a preliminary aging experiment that suggests that the scratch standards have not aged with time and are, in fact, extremely stable.

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Young, M

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Details

Developed by Committee: F01

Pages: 153–158

DOI: 10.1520/STP18738S

ISBN-EB: 978-0-8031-5031-7

ISBN-13: 978-0-8031-4479-8

The Scratch Standard is Only a Cosmetic Standard

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