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Proceedings Paper

Fun facts about pitch and the pitfalls of ignorance
Author(s): Birgit E. Gillman; Flemming Tinker
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Paper Abstract

The various properties of polishing pitches have different advantages and are selected according to the type of work intended. It is important to check pitch properties before a pitch lap is poured; to ensure that the final polishing lap properties will be as desired. A simple penetrometer test is utilized as a quality control tool for measuring the hardness (viscosity) of various types of pitch as received from the manufacturer. Only a small sample, 20 grams, is needed for this test. Another simple method for determining pitch quality is the measurement of the softening point. A description of this method and typical results will be described. Lastly, the 'tackiness' of pitch and its importance will be discussed.

Paper Details

Date Published: 11 November 1999
PDF: 8 pages
Proc. SPIE 3782, Optical Manufacturing and Testing III, (11 November 1999); doi: 10.1117/12.369240
Show Author Affiliations
Birgit E. Gillman, Zygo Corp. (United States)
Flemming Tinker, Zygo Corp. (United States)

Published in SPIE Proceedings Vol. 3782:
Optical Manufacturing and Testing III
H. Philip Stahl, Editor(s)

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