19 May 2003 Characterizing optical polishing pitch
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Characterization data for five experimental optical polishing pitch products were compared to those for corresponding standard commercial optical polishing pitches. The experimental pitches were tested for three physical properties: hardness, viscosity at 90°C, and softening point. A Shore A Durometerl test was used to measure hardness. Viscosity data were collected using a Stony Brook Scientific' falling needle viscometer. Softening point was determined using the ASTM D3104-97 method. Results demonstrate that the softest and the hardest batches of the experimental grades of optical pitch are comparable to the industry-accepted standards, while the other grades of pitch are not. The experimental methodology followed in this research may allow opticians to rapidly compare different brands of pitch to help identify batch- to- batch differences and control pitch quality before use.
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Rupal Varshneya, Rupal Varshneya, } "Characterizing optical polishing pitch", Proc. SPIE 10314, Optifab 2003: Technical Digest, 103140U (19 May 2003); doi: 10.1117/12.2284019; https://doi.org/10.1117/12.2284019

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