7 September 2013 A comparison of equivalent moldable glasses
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Abstract
There are over one hundred types of glass that are sold as moldable grades. These moldable glasses are manufactured by a limited number of suppliers; each manufacturer with their own grade and designation. Many of these grades can be found to have groupings across the manufacturers, indicating possible equivalency. Equivalency of materials is an important consideration for an optical system as it would eliminate dependency on a single source, and generate cost competition. In order to establish optical equivalency it is necessary to establish significant similarity between materials. This paper compares moldable glass grades from several equivalent glass types from different manufacturers both theoretically and experimentally. Experimental data is based on precision glass molding of the same lens using different but equivalent grades of glass and using standard lens criteria for comparison. Conclusions on whether specific glass types are truly equivalent are then established.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alan Symmons, "A comparison of equivalent moldable glasses", Proc. SPIE 8838, Optical Manufacturing and Testing X, 88380X (7 September 2013); doi: 10.1117/12.2024365; https://doi.org/10.1117/12.2024365
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