- Technical Drawings
|Water Content||< 4%|
|Optical Purity||> 99.98%|
|Severity Index||< 1000|
|Refractive Index||@ 589nm||@ 546nm|
|Transmission||< 10% @ 370 nm|
|Share A Hardness||93 ± 2|
|Diopter Powers||12.5, 15.0, 17.5, 20.0, 22.5, 25.0, 27.5, and 30.0 D.|
Benz Hydrophobic materials require cryogenic conditions for machining. Cryogenic temperatures can be easily achieved using commercially available freezing devices that can be attached to the spindle of lathes. Blanks are mounted on a special mandrel using moisture. The mandrel is cooled to at least -20° C using a vortex freeze station. Once the mandrel is cooled, it is placed in the collet that is fitted with a cryogenic unit. The surface of the blank must be maintained at -20° C or below.
Dimension of the blank and the amount of material available for producing a custom anterior surface.