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P-SF67 Lead- and Arsenic-Free Glass
Oct 2006
SCHOTT North America Inc., Advanced OpticsRequest Info
DURYEA, Pa., Oct. 4, 2006 -- Schott North America has introduced its new lead- and arsenic-free P-SF67 glass to North American manufacturers of compact lens systems.

P-SF67 possesses a high refractive index of nd = 1.90680, a low glass transformation temperature of 493 °C, and an abbe number of vd = 21.40. P-SF67 has been developed to achieve the ultimate in image quality and compactness for consumer and industrial optic applications, the company said.

SchottGobs.jpgAspherical lenses are increasingly being used to build the compact high-performance lens systems found in camera phones, digital cameras, sport optic devices and medical devices. A single aspherical lens is able to compensate for image distortion and spherical aberration as efficiently as several spherical lenses. The use of an aspherical lens reduces the optical devices’ size and weight, meeting the market’s demand for smaller optical devices.

Aspherical lenses are made by pressing a polished or fire-polished preform made from low Tg glasses in a precision mold at temperatures typically between 400 and 600 °C. Low Tg glasses with low transformation temperatures lengthen the lifetime of the mold and provide a higher output of aspherical lenses, reducing costs for the precision mold process.

P-SF67 is currently available to Schott North American customers as polished preforms.

For more information, visit:; e-mail: 

Schott North America Inc.
555 Taxter Rd.
Elmsford, NY 10523
Phone: (914) 831-2200
Fax: (914) 831-2201


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