Schott Introduces Lead-Free Glass

Schott North America Inc. has introduced lead- and arsenic-free P-SF67 glass with a refractive index of 1.90680, a glass transformation temperature of 493 °C and an Abbe number of 21.40. The glass is suitable for the production of aspherical lenses used in compact lens systems. Aspherical lenses fashioned from this glass reduce the size and weight of camera phones, digital cameras, sports optics and medical devices. The company says that a single aspherical lens can compensate for image distortion and spherical aberration as efficiently as several spherical lenses can. The P-SF67 glass is available as polished preforms.