Polycarbonate is an ideal lens material for corrective eyeglasses and sunglasses: It is lightweight, impact resistant, durable, and comfortable. However, not all polycarbonate for eyewear applications is created equal. Special lens-quality grades have been developed by Covestro. Its Makrolon® polycarbonate is characterized by excellent optical properties, high mechanical strength, toughness, and comfort. Original equipment manufacturer Jiangsu Sigo Optical decided to upgrade the polycarbonate material used for its corrective and sunglass lenses.
For corrective lenses, Makrolon® DP1-1821 polycarbonate is used. It is formulated specifically for the ophthalmic market. Available in clear tints, the material offers advantages for corrective lenses such as high optical purity, transmission and scatter resistance, and UV stabilization. In processing, the material is distinguished by its high viscosity and easy release from the mold.
Makrolon® LQ2887 polycarbonate, a new optical grade, is used for high-performance sunglass lenses. The abbreviation “LQ” stands for “lens quality”. Makrolon® LQ2887 polycarbonate provides UV protection from wavelengths up to 400 nm, which blocks both energy-rich UVA and UVB rays.
- Covestro AG, Leverkusen, Germany
- Jiangsu Sigo Optical Co., Ltd. (“Jiangsu Sigo Optical”), Danyang, China