Light Flint Glass
Light Flint Glass is referred to as QF glass. The refractive index and density are smaller than flint glass. It basically belongs to the Na2O-K2O-PbO-SiO2 system with a PbO mass fraction not exceeding 40%. Mainly used as a material for optical parts in optical instruments, such as optical lenses, prism and Cylindrical lenses.
By modifying the glass formula, the optical glass without lead, arsenic and cadmium and other radioactive elements is expressed by a prefix "H-" indicating its envioronment-friendly characteristics, for example: H-QF1
