Low iron Tempered glass What is it? Low iron Tempered glass also called ultra clear tempered glass, super clear tempered glass and super white glass. Low iron tempered glass, by reducing the iron content you reduce the greenish tint, while increasing light transmission, brightness and clarity.  In fact, low iron tempered glass can have as little as 10% of the iron content of regular glass, allowing it to transmit 91.5% of light, compared to 83% for regular glass. Low iron tempered glass is a high-quality, multi-functional new high-end glass products. low iron tempered Glass is available upon customized sizes. Advantage: (1)High visible light transmittance, good permeability. (2)Elegant and luxury effect (3)Color consistency