Both the industrial grade and the laboratory UV-Vis grade are heat-resistant up to 1450°C. Both are highly resistant to acid, base, and organic solvents. The size variation is within 0.05 mm and 0.10 mm for the laboratory UV-Vis grade and the industrial grade, respectively. The UV-Vis grade fused quartz plates are suitable for optical applications over the range of 190-2500 nm with the transmission rate above 83%. These double-side polished fused quartz plates are suitable for various research laboratories and industrial applications. If the optical transmission is not important for the applications, please select the industrial-grade fused quartz plates. If the applications require higher precisions in optical transmission, surface flatness, or surface roughness, please select the UV-Vis grade fused quartz plates.