| Float glass windows are an inexpensive product that can be used as a protective element between two environments. They are cut from sheet glass that is relatively flat and parallel, making it suitable for most purposes and without the need for polishing, they are available at a very reasonable price. Our stocks supply standard thickness down to 1.1mm, however thinner windows can also be supplied to special order. The stock listed below are uncoated rectangular white float windows of various dimensions. Specifications: | Material: | White Float Glass (3mm / 6mm thk) | | Diameter: | +0, -0.2mm | | Length, width: | ±0.25mm | | Thickness: | nominal | | Flatness: | 1/2 λ/10mm dia (1.1mm thk) 1-2 λ/25mm dia (3mm/6mm) | | Float type | 0.5λ over 10mm dia (1.1mm thk) | | (typical) | 1-2λ over 25mm dia (3mm/6mm thk) | | Polished grade | λ/2 or over 90% of aperture dimensions | | Surface Quality: | <60-40 scratch/dig | | Parallelism: | <1’ (polished type) | | |