Borosilicate windows Low-expansion Borosilicate (LEGB) Windows are very suitable for windows, because borosilicate glass has excellent chemical and thermal-shock resistance. We offer both 1.1mm windows made by the float process for general purpose applications and two grades of polished window, either λ/4 or λ/2 for more precision applications.
Knight Optical > Windows > Borosilicate windows Polished grade (Lambda/2) This is the section containing Polished grade (Lambda/2). Float type This is the section containing Float type. Only UK and EU customers are charged VAT at 17.5%, customers outside the EU and EU customers based outside the UK who have a valid EU VAT number will not be charged VAT Knight Optical > Windows > Borosilicate windows
Specification   Material: LEGB Material Data: (see materials section) Diameter: +0, -0.2mm Thickness ±0.2mm (float) ±0.1mm (polished) Flatness:      Float type (typical) 1λ over 10mm dia    Polished grade λ/2 or λ/4 over 90% of aperture dimensions Scratch-dig <60-40 Parallelism <1’ (polished type)
Specific requirements We can manufacture Borosilicate windows to any size at short notice, so if your requirements are not listed please contact us by telephone / fax or email: stockrequirement@knightoptical.co.uk Options available   · Mounting (circles up to 50mm dia.)   · AR and other coatings   · Edging to smaller diameters See also UV-fused silica windows (λ/2) Quartz windows (λ/2)