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 - Float grade 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 Bulk Discounts! Where (B) appears next to a price below, bulk prices are available, click the (B) button to view! PDF Part No. Material Size/dimensions (mm) Thickness (mm) Price Qty Buy WGP1000 LEGB 10 dia 1.1 £4.95 WGP1600 LEGB 16 dia 1.1 £5.50 WGP2500 LEGB 25 dia 1.1 £5.95 WGP4000 LEGB 40 dia 1.1 £6.00 WGP5000 LEGB 50 dia 1.1 £7.30 WGP5050 LEGB 50 x 50 3.3 £6.95 WGP5051 LEGB 50 x 50 3.3 £8.45 Knight Optical > Windows > Borosilicate - Float grade
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)