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When it comes to a high quality IR Cut filter, it is the substrate with the coating applied that affects the performance. Knight Optical provide high quality wafers for precisely this, and the surface quality of our substrates eliminates blotching at the sensor which occurs on lower quality substrates especially where IR Cut filters are concerned. Our wafers are produced as thin as 500μm & provide exceptional surface quality. However, we can manufacture to a fully customised specification with a wafer thickness as little as 10 μm. Our substrates for stock or custom can be manufactured from a great deal of materials including: •Quartz •Borosilicate •BK7 or equivalent •Sapphire •And many more. Depending on your application for the IR Cut Filter, we can help advise on the best achievable optic for your application. Please read PDF for full specification Material::Borosilicate or equivalent Diameter::+0.0 / -0.20 mm Length / width::± 0.20 mm Thickness::± 0.20 mm Surface quality::<60:40 scratch/dig Transmission::Tavg>94% 420-620nm Blocking::Tmax<2% 700-1000nm Wavelength accuracy::+/-10nm Front surface:Hot mirror coated Rear Surface:AR coated