Northumbria Optical Coatings Ltd
Please note that we are closed for our annual shutdown and all orders placed from 19th July will be processed on our return on 7th August 2018.

Gas Bands

A range of special purpose narrow band filters for gas and vapour analysis are generally available ex-stock at very competitive prices. Details are given below. Specifications are based on general customer requirements and experience over many years, although tighter tolerances, different bandwidths and filters for other gas bands are available on request.

Typical Performance


Range of CWL available Bandwidth at half of peak transmittance CWL tolerance Transmittance at CWL Blocking range limits
1.94µm (H2O) 4-5% ±1.5% > 60% 0.3-30µm
2.70µm (CO2) 4-5% ±1.5% > 60% 0.3-30µm
2.95µm (H2O) 4-5% ±1.5% > 60% 0.3-30µm
3.46µm (HC) 4-5% ±1.5% > 60% 0.3-30µm
4.26µm (CO2) 4-5% ±1.5% > 60% 0.3-30µm
4.50µm (N2O) 4-5% ±1.5% > 60% 0.3-30µm
4.70µm (CO) 4-5% ±1.5% > 60% 0.3-30µm
5.25µm (NO) 4-5% ±1.5% > 60% 0.3-30µm
7.40µm (SO2) 4-5% ±1.5% > 60% 0.3-30µm
10.60µm (CO2) 4-5% ±1.5% > 60%


Buy filters online

View our online catalogue

Need a bespoke product?

We have a wide range of filters available for purchase through our online catalogue. If you canít find the product you need, please click here to contact us and discuss bespoke orders.

Click here to get in touch