Yellow Foils for the Clean Room
Yellow Foil Requirements
The spectral sensitivity of common photo resists ranges from the near UV to the short wave VIS part of the spectrum. The g-line absorption maximum at 435 nm wavelength is centred in the blue part of the spectrum and drops towards longer wavelengths without sharp absorption edge.
Therefore, in order to allow the storage of a resist-coated substrates under yellow-light conditions over hours without unintentionally exposing the resist film, wavelengths < 500 nm have to be completely blocked below the detection limit.
At the same time, wavelengths > 540 nm which correspond to the sensitivity maximum of the human eye should be sufficiently transmitted by the yellow foil. Both requirements allow a safe and reproducible resist processing with reasonable energy consumption for the clean room illumination.
Our Yellow Foil ASF SFG 10
Our yellow foil ASF SFG 10 completely blocks all radiation with wavelengths < 500 nm, and yields a high transparency for wavelengths > 540 nm. Thus the ASF SFG 10 is perfectly suited for the processing for all common photo resists.
Fields of Application
Our yellow foil ASF SFG 10 can either be attached to windowpanes with UV stable double-faced adhesive tape (also supplied by us), or – assembled in Polycarbonate bushing - fixed around white Hg fluorescent tubes.
We supply both systems – please contact us for further information!
For an offer, please contact us via:
e-mail: sales@microchemicals.com
phone: +49 (0)731 36080 409
fax: +49 (0)731 36080 908
Thank you very much for your interest!
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