Lithoprotect® Yellowlight products for the Yellow Room
UV-filter ideal for photolithography
Yellow Foil Requirements
The spectral sensitivity of common photo resists ranges from the near UV to the visible blue part of the spectrum. Most of our resists are sensitive to g-line (435 nm wavelength). This wavelength is centered in the visible 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 substrate 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.
The Lithoprotect® UV protection yellow foil Y520E212 was designed specifically for UV-photo-sensitive applications and blocks UV radiation reliably below 520 nm. The Lithoprotect® yellow foil Y520E212 consists of yellow dyed cellulose triacetate. Due to the imbuing, a reliable UV-protection can be guaranteed also in demanding applications below nm 520. The Y520E212 UV blocking filter is applied in the area of photo lithography, printed circuit boards and microelectronics manufacturing, printing plates and photoresist production, as well as the handling of photoresists and diazo films. The films are used in pharmaceutical research, development and production.
The Lithoprotect® yellow foil Y520E212 is waterproof and resistant to oils, greases, benzine and aliphatic hydrocarbons. The yellow foil dissolves or swells with chlorinated hydrocarbons, ketone aromatic solvents. This can affect the optical properties. The UV protective foil is not resistant to concentrated acids
and bases. The foil is attacked in these substances.
Lithoprotect® Application Areas
The Lithoprotect® UV-protective foil Y520E212 can be cut like to paper. You can use double-sided adhesive tape for mounting it on windows, privacy screens, room dividers, lamps and front openings.
durXtreme recommend, however, for large windows applications, to use the Lithoprotect® UV protection film YSA520E212 self-adhesive. The Lithoprotect® yellow foil YSA520E212 can be glued with the mounting fluid DXMF301 easily and bubble-free on any smooth and solid surfaces.
For filtering fluorescent tubes (Y520E212 T5 and Y520E212 T8), durXtreme recommend the specially designed polycarbonate sleeves. Here, is the UV protective yellow film Y520E212 already incorporated, so you can cost-effectively “upgrade” standard white fluorescent tubes for your yellow light application.
We recommend the Lithoprotect® yellow light products for the filtering of short-wave radiation for the processing of photochemicals. These are divided into films (self-adhesive and non-self-adhesive) as well as ready-made filter bushings for fluorescent tubes.
The Lithoprotect® products are available at our partner company durXtreme GmbH.
UV-filter yellow foil
If you are interested in Lithoprotect® yellowlight products, questions on application or technical information, please contact our partner durXtreme.
You can also place your order through the Lithoprotect® online shop.
Phone: +49 (0) 731 36080916
Fax: +49 (0) 731 36080917
Lithography Application Notes
Our list of application notes with litho-related theoretical and technical background on all stages of micro-structuring can be downloaded from here:
> application notes