What materials are usually used for graphic overlay（Lexan label) ?
Gavin Xu(Membrane switch)
Engineer and Sales Manager,JCF Technology have own perfect membrane switches, PCB membrane keypads, FPC membrane circuits,Rubber silicone keypad engineering development & design,production and quality control system.
The three usual materials utilized for the graphic overlays(Lexan label) are:
Lexan (Polycarbonate), Mylar (Polyester), and Vinyl (PVC).
Polyester offers the best flex life and chemical resistance. Therefore it is the most recommended material used for graphic overlay(lexan label) use.
Polycarbonate offers better weathering characteristics and ink adhesion.
Polycarbonate is superior for high temperature applications when the overlay is embossed.
Polycarbonate (when embossed) will withstand 90 degrees C as compared to 60 degrees C for embossed polyester.
PVC’s are cost saving when the overlay is textured all over (i.e. without digital display windows)and offers excellent chemical resistance.
Surface finishes include velvet textured, anti-glare matte, gloss clear, selectively textured and anti-microbia
The following chemical resistance specifications were prepared from the material manufacturers'data sheets. Manufacturers and distributors of the raw materials can be contacted directly if explicit details are required.
An "A" rating represents no visible effect.
A "B" rating may have a visible effect not detracting from physical performance.
A "C" rating constitutes a harmful effect on the material.
Note that both the polyester and polycarbonate films are hardcoated, offering considerable advantages over untreated films.
Transparent windows can be designed into the graphics for the insertion of changeable or customized switch legends. This can be ideal for varying switch functions, different models using the same membrane switch or for different language versions.
More information visit:www.jcftechnology.com