Graphic overlay is made of PC （poly carbonate) or PET (poly elester), which specification is following:
|Graphic Overlay's material|
|Attribute||Polyestor (PET)||Poly carbonate (PC)|
|Temperature Resistance||limited when embossed||Good|
Difference between screen printing and digital printing (4 color printing):
Ink by screen printing is thicker than that by digital printing on overlay, which results in brighter colors and higher level of vibrancy for screen printing. So, Screen printing is more popular than digital printing; while digital printing can make much more details, such as gradually changing color.