(I'm new to EE.SE, so I don't know if this is on-topic here. Please forgive me.)
From what I understand, capacitive touch technology relies on coating one side of a resistive material with a conductor; this conductor is usually indium tin oxide, and the resistive material is almost always glass or some substance based on glass.
Why can't the resistive material be replaced with a thermoplastic, such as PMMA/acrylic or polycarbonate? Surely, that would make the panel quite a bit stronger than the glass-based panels that are used. Edit: This is definitely possible. If this is possible, why don't any manufacturers produce plastic-based projected capacitive touch panels? (Or is there one that does, and I just haven't come across it?)