Included in this category are acrylic, modified-acrylic, polycarbonate and copolymer sheets. Acrylic resists fading and general discoloration.
Rigidity is probably a plastic's most important trait for sign applications.
Because both flat and formed face panels are installed in narrow retainers at the sign cabinet perimeter, a face's ability to maintain its original dimensions is critical in preventing damage or blowout. Perhaps the most difficult lesson many sign novices learn is that pan faces have an important function. Although flat sheets are suitable for small signs, larger signs demand additional rigidity at the perimeter, where the flange fits into the retainer frame. The pan's sides achieve this rigidity, and the pan reinforces the panel near the edges. Large, flat sheets installed in outdoor signs commonly blow out in the first windstorm.