ADA Signage: made in Raised Photopolymer or 1/8” Acrylic with Raised Letters: Photopolymer is a one piece plastic type of ADA sign with built in Braille and offered in custom colors. This type of material is often used in high-traffic locations such as schools, hospitals, housing projects, and office buildings. A more cost effective material is our laser engraved appliqué letters mounted to acrylic.