An acrylic sign face is a rigid, translucent or clear plastic panel that serves as the visible front surface of an internally illuminated sign. Made from polymethyl methacrylate (PMMA), these faces display graphics and let light shine through from the inside of a sign cabinet, pylon, or channel letters.
How It Is Made and Finished
Fabricators create acrylic sign faces by routing or laser cutting flat sheets of cast or extruded acrylic. The material is typically 3/16-inch or 1/4-inch thick. Graphics are added to the face using cut translucent vinyl, digitally printed translucent film, direct-to-substrate UV printing, or screen printing. Dimensional elements, such as push-through acrylic letters, can also be routed and mounted through the surface.
Flat vs. Pan-Formed Faces
Acrylic faces come in two main structural forms.
- Flat faces: These are flat sheets of acrylic mounted directly into aluminum cabinet retainers or channel letters.
- Pan-formed faces: Also known as thermoformed or vacuum-molded faces, these are heated and molded outward. The raised profile, usually 1.5 to 2.5 inches deep, provides extra structural rigidity, hides internal shadows from light sources, and allows for embossed lettering.
First Surface vs. Second Surface Graphics
Graphics can be applied to either side of the plastic sheet.
- First surface: Graphics are applied to the exterior, outward-facing side of the acrylic face.
- Second surface: Graphics are printed or applied in reverse on the inside, or back, of a clear acrylic face. The acrylic sheet acts as a barrier to shield the vinyl graphics from weather, UV abrasion, and vandalism.
Structural and Code Considerations
Acrylic expands and contracts with seasonal temperature changes, shifting about 1/8 inch for every three feet. Sign cabinets must be built with a perimeter clearance to let the face float without buckling. Flat panels larger than 4 by 8 feet can bow or blow out in high winds unless they are pan-formed, internally braced, or seamed together. Building codes classify the combustibility of light-transmitting plastics, which dictates the maximum allowable face area. These regulations vary by local jurisdiction.
Sign codes change and vary by zoning district and overlay. Confirm with the authority having jurisdiction before submitting a permit.
Frequently Asked Questions
When is acrylic used instead of polycarbonate?
Acrylic offers superior resistance to UV light, meaning it resists yellowing outdoors for a decade or more. Polycarbonate is much more impact resistant, making it better for areas prone to vandalism or severe hail, but it can fade or yellow faster than acrylic in direct sunlight.
How large can an acrylic face be without a seam?
Flat acrylic panels are usually limited to standard sheet sizes, such as 4 by 8 feet or 5 by 10 feet. Going beyond this size increases the risk of wind blowouts and bowing. For larger single pieces, fabricators often use a tensioned flexible vinyl face instead.
Can an existing acrylic face be reused during a rebrand?
Reusing an acrylic face depends on the original graphics application. If vinyl was applied to the first surface, the shop can sometimes strip it off and apply new graphics. If graphics were printed directly or embossed into a pan-formed face, the entire panel must be replaced.
How is a sign mockup created for a building with an acrylic sign face?
Sales teams can use sign estimating software or tools like Vuely. Vuely is AI sales software for sign companies. A rep visits a customer's site, captures a survey, and Vuely generates a photo-accurate mockup, checks local city sign codes, estimates price, and collects a signature.
Vuely is AI sales software for sign companies: site surveys, mockups on the customer's own building, and sign code checks before the quote goes out.