Correx is the fluted light weight board that estate agents often use, it's 4mm thick.
ACM is a strong board consisting of a hard plastic core sandwiched by to thin sheets of aluminium. This is our strongest and most durable board, it's 3mm thick.
Plastic board, commonly known as foamex , is a compressed foam board, strong, but can get brittle over time and in the cold, it's 5mm thick.
Self adhesive vinyl, adhesive on the back suitable for 3-5 year outdoor duration. It's laminated with a clear vinyl film to protect the print.
All materials are suitable for outdoor conditions.