Plastic & Metal Composites
Plastic core usually made of PVC, either solid or corrugated, sandwiched between two thin layers of aluminum. Brand names may include Dibond, Alumacorr, Signabond. Typically used in 3mm thickness for the solid core, and 6mm thickness for the corrugated core. Other thicknesses are available and these are also available with colored baked on enamel faces.