What form of insulation do you use for your coolers and freezers?

RSNE uses a pre-engineered Insulated Metal Panel (IMP) system. In most applications, the insulating core is 4″ polyisocyanurate foam, clad by 26-gauge, embossed Galvalume. The R-value for our panels is 7.2-8.0 per inch. For more extreme applications, 5″ and 6″ panel widths are available, as well as multiple metal skins, thicknesses, and colors. There is no wood or mechanical cam-locks in our IMP system.