Aerocel ULP Ultra-Low Perm Sheet & Roll Insulation offers exceptionally low water permeability, and is a flexible closed-cell alternative to cellular glass. Plus, it’s made with a proprietary blend of non-polar EPDM rubber that makes it uniquely durable even in extreme environments. ULP is ideal for demanding applications - very cold service temperatures in high temperature and humid operating environments. Most thicknesses are available with or without a pressure-sensitive adhesive (PSA) back for faster installation.