ProRox® PSM 971 ALU UK is designed for thermal and acoustic insulation of large diameter pipes, ducts, chimneys and small vessels. ProRox PSM 971 ALU UK consists of rigid slabs with factory machined grooves on the inside face to specifically suit large pipe and vessel diameters. The distance between the grooves is calculated to ensure that ProRox PSM 971 ALU UK closely fits the pipe or vessel with all grooves tightly butted together.