One of our Products , IKO enertherm ALU . ALU is a 100% CFC, HCFC or HFC-free insulation board with a rigid polyisocyanurate foam core, clad on both sides with a multi-layer gas-tight aluminium construction. This high-quality reflecting ALU cladding consists of no fewer than seven layers, combined into a single construction. It is tested under extreme conditions regarding water absorption, mechanical properties, corrosion resistance and emissivity. Here's the technical detai ls : ๐น Bulk density: ± 32 kg/m³ Compressive strength at 10% deformation: 175kPa (17.5ton/m²) ๐น Behaviour under uniformly distributed loading: Class C (≤ 5% deformation at 80°C and 40kPa loading) ๐น Closed cells: more than 95% ๐น Water vapour diffusion: PIR foam: ฮผ = 60 – ALU facing ฮผ > 100,000 ๐น Moisture insensitivity class 1 : (<1 p="">