Product name, polyurethane insulation pipe model DN200 DN150 DN100 sample description, polyurethane insulation pipe, test category, random inspection production date 2021-07-15 inspection date 2021-07-15 number of products 223 inspection items, test index conclusion qualified thermal conductivity of density 60 kg/m 3≤0.033 W/(m. K) qualified radial compression strength ≥0.3 mpa qualified water absorption 10% qualified porosity ≥88% qualified cavity ≤1/3 mm qualified average bubble size ≤0.5 mm qualified