Preparation technology of phase change perlite and ...
· Expanded perlite (EP) ... Expanded perlite (EP), its porosity up to 90%, was obtained from Lingshou Bochuan Mineral Processing Plant. Unit weight and water absorption of the perlite were 90 kg/m 3 and 310%, respectively. The particle diameter range of EP is – mm measured by a Sepctrex laser particle counter (MS2000, Malvern) and its specific surface area is m 2 /g .