Good quality expanded perlite specifications 1.expanded perlite 2.size:4-8mm3-6mm2-4mm1-3mm 3.bulk density:80-120kgsm3 4.sio2:68-74% 5.manufacturer 1.expanded perlite size :1-3mm, 2-4mm, 3-6mm, 4-8mm, etc 2.chemicals and physical properties composition al2o3 sio2 fe2o3 cao na2o k2o mao percentage 12-16 68-74 0.1-2 0.15-1.5 4-5 1-4 0.3 item specification item specification bulk density 80-120kgsm3(as per customers demands) thermal conductivity 0.021-0.054 appearance white color , granular softening point 890-1090 c melting point 1280-1350 c vickers hardness 5.5-7 ph 6.5-7.5 water soluble .