Concrete Hollow Floor Panel 1.Sound and fire proof 2. internal & external wall.partition wall 3.1.2-1.4m/min New Designed Concrete Hollow Floor Panel Panelprefabricated concrete wall making machine Product description:1.Precast Concrete Slab Machine take cement,stone,sand, coal gangue, pumice, shale, haydite etc of one or more, add a certain proportion of ordinary cement, expanded perlite as raw ...