2.4.1 Sandwich Panels Line (4) 2.4.1 Sandwich Panels Line (1) 2.4.1 Sandwich Panels Line (3) 1 / 3 General Introduction The insulation panel core material can be EPS, PU, PIR or rockwool, and two sides can be PPGI, aluminium foil or kraft paper. The products are widely used in building roof & wall, cold storage,...