Lightweight panel

摘要

Lightweight constructional board comprises: (A) a supporting core; and (B) two outer layers, in which the different layers are bonded together and core (A) comprises separate tubular sections fused together laterally; where: (i) the tubular sections are made up of two layers, with: (a1) the outer layer having a softening point 10-90 degrees C lower than that of: (a2) the inner layer. Also claimed is a 2-layer tube.