Fig. 2From: Microstructure and compressive strength of gypsum-bonded composites with papers, paperboards and Tetra Pak recycled materialsFracture types of the seven “gypsum-filling materials” combinations tested. From left to right: a office paper, newspaper, magazine paper, b testliner–kraftliner–fluting papers, paperboard, c Tetra Pak I, Tetra Pak IIBack to article page