Standing on the steps of Sydney's town hall, Eddie Meng waves his mortar board as some of his fellow Chinese students take pictures of him before his graduation ceremony.

In front of Nanjing University's ivy-clad tower, a graduate poses for a photograph in his gown, mortar board and Reeboks.

Concrete foam insulation board is porous material, cement, mortar, wall and homogeneous, good interface, simple cleaning paste it directly, and viscous solid.