Ol samting we inap long kamapim senis: Taim kwaliti bilong 'extruded polystyrene' (XPS) bod i no gutpela (olsem, ol i wokim long ol liklik woksop we ol i yusim ol samting ol i bin yusim gen) o i stap long ples we i gat hat moa long 70 digri na san i save lait oltaim, dispela inap long bagarapim 'structural stability' bilong en. Long dispela taim, ol intanel molekiul bilong dispela samting i save go insait long bikpela muvmen bikos long bikpela hat, na dispela i save mekim ol i go bikpela o liklik, na bihain dispela i save kamapim ol samting olsem 'warping' na 'denting'.
Ol situesen we i no inap long senis: Ol XPS bod we i gat gutpela kwaliti we i bihainim ol nesenel standet i save stap gut insait long nomol tempereja (-50 digri i go inap 70 digri). Wantaim helpim bilong ol samting bilong lukautim yu olsem karamapim wantaim laplap bilong sedo o putim ol 'heat insulation' leia, ol hevi bilong san i ken kamap gut. Olsem, pasin bilong ol konstraksen sait em long karamapim ol XPS bod stak wantaim ol 'tarpaulin'.
