Many applications of polymers for exterior elements are hidden because of the similarity with traditional materials. They more or less mimic stone, wood, painted metals…
To assume their functions during a long time without maintenance they must resist sun, rain, high and low temperatures, acid rains and other industrial pollutants needing specific grades eventually warranted for a long period. In certain countries this is required by local codes, regulations, standards
Apart transparent or flexible items, the choice of materials is somewhat limited by economic considerations and performance balance.
Polystyrene and polyurethane foams dominate the market, PVC and polyethylene foams accounting for less than 1%.
EPS used in building represents 18% of total polystyrene consumption.
All construction applications consume 26% of PUR.
Examples of applications are listed below:
* Polyurethane and polystyrene foams for heat insulation of roofs and walls.
* Foamed blocks coated with cement roughcast for external walls.
* Sandwich panels made with a foamed core.