se cuenta hoy entre los más importantes fabricantes de pigmentos de polímeros de microperlas (beads), los que usados en pinturas y barnices logran efectos tan valiosos y especiales en diversos tipos de superficies. Con una amplia gama de más de 40 productos se pueden satisfacer hoy día todos los requerimientos de un buen “softfeel”, múltiples matices de “mate”, gran resistencia a rayaduras y marcas y otros criterios de calidad en todos sus aspectos.
http://www.microchem-online.com/sp/ueber_microchem.html?PHPS...

Polystyrene is a polymer made from the monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum.
Polystyrene's most common use, however, is as expanded polystyrene (EPS). Expanded polystyrene is produced from a mixture of about 90-95% polystyrene and 5-10% gaseous blowing agent, most commonly pentane or carbon dioxide

La forma expandida (poliestireno expandido) se utiliza como aislante térmico y acústico y es ampliamente conocido bajo diversas marcas comerciales (Poliexpan, Telgopor, etc.)

http://es.wikipedia.org/wiki/Poliestireno

The tiny spherical polystyrene beads are expanded to about 40 times their original size using a small quantity of pentane (typically 5% by weight) as a blowing agent. This process involves the heating of beads, using a flow of steam, which causes the blowing agent to boil and thus a honeycomb of closed cells is formed.

http://www.bpf.co.uk/bpfindustry/process_plastics_moulding_e...


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Note added at 1 hr (2007-02-08 01:32:24 GMT)
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Elevation Wedge Pillow
Wedge is filled with polystyrene beads and is covered in vinyl for easy care

http://www.amazon.com/Posey-Torso-Elevation-Wedge-Pillow/dp/...