Styrofoam vs. Polystyrene

Styrofoamnoun

Expanded polystyrene foam, such as is used in cups and packaging.

Styrofoamnoun

a light resilient foam of polystyrene

Styrofoam

Styrofoam is a trademarked brand of closed-cell extruded polystyrene foam (XPS), commonly called , manufactured as foam continuous building insulation board used in walls, roofs, and foundations as thermal insulation and water barrier. This material is light blue in color and is owned and manufactured by The Dow Chemical Company.Styrofoam is colloquially used worldwide to refer to another material that is usually white in color and made of expanded (not extruded) polystyrene foam (EPS).

Polystyrenenoun

(organic chemistry) A vinylic polymer of styrene, CH2CHphenyl.

Polystyrenenoun

(organic chemistry) An alkane chain of benzene molecules, RCH2CHphenylR.

Polystyrenenoun

a polymer of styrene; a rigid transparent thermoplastic;

Polystyrene

Polystyrene (PS) is a synthetic aromatic hydrocarbon polymer made from the monomer known as styrene. Polystyrene can be solid or foamed.