A colloid consisting of gas bubbles dispersed in a liquid or solid. Liquid foams (like shaving foam) are stabilized by surfactants. Solid foams (like styrofoam) have bubbles trapped in a solid matrix. Foams have low density and are used as insulators and packaging.
Properties & Characteristics
Foam is a colloidal dispersion of gas bubbles in a liquid or solid matrix. Liquid foams (e.g., soap foam, beer foam) are stabilised by surfactants adsorbed at the gas-liquid interface, which lower surface tension and form elastic films around bubbles. Without stabiliser, films thin and rupture by Ostwald ripening and drainage. Solid foams (polyurethane foam, bread, aerogels) have gas bubbles trapped in a solid matrix.
Uses & Applications
Foams are used in fire suppression (AFFF, protein foam on aviation and petrochemical fires), food industry (whipped cream, bread, meringue), pharmaceuticals (spray foams for wound dressing), building insulation (polyurethane foam), and in chromatography media (polymer foams as sorbents).
Safety Information
Firefighting foams (AFFF) contain PFAS which are persistent environmental contaminants now subject to regulatory restrictions. Polyurethane foam combustion produces toxic isocyanates and HCN. Flammable aerosol foams are fire hazards.
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
A colloid consisting of gas bubbles dispersed in a liquid or solid. Liquid foams (like shaving foam) are stabilized by surfactants. Solid foams (like styrofoam) have bubbles trapped in a solid matrix. Foams have low density and are used as insulators and packaging.
Foams are used in fire suppression (AFFF, protein foam on aviation and petrochemical fires), food industry (whipped cream, bread, meringue), pharmaceuticals (spray foams for wound dressing), building insulation (polyurethane foam), and in chromatography media (polymer foams as sorbents).
Firefighting foams (AFFF) contain PFAS which are persistent environmental contaminants now subject to regulatory restrictions. Polyurethane foam combustion produces toxic isocyanates and HCN. Flammable aerosol foams are fire hazards.
Editorial standards: Chemical data is sourced from peer-reviewed literature,
CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA,
and IAEA. For educational purposes only — always consult official SDS documentation and qualified
professionals before handling chemicals.
