All polyurethane foams are composed of petrochemicals. These materials were also used to produce rigid foams, gum rubber, and elastomers. Synthetic foams are based on synthetic surfactants. Like other tertiary amines, it catalyzes the formation of urethane foams and epoxy resins. Foam-in-place is another method of using polyurethane foams. It is used in the production of flexible polyurethane foams. MDI is a precursor to many polyurethane foams. In 1960 more than 45,000 metric tons of flexible polyurethane foams were produced. BASF's plastic products include high-performance materials in thermoplastics, foams, and urethanes. Additionally, gels, foams, and compressed gases, including nitrogen, carbon dioxide and air can be injected. Temporary hair color is available in various forms including rinses, shampoos, gels, sprays, and foams. It can also improve the stability of foams and emulsions. The composite applications may be for use as coatings and films, paints, foams, packaging. It works on any concentrated dispersions without dilution, including foams. Polystyrene foams are 95-98% air.