Hair Spray

Hair spray is a common household aqueous solution that is used to keep hair stiff or in a certain style. Weaker than hair gel, hair wax, or glue, it is sprayed to hold styles for a long period. Using a pump or aerosol spray nozzle, it sprays evenly over the hair. May leave hair feeling "crunchy" unless brushed out. Hair spray was first developed and manufactured in 1948 by Chase Products Company, based in Broadview, Illinois. Its active ingredient is a suitable polymer or the chemical elastesse. Elastesse is a form of liquid elastic that keeps the hair stiff and firm without snapping.

The solvent used was once a compound of carbon, fluorine, and chlorine (a chlorofluorocarbon, or CFC). CFCs are nontoxic, nonflammable, and make almost ideal aerosol propellants. However, when it was learned that they cause destruction of stratospheric ozone, they were replaced with other solvents, like alcohols and hydrocarbons. Other polymers used in plastic-based hairsprays are copolymers with vinyl acetate and copolymers with maleic anhydride. Some hair sprays use natural polymers and solvents like vegetable gums dissolved in alcohol. One popular ingedient is gum arabic is made from the sap of certain trees that grow in the Sudan. Gum tragacanth is another herbal gum that is used to stiffen calico and crepe, as well as hair.

Excessive use or lack of washing after hair spray may lead to dull or damaged hair and dandruff. Some hair sprays are scented or have color. Hair spray is an easy way to hold hairstyles for a short period. Hair spray can be used mostly for hairstyles like the beehive and the bubble. Hair spray is extremely flammable, more so before it is dry. The result of ignition is moderate to serious burns to the hair and upper torso, sometimes resulting in death. A common movie and video game weapon is hair spray and a lighter to form a makeshift flamethrower, though in reality this is far more dangerous to the user than as a weapon because of the possibility of the flame coming back into the canister and causing an explosion.

Hairspray is a solution of long, chainlike molecules (called polymers) in a very volatile solvent. Spraying deposits a stiff layer of the polymer on your hair after the solvent evaporates. One of the polymers used is polyvinylpyrrolidine, which is also used to glue the layers of wood in plywood together. An non-water soluble polymer called polydimethylsiloxane is added to make the hold last a bit longer (the polyvinylpyrrolidine is water soluble). Other polymers used in plastic-based hairsprays are copolymers with vinyl acetate and copolymers with maleic anhydride. Some hairsprays use natural polymers and solvents like vegetable gums dissolved in alcohol. One popular ingredient is gum arabic is made from the sap of certain trees that grow in the Sudan. Gum tragacanth is another herbal gum that is used to stiffen calico and crepe, as well as hair.