Paraffin
From Freepedia
- Paraffin is a common name for a group of high molecular weight alkane hydrocarbons with the general formula CnH2n+2, where n is greater than about 20, discovered by Carl Reichenbach.
- In British English, as well as most varieties of Commonwealth English, the fuel known in American English as kerosene is called paraffin oil (or just paraffin), and the solid forms of paraffin are called paraffin wax.
- Paraffin is also a technical name for an alkane in general, but in most cases it refers specifically to a linear, or normal alkane, while branched, or isoalkanes are also called isoparaffins. (Latin para+affinis with the meaning here of "lacking affinity", or "lacking reactivity")
Physical and chemical properties
It is mostly found as a white, odorless, tasteless, waxy solid, with a typical melting point between about 47°C and 65°C. It is insoluble in water, but soluble in ether, benzene, and certain esters. Paraffin is unaffected by most common chemical reagents, but burns readily.
Uses
- Candlemaking
- Coatings for waxed paper or cloth.
- Preparing specimens for histology.
- Solid propellant for hybrid rockets
- Sealing jars, cans, and bottles
- In dermatology, as an emollient (moisturiser)
- Surfing, for grip on surfboards as a component of surfwax.
- As a food additive, a glazing agent with E number E905
Food-grade paraffin wax is used in some candies to make them look shiny. Although edible, it is nondigestible; it passes right through the body without being broken down. Non-food grade paraffin wax can contain oils and other impurities which may be toxic or harmful.
Impure mixtures of mostly paraffin wax are used in wax baths for beauty and therapy purposes.
Paraffin wax is not used much to make original models for casting, as it is relatively brittle at room temperature and usually cannot be cold-carved without excessive chipping and breaking. Soft, pliable waxes such as beeswax are preferred for modelling.
Paraffin is mostly used for candle wax.
