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Cajeput oil (cajuput oil) is obtained by steam distillation of the leaves and flowers of Melaleuca cajuputi Powell (syn.Melaleuca minor Smith), an evergreen tree growing in Southeast Asia. Cajeput oil is a colorless to yellow-greenish liquid with a fresh camphoraceous odor.
d²⁰₂₀ 0.915–0.932; n²⁰_D 1.4660–1.4720; α²⁰_D ?4°to 0°; 1.8-cineole content 50–65% (data for marketable qualities).
1.8-Cineole is by far the main constituent of cajeput oil; additional components are, for example,α-terpineol and a number of monoterpene and sesquiterpene hydrocarbons. Cajeput oil is produced mainly in Indonesia in a quantity of 300 t annually. It is mainly used in the domestic market in Indonesia for refreshing notes in soaps and detergents and in pharmaceutical preparations.

The oil, obtained from the distillation of the leaves and twigs, has an agreeable, penetrating, camphoraceous odor and aromatic bitter taste. Most commercial cajeput oil comes from the tree Melaleuca leucadendron. Apart from its use as general household remedies for colds, throat irritation, pain, headache, etc., in the Far East, cajeput oil has found very little use in Europe and America.

The oil is an almost colorless, green or yellow liquid.

Extractives and their physically modified derivatives. Melaleuca leucadendron, Myrtaceae.