Tea Tree Oil Standards
The major significant chemical and physical specifications of tea tree oil are defined in the Australian Standard AS2782-1985 'Essential Oils- Oil of Melaleuca, Terpinen-4-ol Type.'
The Australian government has further tightened the Australian Standard specifications for tea tree oil to ensure that only oil of highest quality and consistent composition reaches the public.
Terpinen-4-ol is one of the major germicidal components of tea tree oil, and a high terpinen-4-ol content characterizes high quality oil of exceptional efficacy.
Although the Australian Standard defines that terpinen-4-ol content should be at least 30%m/m, the terpinen-4-ol concentration in Tea Tree Therapy, Inc. oil must be greater than 36%m/m.
1.8-cineole is a constituent of many essential oils and is the major compound in eucalyptus oil. Although the Australian Standard allows a maximum concentration of 15%m/m cineole, the cineole concentration in Tea Tree Therapy Tea Tree Oil is kept to around 3% and must never exceed 6%m/m, as 1.8 cineole is recognized as a potential skin irritant of higher concentrations.