Fixative (perfumery) A fixative is used to equalize the vapor pressures , and thus the volatilities , of the raw materials in a perfume oil, as well as to increase the tenacity. Natural fixatives are resinoids ( benzoin , labdanum , myrrh , olibanum , storax , tolu balsam ) and animal products ( ambergris , castoreum , musk , and civet ). Synthetic fixatives include substances of low volatility ( diphenylmethane , cyclopentadecanolide , ambroxide , benzyl salicylate ) and virtually odorless solvents with very low vapor pressures ( benzyl benzoate , diethyl phthalate , triethyl citrate ).
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