Definitions of perfume types:

Perfume types reflect the concentration of aromatic compounds in a solvent.

Various sources differ considerably in the definitions of perfume types.

The concentration by percent/volume of perfume oil is as follows:

• Perfume extract (Extrait):15-40% (IFRA: typical 20%) aromatic compounds

• Eau de Parfum (EdP), : 10-20% (IFRA: typical ~15%) aromatic compounds.Sometimes listed as "eau de perfume" or "millésime".
• Parfum de Toilette (PdT): 10-20% (IFRA: typical ~15%) aromatic compounds
• Eau de Toilette (EdT): 5-15% (IFRA: typical ~10%) aromatic compounds
• Eau de Cologne (EdC): Chypre citrus type perfumes with 3-8% (IFRA: typical ~5%) aromatic compounds
• Splash and After shave: 1-3% aromatic compounds

 The intensity & longevity of perfume is based on the concentration, intensity and longevity of the aromatic compounds (natural essential oils / perfume oils) used.

As the percentage of aromatic compounds increases, so does the intensity and longevity of the scent created.

Different perfumeries or perfume houses assign different amounts of oils to each of their perfumes.

 Note that although the oil concentration of a perfume in Eau de Parfum (EdP) dilution will  be higher than the same perfume in Eau de Toilette (EdT) from within the same range, the actual amounts can vary between perfume houses.

Men's fragrances are rarely as EdP or perfume extracts.

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Please note: The above text was excerpted from Wikipedia.

The original source page can be found online at:

http://en.wikipedia.org/wiki/Eau_de_toilette