Santol Pentenol is the chemical name of the compound with CAS No. 107898-54-4, best known worldwide under the trade name Polysantol, developed by Firmenich. It is a fully synthetic ingredient and represents a major breakthrough in aroma chemical development, enabling perfumers to create a sandalwood note that is not only exceptionally long-lasting but also remarkably powerful in diffusion. In appearance, it is a relatively viscous liquid, ranging from clear to pale yellow, with a rich, highly natural sandalwood odor accompanied by a subtle creamy, milky nuance.
Today, this material is widely used to add warmth and depth to products ranging from fine fragrances to body-care formulations. Historically, the compound was discovered and patented by Firmenich scientists during the second half of the 1980s. Because it was developed relatively late, Polysantol does not appear in Steffen Arctander’s classic reference work Perfume and Flavor Chemicals, Volumes 1 and 2, published in 1969, as the material had not yet been invented when the book was released.
Description
Belonging to the woody olfactory family, Polysantol functions primarily as a base note, an excellent fixative, and a modifying material that lends smoothness to the overall fragrance composition. Unlike earlier generations of sandalwood molecules, which often remain relatively close to the skin, Polysantol convincingly recreates the rich character of Indian sandalwood heartwood while offering exceptionally strong spatial diffusion.
The material has very high odor intensity and outstanding substantivity, remaining detectable on a smelling strip for several weeks. In fragrance compositions, Santol Pentenol is used to build a strong woody framework, soften sharp or angular notes, and impart a rounded, radiant quality to the structure.
One particularly effective technical combination is to blend it with Iso E Super, polycyclic musks, and Sandela, creating a multidimensional sandalwood accord that combines powerful diffusion with a solid and persistent base.
Because Santol Pentenol is viscous and highly odor-active, perfumers commonly dilute it in suitable solvents such as Dipropylene Glycol (DPG) or Triethyl Citrate (TEC) at concentrations of 10% or 50% to facilitate weighing, dosing, and handling.
Applications
Thanks to its ability to create a rich, creamy woody effect with excellent diffusion, Polysantol has a broad range of applications, including fine fragrance, home fragrance, leave-on cosmetics, rinse-off cosmetics, and soaps.
According to standards established by the International Fragrance Association (IFRA), the material has a favorable safety profile and is not subject to particularly stringent toxicological use restrictions, with typical reference usage levels generally ranging from 0.1% to 5%, depending on the structure and intended character of the finished product.
From a safety perspective, the compound is not considered phototoxic and is not included among the fragrance allergens that are mandatorily required to be individually declared on product labels. Standard handling precautions should nevertheless be observed: the material should be stored in a cool, well-ventilated place, and direct contact of the undiluted material with the eyes should be avoided.
In modern perfumery, Polysantol has become a historically significant and iconic ingredient. It contributed directly to the success of Guerlain’s classic fragrance Samsara, launched in 1989. In that composition, perfumer Jean-Paul Guerlain used a substantial amount of Polysantol together with natural sandalwood oil to create an intensely rich, creamy, sensual, and enduring sandalwood signature.
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