How much Iso E Super to use in a perfume

Iso E Super is used at anything from a fraction of a percent to more than half of a concentrate, and the right figure depends on the job you give it. As a trace it smooths, as a heart support it adds volume and a skin-like radiance, and as an overdose it becomes the perfume.

What does Iso E Super smell like?

On its own, not much, which is the whole point. Iso E Super is a smooth, transparent, velvety woody-amber with a dry cedar tone and a diffusion that reads as warm skin rather than as wood. The catalog files it as woody, sub-category ambery woody, band base, with the woody families amberwood, cedar and dry leading and a warm, dry amber behind them. Its impact figure is 2 out of 10, among the quietest odorants in the catalog, and that low number is not a mistake: the material is enormous in reach and tiny in loudness at the same time.

Two more facts shape how you dose it. It is one of the materials a share of people barely register at all, so bench it on more than one nose before you judge a level. And it stays on a strip for days, so whatever you decide is a decision about the drydown, not just the opening.

How much Iso E Super goes in a perfume?

There are three honest answers, one per role. The figures are shares of the concentrate, before alcohol.

• A trace, under 1%. Here it is a blender. It rounds off sharp corners between a citrus top and a woody base and gives a formula a finished, slightly expensive feel without adding a note anyone can name.
• A heart support, roughly 5 to 15%. This is the everyday dose. It carries the volume of a woody, floral or fougere heart, extends the middle hours, and gives the perfume the radius that makes people ask what you are wearing.
• An overdose, 20% and beyond. Here Iso E Super is the idea, and the other materials are shading it. There are commercial perfumes that are very nearly nothing else. At this level the perfume reads as one abstract, clean, cedar-and-skin haze, and the wearer often stops smelling it within the hour while everyone else still can.

The catalog carries a working dilution of 10% for it, the bench convention for a material of its strength, though most perfumers weigh it neat because the doses are large.

What does Iso E Super do to projection?

Raising the dose makes the perfume bigger, not louder. Iso E Super has a low impact and a very high diffusion, so it widens the cloud around the wearer and lengthens the hours without ever turning into a loud note. That is why it is the classic answer to "my perfume is fine on the strip but disappears on skin": it does not add a smell, it adds reach.

The trap is adaptation. Your own nose goes blind to it quickly, so a dose that felt right on day one can feel like nothing on day three, and the temptation is to keep adding. Judge it on other people and on a dated strip, not on your own wrist.

Is Iso E Super restricted by IFRA?

Restricted, not banned. In the IFRA 51st Amendment dataset PerfuMate ships, the OTNE standard (the chemical name behind Iso E Super and its sister isomer grades) sets a Category 4 cap of 20% of the finished product, fine fragrance on skin. The cap applies to what lands on skin, not to the concentrate: at a 20% perfume concentration, even a concentrate that was entirely Iso E Super would sit exactly at the line, and a 30% overdose lands at 6% of the finished product. In practice the standard only bites at extreme overdoses in strong concentrations. It carries no EU ban.

Is Timbersilk the same as Iso E Super?

No, and neither is Sylvamber, although all three share a CAS number. They are OTNE woods cut to different isomer ratios: Timbersilk is drier, sanded plank rather than fresh sawdust, and takes double-digit percentages; Sylvamber leans mineral. Same family, different ratio, different smell, so none of them is a drop-in for the others. Asked for a stand-in, the substitutes engine ranks Bornafix first for Iso E Super at 92 and says why the meter stops short of 100: the catalog cannot tell the two apart by their notes, so smell them side by side.

A worked example: a transparent woody base

For 100 g of concentrate: Iso E Super 25 g, Hedione 15 g, Ambroxan 1 g, Vetiver Essential Oil 3 g, Bergamot FCF Essential Oil 8 g, and the rest of the formula on top. Iso E Super at 25% is an overdose dose doing a heart support's job, because Hedione and the vetiver shade it enough that it never reads as one molecule. Bottled at 20%, it lands at 5% of the finished product, a quarter of the OTNE cap. Cut it to 8 g and the same base becomes a support for a floral heart; cut it to 0.5 g and it is a blender you will not hear but will miss if you take it out.

On the bench, PerfuMate corrects every Iso E Super line for the dilution it is weighed from, checks the OTNE total against the 51st Amendment Category 4 cap live as you type, and ranks what on your own shelf can stand in for it when the bottle runs out. The AI that builds and refines formulas is handed the catalog and your shelf on every run, never trained on either. See how the bench works, or run the IFRA check on a formula now.