Iso E Super vs Ambroxan (and Hedione, Galaxolide): what is the difference?

By Omer Siton, founder of PerfuMate · Updated 2026-10-06

Iso E Super is a quiet, transparent woody amber; Ambroxan a loud, radiant ambergris; Hedione a transparent jasmine for the heart; Galaxolide a sweet, clean white musk. They are often used together because they do different jobs, and the catalog's own figures show how different they are: 2, 7, 2 and 3 out of 10 on its strength scale, and about 12, 17, 3 and 4 days on a blotter.

Strength and blotter figures are the catalog's sourced estimates; blotter days say how long a material stays readable on paper, not on skin. Each material has its page: Iso E Super, Ambroxan, Hedione, Galaxolide.

Iso E Super vs Ambroxan: what is the difference?

Both are long-lasting base materials that the catalog files under amber and woody, but Ambroxan is the loud one, 7 out of 10 against 2, and it smells of ambergris: dry, mineral, faintly salty and sweet, with a labdanum warmth. Iso E Super is a velvety haze of cedar and skin that you notice more by its absence than by its presence.

That difference sets the doses. Iso E Super runs from a trace to more than 20% of a concentrate (how much Iso E Super); Ambroxan mostly from a trace to about 10% (how much Ambroxan). On a blotter Ambroxan lasts longer, about 17 days against 12. Iso E Super falls under IFRA's OTNE standard, at most 20% of a finished fine fragrance; Ambroxan reaches no Category 4 limit.

Can you mix them? Yes, and perfumers often do. Three of PerfuMate's published house accords use both: the Ambergris Accord, the Sea Breeze Accord and the Skin Musk Accord. Across the published formulas that share them, the pair page puts the median at about 6 parts Iso E Super to 4 parts Ambroxan. Cetalox, often compared with both, is an ambroxide-type ambergris, drier and less sweet than Ambroxan.

Iso E Super vs Hedione: what is the difference?

They share no olfactive family: Hedione is a jasmine-floral heart material and Iso E Super a woody-amber base. What they share is a way of working. Both are quiet, 2 out of 10, both are used in large amounts, and both add an effect more than a note: Hedione lift, space and bloom, Iso E Super volume, reach and a skin-like warmth.

Hedione leaves a blotter after about 3 days and Iso E Super after about 12, so Hedione shapes the opening and the heart and Iso E Super the long middle and the drydown. They appear together in eight of PerfuMate's house accords; the Grojsman Accord gives them 28.6% each, and the pair page puts the median across published formulas at about 6 parts Hedione to 4 parts Iso E Super. Hedione HC, the high-cis grade, is more radiant and is used the same way at lower doses.

Iso E Super vs Galaxolide: what is the difference?

Iso E Super is a woody amber, not a musk: the catalog files it as woody and amber, while Galaxolide is the classic clean "white musk", sweet and powdery with a laundered softness. Both are diffusive and used generously, and they often meet in musk and floral bases: the White Musk Accord uses both, and so does the Grojsman Accord.

Two practical differences. Galaxolide is usually sold at 50% in isopropyl myristate or benzyl benzoate, so 10 g from the bottle is 5 g of musk, and if the solvent is benzyl benzoate it brings an IFRA-restricted, label-declarable material of its own (benzyl benzoate and IFRA). And Galaxolide leaves a blotter after about 4 days, Iso E Super after about 12. In the EU both must be named on the label above 0.001% of a leave-on product, as Hexamethylindanopyran and Tetramethyl acetyloctahydronaphthalenes; since 31 July 2026 products placed on the EU market must comply, and products already on the market may be sold until 31 July 2028. Many people miss one musk or another, so pair Galaxolide with a second musk of different chemistry (how to use musks in a perfume formula).

How do Hedione and Ambroxan work together in a perfume?

At opposite ends of the perfume: Hedione adds air and bloom to the heart and is gone from a blotter in about 3 days, while Ambroxan, a loud base material, carries the drydown and is still there after about 17. The usual mistake is to dose them alike: Hedione is often used at a tenth of a concentrate or more, Ambroxan mostly below that, and from a 10% solution.

None of PerfuMate's published house accords pairs the two, so there is no house ratio to quote. The worked base below starts from an accord built on Hedione and adds Ambroxan in one small, weighed step, which is the honest way to find your own ratio.

Which should a beginner buy first?

Hedione and Iso E Super. Both are quiet and forgiving, both are dosed in amounts large enough to weigh on a 0.01 g scale without a dilution, and between them they appear in more of PerfuMate's published house accords than the other two: Hedione in about half of them, Iso E Super in about one in five. Add Ambroxan when you want a long, radiant base, weighed from a 10% solution, and Galaxolide or another clean musk when you start building musks, paired with a second musk. The first formula on how to make perfume at home uses three of the four.

How do I make a base that uses them together?

Start from PerfuMate's published Grojsman Accord and adjust it by smell: for 100 g, weigh Iso E Super 25 g, Hedione 25 g, Galaxolide 50% 25 g (12.5 g of musk) and Alpha-Isomethyl Ionone 25 g. That is four aroma chemicals and nothing else, with Iso E Super and Hedione at 28.6% each of the aromatic material.

Pasted into the IFRA calculator at 18%, the base as weighed making up 18% of the perfume, Iso E Super lands at 4.5% of the finished perfume against its 20% cap, and the methyl ionone at 4.5% against its 30% cap: inside both. In the EU the bottle would name three allergens, alpha-Isomethyl ionone, Hexamethylindanopyran and Tetramethyl acetyloctahydronaphthalenes, and a fourth, Benzyl benzoate, if the Galaxolide came diluted in benzyl benzoate.

To hear what Ambroxan adds, make the base twice in 10 g batches and add 0.2 g of a 10% Ambroxan solution to the second. Smell both on strips at one hour, four hours and the next morning. The calculator keeps the second version inside every Category 4 limit too. These IFRA figures are a calculated reference check from indicative data, not a safety assessment.

Every material named here has a catalog page with its strength, blotter life and the published formulas that use it, and each pair has a page with their shared formulas and median ratio. To check a base of your own, paste it into the free IFRA calculator, which sums every restricted molecule across the formula, the OTNE in Iso E Super included.

Sources: Regulation (EU) 2023/1545 (Annex III entries 336 and 344, and the transition dates); IFRA Standards OTNE and Methyl ionone, mixed isomers (Category 4), as applied in PerfuMate's IFRA data; IFRA Standards Library.