✦ Warm, spicy, clove-like aroma chemical with soft floral and woody undertones — a cornerstone of oriental and carnation accords
✦ Derived by isomerization of eugenol — naturally occurring in ylang ylang, nutmeg, and clove oils
✦ Excellent fixative and base modifier that extends the longevity of spicy and floral compositions
✦ Widely used in classic perfumes, attars, agarbatti, soaps, and functional fragrance products
✦ Subject to IFRA 51st Amendment restrictions — use within regulated limits in leave-on skin applications
✦ Vegan and not tested on animals — suitable for vegan formulations within IFRA compliance
✦ Cosmetic-grade purity — suitable for fine fragrance, attar blending, soap making, and home fragrance

IsoEugenol is a naturally occurring phenylpropanoid aromatic compound found in the essential oils of ylang ylang, clove, nutmeg, and several spice plants. Chemically it is the isomeric form of eugenol, distinguished by the position of its double bond on the propenyl chain. First isolated in the late 19th century, it became a standard fragrance material in the early 20th century when perfumers discovered its superior tenacity and softer character compared to eugenol itself. It has appeared in countless classic oriental and floral fragrances across a century of perfumery.

What makes IsoEugenol particularly valuable is its dual character — it reads simultaneously as spicy, clove-like, and softly floral with a warm woody drydown. This quality allows it to function as both a spice note in the heart of a composition and as a subtle fixative in the base. It blends seamlessly with rose, jasmine, sandalwood, vetiver, and musks, anchoring lighter notes and adding depth and complexity. In attar and oriental perfumery, it is indispensable for creating the warm, enveloping quality that defines the genre.

Bio Shop Pakistan supplies cosmetic-grade IsoEugenol suitable for professional perfumers, attar formulators, soap makers, home fragrance crafters, and cosmetic ingredient developers working across Pakistan and the region.

SCENT DESCRIPTION : IsoEugenol opens with a sharp, medicinal clove spice that quickly softens into a warm, creamy floral warmth. The mid-character reveals a carnation-like quality with a hint of sweet woodiness underneath. As it dries down, it settles into a smooth, long-lasting spicy-woody base with subtle incense depth. It is less harsh than eugenol and carries a rounder, more diffusive quality on skin.

NOTE POSITION : Mid-Base

FRAGRANCE FAMILY : Oriental / Spicy / Floral

FACETS : Clove · Warm · Carnation · Woody · Spicy-Sweet

TENACITY : High — 12 to 18 hours on blotter, 8 to 12 hours on skin

SILLAGE : Medium — projects moderately close to skin, excellent in blends where it boosts overall longevity without dominating the sillage

Chemical Name : 2-Methoxy-4-(1-propenyl)phenol
CAS Number : 97-54-1 (mixed isomers); trans-isomer: 5932-68-3
Synonyms : Isoeugenol; Methoxy propenyl phenol; 4-Propenylguaiacol; p-Isoeugenol
Purity : 98% minimum (cosmetic grade)
Appearance : Colorless to pale yellow clear liquid
Odor Threshold : Approximately 0.006 ppm (very low — highly detectable at trace levels)
Solubility : Soluble in ethanol, fixed oils, and most fragrance carriers; practically insoluble in water
Specific Gravity : 1.079 – 1.085 at 20°C
Flash Point : Approximately 128 – 132°C (closed cup)
Type : Semi-synthetic (produced by isomerization of natural eugenol)

Fine Fragrance : ★★★★★
IsoEugenol is a classic fine fragrance material appearing in oriental, chypre, and floral compositions for over a century. It adds clove spice warmth and acts as a fixative for volatile top notes. Use within IFRA Category 4 limit of 0.02% in leave-on fine fragrance formulations.

Attar & Oriental Blending : ★★★★★
This material is essential in attar making and traditional oriental perfumery. It pairs beautifully with rose otto, oud, sandalwood, and musky bases, delivering the characteristic warm, incense-like depth of classical South Asian and Middle Eastern fragrances. Highly recommended for this application.

Functional Fragrance : ★★★★
IsoEugenol performs well in soaps, detergents, and fabric care products where its warmth adds character to spicy or floral accords. Rinse-off and non-skin-contact applications allow higher usage rates compared to leave-on products.

Cosmetics : ★★★
Usable in skin-safe concentrations but subject to strict IFRA limits due to sensitization potential. Best suited for rinse-off cosmetics such as shower gels and soaps. Caution required in face and body leave-on products — must stay within regulated percentages.

Home Fragrance : ★★★★★
Excellent performance in candles, reed diffusers, and incense sticks where IFRA skin-contact restrictions do not apply. Delivers rich oriental warmth and excellent throw in candle wax and diffuser bases. Widely used in agarbatti and bakhoor formulations.

RECOMMENDED USAGE RATES

Application : Typical Use Rate
EDP : Up to 0.02%
EDT : Up to 0.02%
Body Lotion : Up to 0.1%
Shampoo/Body Wash : Up to 0.02%
Candle : 0.5 – 1.0%
Reed Diffuser : 1.0 – 3.0% in blend
Soap (rinse-off) : Up to 0.5%

IFRA 51ST AMENDMENT LIMITS (Key Categories)

IFRA Category 1 (Lip products) : 0.01%
IFRA Category 2 (Deodorant/antiperspirant): 0.02%
IFRA Category 3 (Eye area) : 0.02%
IFRA Category 4 (Fine fragrance) : 0.02%
IFRA Category 5A (Body lotion/cream) : 0.10%
IFRA Category 5C (Hand cream) : 0.10%
IFRA Category 5D (Baby products) : 0.01%
IFRA Category 7A (Rinse-off hair) : 0.02%
IFRA Category 9 (Rinse-off body wash) : 0.10%
IFRA Category 10A (Household/detergent) : 0.50%
IFRA Category 11A (Candles/incense) : 1.0%

⚠️ IsoEugenol is a recognized skin sensitizer and is classified as a restricted fragrance allergen under EU Cosmetics Regulation and IFRA guidelines. Always calculate final concentration in finished product, not in fragrance concentrate.
⚠️ At concentrations above IFRA limits in leave-on products, risk of allergic contact dermatitis increases significantly. Do not exceed stated limits.
⚠️ Must be declared on EU/UK cosmetic labels if present above 0.001% (rinse-off) or 0.001% (leave-on) in finished product.

METHOD 1 — DIRECT ADDITION IN ALCOHOL BASE
Dissolve IsoEugenol directly in perfumer's alcohol (IPM or ethanol 95%) at your calculated concentration. Because its usage rate in fine fragrance is very low (max 0.02%), pre-dilute in ethanol at 10% concentration for easier accurate dosing at the bench. This avoids overdosing errors.

METHOD 2 — ATTAR AND CARRIER OIL BLENDING
In attar or oil-based perfumes, IsoEugenol blends readily with fixed oils and fractionated coconut oil. Combine with sandalwood base first, then layer rose, oud, or musk accords on top. Its warmth anchors the entire composition and rounds off sharp synthetic notes.

METHOD 3 — SOAP AND HOME FRAGRANCE APPLICATIONS
For soap and candle use, add IsoEugenol to your fragrance premix before incorporating into base. It is heat stable up to its flash point, making it suitable for hot-process soap and candle pouring temperatures. In candles, use in combination with woody and resinous materials for full oriental compositions.

BEST PAIRINGS

Rose Absolute/Rose Otto : Creates a classic carnation-rose accord; soft, romantic, and deeply oriental
Oud/Agarwood Oil : Amplifies the resinous, incense-like depth; essential pairing in attar work
Sandalwood (Mysore/Synthetic): Adds a creamy, smooth base that rounds and softens the clove edge
Ylang Ylang : Natural harmony since both share IsoEugenol in their chemistry; rich floral
Vetiver : Earthy-smoky contrast that grounds the spice and adds sophistication
Benzyl Benzoate : Excellent diluent and synergistic carrier that extends diffusion
Amyl Eugenol : Shares spicy clove family; layering creates complex, multi-faceted spice accord
Musk Ketone / Habanolide : Soft musk base lifts the clove character and adds modern longevity

AVOID
Avoid combining at high concentrations with other strong sensitizers such as cinnamaldehyde or hydroxycitronellal, as combined sensitization risk in leave-on products compounds significantly.

I find IsoEugenol to be one of those quietly indispensable materials that does not seek the spotlight but holds an entire composition together from within. In attar work especially, I rely on it to deliver the rounded, warm weight that distinguishes a serious oriental from a thin, one-dimensional spice accord. Its clove character is never harsh at correct usage rates — it reads more as warmth than as spice, and that distinction matters enormously in blending. The way it interacts with rose and sandalwood is almost chemical poetry, each material amplifying the best qualities of the others.

ADVANCED TIP : Because IsoEugenol has an extremely low odor threshold (around 0.006 ppm), you will perceive it strongly even at trace levels during blending. Do not be tempted to dose by smell alone — always work by weight from your formula. Pre-dilute to a 1% or 5% solution in IPM (isopropyl myristate) or perfumer's alcohol and use that solution for your weighing. This gives you working precision and prevents the common error of over-dosing, which will both breach IFRA limits and create a harsh clove note that overwhelms all other materials in the composition.

Physical State : Liquid at room temperature; may become viscous in cold conditions
Skin Safety : Known sensitizer — use within IFRA limits; conduct patch test; avoid undiluted skin contact
Eye Contact : Irritant — avoid contact with eyes; if contact occurs rinse immediately with water for 15 minutes and seek medical advice
Ingestion : Not for consumption; keep away from food, beverages, and children
Ventilation : Use in well-ventilated workspace; avoid prolonged inhalation of vapors especially at elevated temperatures
Storage : Store in tightly sealed amber glass or HDPE container away from heat, light, and moisture; ideal temperature 15 – 25°C
Shelf Life : 24 – 36 months when stored correctly in sealed container away from air exposure
Container : Amber glass preferred; HDPE acceptable; avoid PET and PVC contact for extended storage
Flammability : Combustible liquid — flash point approximately 130°C; keep away from open flame during candle and soap making

Q: What does IsoEugenol smell like and how is it different from eugenol?
A: IsoEugenol has a warm, clove-spicy aroma with a soft floral and slightly woody character. Compared to eugenol, it is smoother, less medicinal, and more rounded, making it easier to blend in finished fragrance compositions.

Q: Is IsoEugenol safe to use in skin-care products and perfumes?
A: Yes, but only within IFRA-regulated limits. It is a recognized skin sensitizer, so leave-on products like EDP and body lotions must stay at or below 0.02% and 0.1% respectively in the finished product. Always calculate concentration in the final formulation.

Q: Can I use IsoEugenol in candles and incense at higher rates?
A: Yes. In non-skin-contact applications like candles and incense, IFRA allows up to 1.0%, giving you more flexibility. It performs excellently in these applications, adding warm oriental depth and good scent throw.

Q: How do I dose IsoEugenol accurately given its very low odor threshold?
A: Pre-dilute to a 1% or 5% working solution in perfumer's alcohol or IPM and weigh by mass using a precision scale. Never dose by nose alone as you will over-estimate what is needed due to its intense odor at trace levels.

Q: How does IsoEugenol compare to eugenol for fragrance blending?
A: IsoEugenol is generally preferred in finished fragrance over eugenol because it has softer, less aggressive character, better longevity, and lower IFRA allergen declaration thresholds in some categories. Eugenol is sharper and more dental-medicinal. For attar and oriental perfumery, IsoEugenol typically produces more elegant, wearable results in the final accord.