• High-purity, fragrance-grade solvent with no odor
• Used to dilute perfume oils, attars, and concentrated aroma chemicals
• Improves fragrance performance and helps maintain consistency
• Ideal for oil-based perfumes, roll-ons, incense pastes, and solid perfumes
• Compatible with essential oils, aroma chemicals, and synthetic bases

DEP (Diethyl Phthalate) is a clear, odorless, oil-soluble solvent widely used in perfumery and cosmetics as a diluent, carrier, and fixative. Its primary role is to help dissolve and stabilize fragrance oils, improve fragrance diffusion, and act as a non-volatile base that enhances the longevity of perfumes and attars.

DEP is especially popular in alcohol-free roll-ons, incense pastes, bakhoor, and attars, as it blends well with essential oils and aromatic compounds without altering their scent profile. It’s a reliable solvent used for professional perfume making and large-scale compounding.

INCI Name: Diethyl Phthalate (DEP)

CAS Number: 84-66-2

Molecular Formula: C12H14O4

Appearance: Clear, colorless, oily liquid

Odor Description: Odorless (neutral)

Purity: 99.5%+ (fragrance grade)

Boiling Point: ~298°C

Flash Point: ~154°C

Density: ~1.12 g/cm³

Solubility: Soluble in alcohol and oils; insoluble in water

Recommended Usage Level: 10%–90% depending on formulation

Category: Solvent/Carrier – Base/Fixative – Perfumery Use

Use 15–40% in oil perfumes and up to 90% in incense oils or diluted fragrance oils for room fresheners or bakhoor pastes.

💡 To create long-lasting and stable perfume oils 🔄🧴, use DEP as your base solvent when blending essential oils or aroma chemicals.

💡 Add 10–30% DEP to reduce viscosity and enhance diffusion in roll-ons.

💨 Use up to 90% DEP in home fragrance oils or bakhoor perfume pastes.

🌫️ Ideal for blending heavy fixatives like musk ambrette, coumarin, or resins without cloudiness.

⚗️ Always blend slowly and allow the mixture to sit for a few days to fully stabilize.

⚠️ Although generally safe for topical use, avoid overuse in leave-on skin products without patch testing.

Q1: What is DEP used for in perfumery?

It’s a carrier solvent used to dilute and stabilize perfumes, making them easier to apply, longer lasting, and more diffusive.

Q2: Does DEP have any smell?

No. DEP is completely odorless, which makes it ideal for use in perfumes—it won't interfere with the fragrance profile.

Q3: Can I use DEP in oil-based perfumes or attars?

Yes. DEP is perfect for oil perfumes, roll-ons, incense oils, and even solid perfume formulations.

Q4: Is DEP safe on skin?

Yes, in cosmetic-grade concentrations. However, it should always be used responsibly and ideally followed by a patch test.

Q5: What does DEP blend with?

It’s compatible with almost all essential oils, aroma chemicals, fixatives, and synthetic perfume compounds.