Diethyl Phthalate (DEP)
Odourless to Very Faint
About this material
Diethyl Phthalate is a low-odour solvent used as a practical formulation material.
Its role is to support a composition by providing a carrier for compatible fragrance ingredients, allowing evaluation and handling at a chosen working concentration.
For a perfumer, the value of a carrier lies in how it supports practical work with the chosen ingredients.
A low-odour carrier should still be assessed in context.
Changes to solvent balance can influence clarity, handling and the way a composition is evaluated; compatibility cannot be assumed to be identical for every fragrance ingredient or application.
Check the intended mixture after standing, rather than treating initial clarity as a complete stability assessment.
Scent character
Highlights from the material’s listed odour profile.
Material character
A closer lookOdour strength
Listed qualitative strength
Tenacity / substantivity
400 hours
(reference test conditions)
Listed reference conditions
Fragrance development
Formulation carrier
Molecular identity
Fragrance allergen reference
Generic regulatory reference only. This is not a supplier allergen declaration, measured composition, allergen-free claim or finished-product labelling assessment.
Raw-material reference based on recorded CAS numbers. A CAS match identifies a reference entry; it does not verify the supplied grade, composition, purity or finished-product compliance. Naturals, bases and mixtures require composition review.
European Union / Northern Ireland
No direct listed-entry CAS match in this jurisdiction’s held reference set. This does not mean the material is allergen-free. Constituents, grouped entries and natural-material composition may require further review.
Finished-cosmetic declaration thresholds: greater than 0.001% leave-on; greater than 0.01% rinse-off. Apply the current target-market rules to the actual complete formulation; no concentration is inferred here.
Commission Regulation (EU) 2023/1545 · Regulation (EU) 2023/1545 with 11 November 2025 corrigendum; checked 2026-10-26.
Held EU transition dates: placing noncompliant products on the market until 2026-07-31; making them available until 2028-07-31. Check applicability and current law for the intended market. 2025 corrigendum.
Great Britain
No direct listed-entry CAS match in this jurisdiction’s held reference set. This does not mean the material is allergen-free. Constituents, grouped entries and natural-material composition may require further review.
Finished-cosmetic declaration thresholds: greater than 0.001% leave-on; greater than 0.01% rinse-off. Apply the current target-market rules to the actual complete formulation; no concentration is inferred here.
Regulation (EC) No 1223/2009, Annex III (Great Britain) · legislation.gov.uk current text checked 2026-10-26.
Current supplier composition or allergen declarations are required to assess naturals, bases, mixtures and actual concentrations. Reference data checked 2026-10-26; bundle 2026-10-27. Supplementary private documents remain separate.
Product specification
| CAS number | 84-66-2 |
|---|---|
| Odour description (decreasing) | Odourless to Very Faint |
| Odour strength | None |
| Perfumery use | Carrier and stock-solution preparation where compatibility is established.Listed perfumery guidance; this is not an IFRA limit. |
| Substantivity | 400 hours (reference test conditions) |
| Solvent | None added |
| Flash point | 156°C |
| Physical state | Liquid |
| Physical form | Colourless, clear oily liquid |
| Synonyms | DEP; Diethyl Phthalate |
| Appearance | Clear oily liquid |
| Colour | Colourless |
| Molecular formula | C12H14O4 |
| Molecular weight | 222.24 g/mol |
Safety & handling
Not Hazardous According To EC 1272/2008
Important: For professional formulation use. Review the Safety Data Sheet before handling, storage or use.
Datasheets & customer documents
Available documents are attached to eligible completed orders in your account.
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Supplementary documents are supplied only where explicitly listed and available. Check documentation information
Purchased as a guest? Follow the SDS request guidance in our Documentation Supply Policy and provide proof of purchase.
Documentation Supply PolicyIFRA formulation guide
Generic reference only — not an IFRA certificate, compliance decision or use recommendation. The Responsible Person and qualified safety assessor must assess the actual finished formula using current applicable IFRA Standards, supplementary documentation where available and the CPSR.
Raw-material reference based on recorded CAS numbers. A CAS match identifies a reference entry; it does not verify the supplied grade, composition, purity or finished-product compliance. Naturals, bases and mixtures require composition review.
Source: 51st Amendment overview, held source checked 2026-10-21. Bundle 2026-10-27. Individual Standards prevail over the overview.
No direct IFRA overview entry matched the recorded CAS in this held dataset. This does not mean unrestricted use, absence of relevant Standards or compliance. Constituent restrictions may still apply.
IFRA source overview · Individual IFRA Standards and supplementary documentation
Supplier certificates and private documents are separate evidence. Their availability does not determine whether this generic guide is shown. This is a dated local reference, not a live regulatory feed.
Creative ideas to explore
Creative directions, not tested formulas.A clear starting point
With Diethyl Phthalate (DEP) and a known concentrateUse the listed solubility and preparation information to plan a small bench comparison with a known fragrance concentrate. Record clarity immediately and after standing; a clear sample alone does not establish compatibility or finished-product suitability.
A dilution library
Labelled samples and repeatable recordsWhere the product specification supports the intended use, organise labelled working preparations for materials you already understand. Record the actual starting strength, carrier and preparation date so later comparisons describe the same material rather than different unrecorded dilutions.
Compare the carrier
One concentrate, controlled variablesCompare this preparation with an established reference while holding the fragrance concentrate and evaluation method constant. Record clarity and any observed change in the scent impression; treat the comparison as evidence to investigate, not proof of universal compatibility.


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