Polyethylene low density (CAS 9002-88-4) — Citrus N/A Note Fragrance Ingredient
Polyethylene low density
CAS 9002-88-4
What Is Polyethylene low density?
Polyethylene low density (LDPE) is a synthetic polymer commonly used in plastic packaging, bottles, and films. In fragrances, it serves as a carrier material for encapsulation systems rather than contributing scent. While consumers encounter LDPE daily in household products, its role in perfumery is purely functional—helping control fragrance release rates in time-release technologies.
Safety Profile
GENERALLY SAFEWhat Does Polyethylene low density Smell Like?
LDPE itself is odorless and tasteless, serving as an inert matrix in fragrance applications. When used in encapsulation, it gradually releases entrapped aroma compounds without imparting any olfactory characteristics. The polymer’s waxy texture and chemical inertness make it ideal for preserving fragrance integrity during controlled release.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
LDPE microcapsules are widely used in fabric conditioners and long-lasting air fresheners to provide sustained fragrance release. The polymer’s stability allows fragrance oils to remain protected until activated by friction or moisture.
Chemistry, Properties & Perfumer Guide
The Chemistry
Low-density polyethylene is a thermoplastic made from ethylene monomer polymerization under high pressure. Its branched molecular structure creates a less dense material compared to HDPE. In perfumery, LDPE’s semi-crystalline nature provides optimal barrier properties for fragrance encapsulation while maintaining flexibility for various delivery systems.
Physical & Chemical Properties
| Melting Point | 105-115 °C |
|---|---|
| Density | 0.910-0.940 g/cm³ |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Encapsulation Systems | 10-30% | 5-50% | Matrix material for fragrance microcapsules |
Classic Accords
Tip: Select LDPE grade based on desired melting point and capsule wall permeability for controlled release applications.
Alternatives & Comparisons
HDPE offers higher barrier properties but requires different processing temperatures. Use when greater capsule rigidity is needed.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not restricted – classified as processing aid rather than fragrance ingredient
RIFM Assessment
Not evaluated by RIFM – considered non-volatile carrier material
Sustainability
LDPE is derived from fossil fuels but can be recycled. Emerging bio-based polyethylene alternatives from sugarcane ethanol offer more sustainable options for encapsulation systems while maintaining identical technical performance.
Explore Polyethylene low density
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References
- PlasticsEurope (2021). Polyethylene (PE) – Technical Properties. Industry Technical Guide
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 9002-88-4Physical data: PubChem (NIH/NLM), U.S. EPA CompTox Dashboard, EPA OPERA models, RDKit. Odor & flavor: Arctander (Perfume & Flavor Chemicals), Fenaroli's Handbook of Flavor Ingredients, Leffingwell. Thresholds: van Gemert (Compilations of Odour Threshold Values). Regulatory: IFRA Standards 51st, FEMA GRAS. Trade names: Surburg (Common Fragrance & Flavor Materials). All data compiled and cross-referenced for perfumertools.com.
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