Propanediol (1.3)

Propanediol (1,3) is a high-purity, fermentation-derived humectant and multifunctional solvent produced from renewable corn. Cosmetic grade and USP compliant, it helps support hydration, improve skin feel, reduce tack, and enhance the performance of cosmetic formulations. It is widely used in serums, toners, gels, lotions, cleansers and other water-based systems where a lightweight, elegant sensory profile is desired.

KEY SPECIFICATIONS

Ingredient: Propanediol (1,3)
INCI: Propanediol
CAS: 504-63-2
Solubility: Water soluble
Typical use level:
- Leave-on: 1–5%
- Rinse-off: 1–3%
- Often used to reduce tack in glycerin-based systems
Starter: 2–3% for most cosmetic formulations.

FORMULATION NOTES

Processing notes

Add to the water phase with mixing until uniform. Suitable for cold-process and heated systems.

Compatibility notes

Compatible with most cosmetic ingredients
Works well in humectant systems with glycerin or pentylene glycol
Supports even distribution of actives

pH notes

Stable across typical cosmetic pH ranges (approx. 4–8).

Formulation examples

Hydrating toner or mist

Propanediol: 2–4%
Primary humectant (e.g. glycerin): 2–3%
Actives as required
Preserved aqueous base to 100%

Improves hydration while maintaining a lightweight, low-tack skin feel.

Serum or gel system

Propanediol: 2–5%
Complementary humectants as required
Polymer thickener: as required
Neutralise and preserve appropriately

Supports hydration, improves slip, and enhances overall sensory balance.

Cream or lotion (emulsion)

Propanediol: 2–4% (water phase)
Emollients and emulsifier system as required
Preserved to finished formula

Contributes hydration and improves spreadability in face and body emulsions.

SENSORY PROFILE

Propanediol contributes a lightweight, smooth skin feel with reduced tack compared to glycerin at comparable use levels. It is commonly used to refine humectant systems, improving slip and overall sensory profile. Sensory outcome is formulation-dependent; bench testing is recommended.