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2,3-epoxypropyltrimoniium Chloride

2,3-Epoxypropyltrimoniium Chloride (EPTAC) is an industrial cationizing agent that creates positively charged versions of skincare ingredients like hyaluronic acid and guar gum. While not used directly in finished products, it enables the creation of cationic derivatives that adhere better to negatively charged skin surfaces through electrostatic attraction.

Directory entry · Individual source review pending

This profile is awaiting an individual source review. Treat its ratings, dose estimates and compatibility labels as provisional; they are not medical advice or proof of a finished product’s effects.

antistatic hair conditioning cationizing agent

Science

Mechanism of Action

Functions as a chemical modifier that grafts permanent positive charges onto polymers, allowing the resulting cationic ingredients to bind more effectively to the negatively charged skin surface via electrostatic forces, improving adhesion and moisturization even after rinsing

Research

Clinical Evidence

Medium confidence
Effective range 0.1–65%
Optimal

0.1%

Key findings

  1. 01 Cationic hyaluronic acid created with 0.1% EPTAC demonstrated superior skin adhesion and hydration compared to unmodified hyaluronic acid in clinical rinse-off applications
  2. 02 Dermal penetration studies at 0.1-65% concentrations showed preferential accumulation in stratum corneum with minimal systemic absorption

Transparency

Dusting Analysis

Not commonly dusted

Not applicable as this ingredient is used exclusively as a manufacturing reactant, not as a direct cosmetic ingredient

The Formula

Formulation

Solubility
Water
Optimal pH 3 – 4
0 7 14

Stability

Maintains stability in acidic conditions below pH 4; undergoes rapid reaction with nucleophiles in alkaline environments; hydrolyzes gradually in aqueous solutions over time

Synergies

  • Hyaluronic acid (creates cationic derivatives)
  • Guar gum (forms conditioning agents)
  • Starch (produces film-forming polymers)

Conflicts

  • Anionic surfactants
  • Alkaline pH environments
  • Nucleophilic compounds

Safety

Safety Profile

CIR Status
Not reviewed
Pregnancy
Caution
Sensitization risk High

Prohibited for direct use in EU cosmetics (Annex II Entry 1473) due to CMR classification; permitted only as manufacturing reactant with minimized residual levels

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Verdict

Questionable

An industrial reactant with significant safety concerns that should only be encountered as trace residuals in properly manufactured cationic derivatives.

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References

Sources

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