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BEHENTRIMONIUM METHOSULFATE.

Valuable CAS 81646-13-1 / 241148-21-0 / ANTISTATIC, HAIR CONDITIONING, SURFACTANT - CLEANSING

A sophisticated, plant-derived cationic emulsifier and conditioning agent renowned for its exceptional mildness. Unlike harsh sulfates, it delivers a luxurious, silky finish to both skin and hair by creating a breathable protective barrier.

Emulsifying Skin conditioning Antistatic Texture enhancer

Science

Utilizing its positive ionic charge, the molecule adsorbs onto the naturally negative surface of the skin. This creates an ultra-fine, non-occlusive film that smooths the stratum corneum, reduces surface friction, and limits transepidermal water loss (TEWL) without a greasy after-feel.


Research

High confidence
Effective range 0.5–5%
Optimal

3%

Key findings

  1. 01 Human occlusive patch testing (1-5%) confirmed no evidence of allergic contact dermatitis or cumulative irritation, even on compromised skin barriers.
  2. 02 Comparative safety assessments identify it as significantly milder than traditional quaternary ammonium compounds for sensitive scalp and skin applications.

Transparency

Not commonly dusted
Min. effective
0.5%
Red flag below
0.1%

Because it functions as a primary emulsifier and texture enhancer, it is typically used at functional levels (1-3%) to maintain formula stability. Concentrations below 0.5% in leave-on products may indicate use for marketing rather than structural performance.


The Formula

Solubility
Both
Optimal pH 3.5 – 7
0 7 14

Stability

Heat stable up to 100°C; optimally integrated into the oil phase at 75-80°C. It serves as a high-performance primary emulsifier.

Synergies

  • Cetearyl Alcohol
  • Non-ionic surfactants
  • Silicone alternatives

Conflicts

  • Anionic surfactants (SLS/SLES)
  • Carbomer (anionic thickeners)
  • High concentrations of Hyaluronic Acid (may cause complexing/clumping)

Safety

CIR Status
Safe as used
Max tested
3%
Pregnancy
Safe
Sensitization risk Low

SCCS limits use to 3.0% in leave-on facial and hair products. It is recognized for its safety on atopic and xerotic (extremely dry) skin.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

A premier, non-irritating conditioning agent that provides a superior skin-feel and barrier support for all skin types.


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