At a glance
- CAS number
- 81646-13-1
- INCI name
- Behentrimonium Methosulfate
- Function
- emulsifier, conditioning agent, antistatic
- Typical use level
- 0.5%–10%
- Solubility
- both
- Stable pH
- 3–7
CAS number and synonyms are sourced from PubChem. Function, usage levels, pH and compatibility are AI-assisted formulation guidance — verify against your supplier's technical data sheet and applicable regulations before use.
Also known as
BTMS Docosyltrimethylammonium Methosulfate Behentrimonium Methosulfate (and) Cetyl Alcohol Incroquat BTMS-50
Compatibility
Works well with:
Cetyl Alcohol Behenic Acid Panthenol Glycerin Silicones Polyquaternium-10
Use caution with:
Anionic surfactants Soap-based systems High concentrations of anionic polymers
As a cationic emulsifier, Behentrimonium Methosulfate is incompatible with anionic surfactants and high levels of anionic polymers, which can cause charge neutralization and destabilization of the emulsion. It pairs well with fatty alcohols such as Cetyl Alcohol or Cetearyl Alcohol to form a lamellar liquid crystal network that boosts emulsion stability and skin feel. It is widely used in hair care products alongside other cationic conditioning agents without issue.
Formulation notes
Behentrimonium Methosulfate is a mild cationic quaternary ammonium salt derived from rapeseed oil that functions as an emulsifier, conditioning agent, and antistatic in rinse-off and leave-on hair and skin products. It is particularly popular in conditioners, hair masks, and lotion bars because it imparts excellent slip, detangling, and softness while forming stable oil-in-water emulsions. It is considered gentler than some older quaternary ammonium compounds and is not associated with the same irritation concerns as Behentrimonium Chloride at equivalent use levels.
Related ingredients
- Cocamidopropyl BetaineSurfactant
- Behenyl PEG/PPG-20/20 DimethiconeEmulsifier
- Cetearyl AlcoholEmulsifier
- Cetearyl GlucosideEmulsifier
- Cetyl PEG/PPG-10/1 DimethiconeEmulsifier
- Cetyl PhosphateEmulsifier