
THE STORY OF BEHENTRIMONIUM METHOSULFATE
BTMS: The Gentle, Premium Conditioning Emulsifier
Behentrimonium Methosulfate (BTMS) is a cationic conditioning emulsifier known for its mildness, luxurious slip, and velvety after-feel on hair and skin. Unlike harsher quats, BTMS is exceptionally gentle, making it the preferred conditioning agent for premium hair masks, leave-in creams, and skin lotions.
Plant-Derived Conditioning Active from Rapeseed Oil
BTMS is produced by reacting behenyl fatty acid (from rapeseed oil) with methosulfate to form a mild, hair-compatible quaternary ammonium compound. TRCkem supplies BTMS-25 and BTMS-50 grades, standardized for high purity, low odor, and predictable melting behavior in emulsions.
Silky Slip. Deep Conditioning. Lightweight Feel.
Behentrimonium Methosulfate offers multiple benefits:
✅ Superior detangling & comb-through slip
✅ Reduces frizz, static, and breakage
✅ Lightweight conditioning — no buildup
✅ Adds softness to both hair & skin emulsions
✅ Ideal for curly, damaged, or color-treated hair
Commonly used in: deep conditioners, leave-ins, creams, beard balms, co-wash formulations, skin conditioners, lotion bars.
Formulator-Friendly, Mild & Globally Compliant
Typical use level:
• 2–6% in rinse-off conditioners
• 3–10% in leave-on creams & masks
• 5–20% in solid conditioner bars & anhydrous balms
Must be melted into oil phase at 65–75°C for proper emulsification.
Mild, non-irritating, readily biodegradable, and accepted under global regulations for rinse-off and leave-on products.
Formulator’s Queries, We Answered
1. What is Behentrimonium Methosulfate used for in personal care products?
Behentrimonium Methosulfate** is a mild conditioning agent and emulsifier widely used in hair care products such as conditioners, masks, and leave-in treatments. It provides excellent detangling, softening, and anti-static benefits without buildup or irritation, making it ideal for sensitive scalp and curly/textured hair formulations.
2. What is the CAS number and INCI name of Behentrimonium Methosulfate?
CAS Number: 81646-13-1
INCI Name: Behentrimonium Methosulfate
3. Is Behentrimonium Methosulfate a sulfate?
No, despite the name, Behentrimonium Methosulfate is not a sulfate detergent. It is a quaternary ammonium salt, which acts as a conditioning agent, not a cleanser. It is safe for use in sulfate-free products.
4. Is Behentrimonium Methosulfate safe for sensitive skin or scalp?
Yes, it is known for its mildness and non-irritating properties. It is suitable for use in formulations for sensitive skin and delicate scalps, including baby and clean beauty products.
5. Is Behentrimonium Methosulfate derived from natural sources?
Yes, it is typically plant-derived, made from rapeseed oil (colza oil), which is a natural source of behenic acid.
6. Can Behentrimonium Methosulfate cause buildup on hair?
No, unlike many other conditioning agents, Behentrimonium Methosulfate is lightweight and non-greasy, making it less likely to cause buildup, even with regular use.
7. Is Behentrimonium Methosulfate biodegradable?
Yes, it is considered biodegradable, aligning with eco-conscious and sustainable beauty standards.
8. Is Behentrimonium Methosulfate vegan and cruelty-free?
Yes, it is vegan-friendly and typically sourced from plant-based oils. Many suppliers offer cruelty-free certified versions. Always check for certification from suppliers to ensure compliance.
9. In what types of products is Behentrimonium Methosulfate used?
You’ll find it in:
Rinse-off conditioners
Leave-in conditioners
Hair masks and detanglers
Curly and textured hair creams
Emulsified skin lotions
10. Is Behentrimonium Methosulfate compliant with regulatory standards like California Prop 65?
Yes, Behentrimonium Methosulfate is not listed under Proposition 65, and contains no known carcinogens or reproductive toxins under regulated use.