What is Behentrimonium Methosulfate CAS 81646-13-1?

It is a cationic quaternary ammonium surfactant with the chemical name docosyltrimethylammonium methyl sulfate and molecular formula C26H57NO4S. Its molecular weight is about 479.8 g/mol, and it is widely referred to as BTMS.

Why is BTMS often supplied as a blend rather than a pure powder?

Commercial hair-care grades are frequently blended with fatty alcohols such as cetearyl alcohol to create a self-emulsifying conditioning base. The blend is easier to handle as flakes or pellets and can be incorporated into hot-process emulsions.

How does Behentrimonium Methosulfate condition hair?

Because it is cationic, it can deposit onto negatively charged hair surfaces and improve slip, detangling, softness, and static control. This makes it useful in rinse-off conditioners, hair masks, and leave-in conditioning products.

What is the difference between Behentrimonium Methosulfate and Behentrimonium Chloride?

Both are cationic conditioning quaternary compounds with similar detangling benefits, but the methosulfate form is commonly commercialized as a blended self-emulsifying system with fatty alcohols. Behentrimonium Chloride may be supplied as a less blended conditioning active, so the required stabilizer or fatty alcohol should be confirmed for the specific grade.

How should formulators use it?

It is normally added to the heated oil phase of a conditioner or cream formulation and mixed until dispersed before cooling. The exact melting point and active content depend on the blend, so formulators should confirm the supplier specification and recommended use level.

How should Behentrimonium Methosulfate be stored?

Store the flakes or pellets in sealed containers in a cool, dry, well-ventilated area, away from moisture, direct sunlight, and excessive heat. Protecting the packaging helps prevent caking, contamination, and changes in consistency.

Behentrimonium Methosulfate CAS 81646-13-1

Behentrimonium Methosulfate is supplied as a cationic quaternary ammonium compound used in conditioning formulations, primarily in hair care systems where detangling, softening, and antistatic performance are required. In commercial practice, it is commonly provided as a formulated raw material blended with fatty alcohols (such as cetearyl alcohol) to improve handling, stability, and formulation compatibility.

This product is widely used in conditioners, hair masks, and cream-based systems, where it functions as a conditioning emulsifier and deposition aid. For formulations specified around a C16 quaternary cation, Cetrimonium Chloride is a related conditioning ingredient for comparison. It is available in flake or pellet form, suitable for hot-process emulsification. Standard packaging, batch documentation (COA, TDS, SDS), and supply support are available for both formulation development and bulk production.

CAS: 81646-13-1
Synonyms: Docosyltrimethylammonium Methosulfate; BTMS; Behentrimonium Methosulfate
Einecs: 279-791-1
Molecular Formula: C26H57NO4S
Grade: Typically supplied for cosmetic and personal care formulation use
Package: Available in bags or fiber drums for solid forms; packaging arranged according to product form (flakes, pellets, or blends) and order volume

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Product Description

1 Physicochemical Properties

2 Typical Applications

3 Packaging

4 Storage

Physicochemical Properties

Item	Description
Appearance	White to off-white flakes or pellets (commercial blend form)
Odor	Mild characteristic odor
Active Content	Varies depending on blend (commonly supplied with fatty alcohols)
Solubility	Dispersible in water; forms emulsions upon heating
Melting Point	Dependent on formulation (typically 50–70°C range for blends)
pH (aqueous dispersion)	Mildly acidic to neutral
Ionic Character	Cationic
Compatibility	Compatible with nonionic and amphoteric surfactants

Typical Applications

Hair conditioners and rinse-off conditioning systems
Hair masks and treatment creams
Leave-in conditioners and detangling formulations
Emulsifying and conditioning systems in personal care formulations

Formulation use should be evaluated based on system compatibility and local regulatory requirements.

Packaging

Behentrimonium Methosulfate is typically supplied in solid form such as flakes or pellets, often as a formulated blend. It is packed in sealed bags, fiber drums, or lined containers to protect against moisture and contamination. Packaging is designed to maintain product integrity during storage and transport, with options adjusted according to order volume and logistics requirements.

Storage

Store in a cool, dry, and well-ventilated area. Keep containers tightly sealed to prevent moisture uptake and contamination. Avoid exposure to excessive heat and direct sunlight, which may affect product consistency. Maintain packaging integrity to ensure stable handling and performance.

For related cationic conditioner and quaternary ammonium pages, compare Behentrimonium Chloride, Dodecyltrimethylammonium Chloride, and Cetrimonium Chloride.

FAQ - Technical & Supply Chain

Q:
What is Behentrimonium Methosulfate CAS 81646-13-1?

A: It is a cationic quaternary ammonium surfactant with the chemical name docosyltrimethylammonium methyl sulfate and molecular formula C26H57NO4S. Its molecular weight is about 479.8 g/mol, and it is widely referred to as BTMS.
Q:
Why is BTMS often supplied as a blend rather than a pure powder?

A: Commercial hair-care grades are frequently blended with fatty alcohols such as cetearyl alcohol to create a self-emulsifying conditioning base. The blend is easier to handle as flakes or pellets and can be incorporated into hot-process emulsions.
Q:
How does Behentrimonium Methosulfate condition hair?

A: Because it is cationic, it can deposit onto negatively charged hair surfaces and improve slip, detangling, softness, and static control. This makes it useful in rinse-off conditioners, hair masks, and leave-in conditioning products.
Q:
What is the difference between Behentrimonium Methosulfate and Behentrimonium Chloride?

A: Both are cationic conditioning quaternary compounds with similar detangling benefits, but the methosulfate form is commonly commercialized as a blended self-emulsifying system with fatty alcohols. Behentrimonium Chloride may be supplied as a less blended conditioning active, so the required stabilizer or fatty alcohol should be confirmed for the specific grade.
Q:
How should formulators use it?

A: It is normally added to the heated oil phase of a conditioner or cream formulation and mixed until dispersed before cooling. The exact melting point and active content depend on the blend, so formulators should confirm the supplier specification and recommended use level.
Q:
How should Behentrimonium Methosulfate be stored?

A: Store the flakes or pellets in sealed containers in a cool, dry, well-ventilated area, away from moisture, direct sunlight, and excessive heat. Protecting the packaging helps prevent caking, contamination, and changes in consistency.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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