Why is it used in hair conditioners?

Its long C22 behenyl chain gives strong substantivity to negatively charged hair surfaces, providing detangling, smoothing, antistatic and conditioning effects. It is often combined with fatty alcohols such as cetearyl alcohol to build creamy conditioner bases.

Can it act as a primary emulsifier?

Yes. It can function as a cationic primary emulsifier in oil-in-water emulsions, especially when formulated with cetearyl alcohol or similar fatty alcohols. This is useful for rinse-off conditioners, hair masks and some cream formulations.

What are the main applications?

It is used in hair conditioners, leave-in treatments, hair masks, cream rinses, fabric softeners and antistatic formulations. It may also be used in skin-care and cleansing systems where a cationic conditioning emulsifier is desired.

Is it compatible with anionic surfactants?

Because it is cationic, direct high-level combination with anionic surfactants can form complexes or reduce performance. It is best used in cationic or nonionic systems; if anionic ingredients are needed, formulation compatibility should be tested.

Which grade and packaging does this listing cover?

The listing is cosmetic/industrial grade and is supplied in 25 kg bags or cartons on pallets. Other packing can be arranged on request, with active-matter level and grade confirmed against the current batch data.

Docosyltrimethylammonium Methyl Sulphate CAS 81646-13-1

Docosyltrimethylammonium Methyl Sulphate (CAS 81646-13-1) is a quaternary ammonium compound functioning as a cationic surfactant and emulsifier in cosmetic formulation processes. Chemically recognized as Behentrimonium Methosulfate or BTMS, this waxy solid acts effectively to reduce static electricity and improve substantivity in hair care systems. As a specialized 1-Docosanaminium N,N,N-trimethyl- methyl sulfate derivative, it serves as a primary conditioning agent and thickening stabilizer within oil-in-water emulsions. We ensure bulk supply capabilities for this material, providing access to competitive factory pricing and customized specifications to meet specific active content requirements. Full technical documentation, including MSDS, TDS, COA, is available to support compliance and safety protocols.

CAS: 81646-13-1
Synonyms: Behentrimonium Methosulfate, BTMS, N,N,N-trimethyl-1-docosanaminium methyl sulfate, Docosyltrimethylammonium methosulfate
Einecs: 279-791-1
Molecular Formula: C26H57NO4S
Grade: Cosmetic / Industrial grade
Package: 25 kg bags or cartons on pallets (other packing on request)

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Product Description

1 Product Overview

2 Physicochemical Properties

3 Applications

4 Storage Conditions

5 Safety Precautions

Product Overview

Docosyltrimethylammonium Methyl Sulphate is a quaternary ammonium surfactant used mainly as a hair conditioning and cationic emulsifying agent in cosmetic and personal care formulations. It is commonly supplied as BTMS-50 type material (approx. 50% active Behentrimonium Methosulfate in waxy flakes), offering excellent detangling, softening and antistatic performance in shampoos, conditioners and creams.

📧 Email: info@industrochem.com – Contact our technical & sales team for COA, MSDS and latest FOB prices.

Physicochemical Properties

Item	Typical Data / Description
Appearance	White to off-white waxy flakes or pastilles
Odor	Slight, characteristic, low residual amine odor
Molecular Formula	C₂₆H₅₇NO₄S
Molecular Weight	479.81 g/mol
Density	~0.92 g/cm³ at 20 °C
Active Content (BTMS-50)	~50% Behentrimonium Methosulfate in fatty alcohol matrix
pH (2–5% aqueous dispersion)	Approx. 5.0–7.0
Melting Point	~60–70 °C (waxy flakes soften & melt in this range)
Solubility	Dispersible in warm water; soluble in ethanol and isopropanol; very low water solubility for pure salt
Ionic Character	Cationic surfactant
Compatibility	Compatible with cationic & nonionic surfactants; limited compatibility with anionics
Stability	Stable under normal processing; good heat, light and acid/alkali resistance; stable below 100 °C

(The above values are typical technical data, not to be used as product specification. Detailed COA is available on request.)

Applications

1. Hair Care

Rinse-off hair conditioners and cream rinses
2-in-1 shampoos and conditioning shampoos
Deep treatment masks and hair repair creams
Leave-in conditioners, detangling sprays and anti-frizz serums

Key functions in hair formulations:

Detangling and anti-static effect on wet and dry hair
Enhanced softness, glide and dry combability
Film-forming conditioning without heavy build-up when used at recommended dosage

2. Skin & Body Care

Body lotions, creams and butters (as cationic emulsifier + skin conditioner)
Hand creams and foot care products requiring rich, non-tacky after-feel

Benefits:

Builds stable, fine emulsions with silky, powdery after-feel
Improves spreadability and increases perceived moisturization

3. Home & Textile Care (optional)

Fabric softeners and textile conditioners (cationic softening & antistatic agent)
Antistatic component in specialty cleaners or polishes

Storage Conditions

Store in cool, dry and well-ventilated warehouse.
Keep in original, tightly closed package to avoid moisture uptake and contamination.
Recommended storage temperature: 10–30 °C, away from direct sunlight and heat sources.
Do not store near strong oxidizing agents or strong acids.
Shelf life: 24 months from production date in unopened original packaging (refer to actual COA/label).

Safety Precautions

For industrial use only.
Avoid direct contact with eyes, skin and clothing.
Wear appropriate protective gloves, goggles and work clothing when handling bulk material.
Avoid generating dust/aerosol; use local exhaust ventilation where powder handling is involved.
In case of skin contact: wash with plenty of soap and water.
In case of eye contact: rinse carefully with water for several minutes; seek medical attention if irritation persists.
Do not ingest. If swallowed, rinse mouth and seek medical advice.
Keep away from food and animal feed.
Keep out of reach of children.

(For detailed hazard classification and first-aid measures, please refer to the product SDS.)

FAQ - Technical & Supply Chain

Q:
What is Docosyltrimethylammonium Methyl Sulphate CAS 81646-13-1?

A: Docosyltrimethylammonium methyl sulphate is a cationic quaternary ammonium compound more commonly known as behentrimonium methosulfate or BTMS. It is supplied as white to off-white waxy flakes or pastilles and is used mainly in hair-care and fabric-softening formulations.
Q:
Why is it used in hair conditioners?

A: Its long C22 behenyl chain gives strong substantivity to negatively charged hair surfaces, providing detangling, smoothing, antistatic and conditioning effects. It is often combined with fatty alcohols such as cetearyl alcohol to build creamy conditioner bases.
Q:
Can it act as a primary emulsifier?

A: Yes. It can function as a cationic primary emulsifier in oil-in-water emulsions, especially when formulated with cetearyl alcohol or similar fatty alcohols. This is useful for rinse-off conditioners, hair masks and some cream formulations.
Q:
What are the main applications?

A: It is used in hair conditioners, leave-in treatments, hair masks, cream rinses, fabric softeners and antistatic formulations. It may also be used in skin-care and cleansing systems where a cationic conditioning emulsifier is desired.
Q:
Is it compatible with anionic surfactants?

A: Because it is cationic, direct high-level combination with anionic surfactants can form complexes or reduce performance. It is best used in cationic or nonionic systems; if anionic ingredients are needed, formulation compatibility should be tested.
Q:
Which grade and packaging does this listing cover?

A: The listing is cosmetic/industrial grade and is supplied in 25 kg bags or cartons on pallets. Other packing can be arranged on request, with active-matter level and grade confirmed against the current batch data.

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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