Surfactants - Cationic Available — Bulk Only

Methyltrioctylammonium Chloride (TOMAC, Trioctylmethylammonium Chloride)

NH4Cl / Sal Ammoniac
CAS 5137-55-3 · Formula C25H54ClN · MW 404.2 g/mol

A quaternary ammonium phase-transfer catalyst that shuttles ionic reagents between aqueous and organic phases. It functions as a phase-transfer catalyst and is used in liquid chromatography for separations.

Request SDS
UN Number
UN 2922
Hazard Class
Class 8
HS Code
2923.90
At a Glance
Material Family
Surfactants - Cationic
Record Type
Pure compound
Primary Role
Surfactancy · Biocidal Action
Functional Roles
Applications & Use Cases
  • Phase-transfer catalyst: Transfers ionic reagents into the organic phase to drive two-phase reactions.
  • Separations: Used in high-performance liquid chromatography for separation, including of tRNA.
  • Formulation additive: Permitted as an inert ingredient in non-food pesticide products.
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

Request SDS →
DOT / UN Transport Classification
DOT hazard class 8 placard
UN / DOT NumberUN 2922
Hazard Class / DivisionClass 8
Proper Shipping NameCorrosive liquids, toxic, n.o.s.

Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.

HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2923 . 90
Chapter 29
Organic chemicals
Heading 29.23
Internationally harmonized (WCO HS)
Subheading 2923.90
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
5137-55-3
Molecular Formula
C25H54ClN
Molecular Weight
404.2 g/mol
IUPAC Name
methyl(trioctyl)azanium chloride
PubChem CID
InChI Key
XKBGEWXEAPTVCK-UHFFFAOYSA-M
Synonyms & Trade Names
Methyltrioctylammonium chloride Trioctylmethylammonium chloride TOMAC Capriquat Methyltricaprylylammonium chloride Tricaprylmethylammonium chloride Tricaprylylmethylammonium chloride Trioctylmonomethylammonium chloride N-Methyl-N,N-dioctyl-1-octanaminium chloride AMMONIUM, METHYLTRIOCTYL-, CHLORIDE Tricaprylyl methyl ammonium chloride Aliquat 128 TOMAC 75 TOMAC salt
Full Description

Methyltrioctylammonium chloride (TOMAC, CAS 5137-55-3) is a quaternary ammonium chloride salt. It functions as a phase-transfer catalyst and is used in liquid chromatography for separations. It is also permitted as an inert ingredient in non-food pesticide products.

Frequently Asked Questions

What does Aliquat 336 do?

Aliquat 336 (methyltrioctylammonium chloride, TOMAC, CAS 5137-55-3) is a quaternary ammonium chloride salt that acts as a phase-transfer catalyst, ferrying ionic reagents into the organic phase to drive two-phase reactions. It is also used in liquid chromatography separations and is permitted as an inert ingredient in non-food pesticide products.

What is methyltrioctylammonium chloride used for?

It is used as a phase-transfer catalyst in organic synthesis, as a stationary/mobile-phase modifier in high-performance liquid chromatography separations including tRNA, and as an extractant carrier in liquid-liquid metal extraction. It also serves as an inert formulation additive in non-food pesticide products.

Is Aliquat 336 the same as Adogen 464 or tricaprylylmethylammonium chloride?

These are closely related quaternary ammonium chloride surfactants with C8 (octyl/caprylyl) alkyl chains and overlapping CAS coverage, and are often used interchangeably as phase-transfer catalysts. Exact chain-length distribution and assay vary by source, so specify your required purity and confirm identity against the CoA.

What is the molecular formula of methyltrioctylammonium chloride?

Its representative formula is C25H54ClN (CAS 5137-55-3). It is a cationic surfactant supplied as a viscous liquid; request the SDS and CoA for assay and physical-property data.

How is Aliquat 336 supplied in bulk?

RawSource supplies cationic surfactants such as methyltrioctylammonium chloride in bulk industrial packaging including drums and totes/IBCs for synthesis and separations users. Pricing varies with grade and volume, so submit a bulk quote with your target quantity and packaging; a CoA and SDS accompany each shipment.

Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.