- ▸ 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.
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 →
Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.
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.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 225-896-2
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
- Solvent Extraction (SX) Reagents for Hydrometallurgy (Oil, Gas & Mining)
Frequently Asked Questions
What does methyltrioctylammonium chloride do?
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.
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 methyltricaprylylammonium chloride 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.
What is the REACH and TSCA regulatory status of Methyltrioctylammonium Chloride (TOMAC, Trioctylmethylammonium Chloride)?
Methyltrioctylammonium Chloride (TOMAC, Trioctylmethylammonium Chloride) (CAS 5137-55-3) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 225-896-2).
What is the CAS number of Methyltrioctylammonium Chloride?
The CAS number of Methyltrioctylammonium Chloride is 5137-55-3.