Does DMA-18 mean a fixed single-component octadecyldimethylamine grade?

Not necessarily. DMA-18 identifies N,N-dimethyloctadecylamine as the principal tertiary amine, while commercial materials can have a defined C18 content with minor C14/C16 chain fractions. Confirm the actual carbon-chain distribution, total amine value, tertiary-amine content, primary/secondary amines, water and the stated test methods.

Can two DMA-18 offers be treated as equivalent solely from CAS 124-28-7 and a stated purity?

No. A purity figure alone does not show the carbon-chain profile or amine-quality controls that may matter in downstream reactions. Compare the agreed C18 content, total and tertiary amine values, primary/secondary amines, colour, water and methods. Then assess the proposed lot in the intended conversion or formulation process.

Is DMA-18 already the same as a cationic quaternary ammonium surfactant?

No. DMA-18 is a tertiary fatty amine intermediate. Its ionic state and downstream role depend on the intended chemistry or formulation conditions. Do not equate its identity with that of a quaternary ammonium product. Define the target derivative or system first, then select against its specific technical requirements.

Octadecyldimethylamine (DMA-18) CAS 124-28-7

Octadecyldimethylamine (DMA-18, CAS 124-28-7, EC 204-694-8) is N,N-dimethyloctadecan-1-amine, a long-chain tertiary fatty amine with the molecular formula C20H43N. It is used as a reactive intermediate for quaternary ammonium compounds, amine oxides, surfactants and other specialty derivatives. Commercial grades can differ in tertiary-amine content, carbon-chain distribution, residual primary and secondary amines, total amine value, water, color and physical form. Confirm those controls, the offered packaging and handling guidance against the current TDS, COA and SDS before process qualification.

CAS: 124-28-7
Synonyms: N,N-Dimethyloctadecan-1-amine; N,N-Dimethyloctadecylamine; Octadecyldimethylamine; Dimethyl stearamine; Stearyldimethylamine; DMA-18
Einecs: 204-694-8
Molecular Formula: C20H43N
Grade: Confirm tertiary-amine content, C18 distribution, residual primary and secondary amines, total amine value, water and color
Package: Confirm current packaging, conditioning guidance, net weight and destination requirements

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Product Description

1 Product overview

2 Technical information

3 Handling and documentation

Product overview

Octadecyldimethylamine (DMA-18, CAS 124-28-7, EC 204-694-8), also called N,N-dimethyloctadecan-1-amine or dimethyl stearamine, is a long-chain tertiary fatty amine used mainly as a chemical intermediate. It is employed in the manufacture of quaternary ammonium compounds, cationic and amphoteric surfactants, amine oxides, fabric-softener ingredients, corrosion inhibitors and other specialty derivatives. Commercial DMA-18 grades can differ in tertiary-amine content, C18 distribution, residual primary and secondary amines, total amine value, water, color and physical form. Confirm the offered specification and batch COA rather than applying another producer’s limits. Confirm current packaging, net weight and conditioning or temperature guidance in the quotation. Use the exact supplied-product SDS for PPE, equipment compatibility, transport and environmental controls.

Technical information

Product	Octadecyldimethylamine (DMA-18) CAS 124-28-7
CAS number	124-28-7
EC / list number	204-694-8
Molecular formula / identity	C20H43N
Synonyms	N,N-Dimethyloctadecan-1-amine; N,N-Dimethyloctadecylamine; Octadecyldimethylamine; Dimethyl stearamine; Stearyldimethylamine; DMA-18
Grade	Specification-defined DMA-18 grade; confirm tertiary-amine content, C18 distribution, residual primary and secondary amines, total amine value, water, color and batch COA
Packaging	Confirm current container, net weight and conditioning or temperature requirements in the quotation

Handling and documentation

Specifications may vary by grade and batch. Confirm the current TDS, COA and SDS before purchase or use. Store and handle the product in accordance with the SDS and applicable site procedures.

FAQ - Technical & Supply Chain

Q:
Does DMA-18 mean a fixed single-component octadecyldimethylamine grade?

A: Not necessarily. DMA-18 identifies N,N-dimethyloctadecylamine as the principal tertiary amine, while commercial materials can have a defined C18 content with minor C14/C16 chain fractions. Confirm the actual carbon-chain distribution, total amine value, tertiary-amine content, primary/secondary amines, water and the stated test methods.
Q:
Can two DMA-18 offers be treated as equivalent solely from CAS 124-28-7 and a stated purity?

A: No. A purity figure alone does not show the carbon-chain profile or amine-quality controls that may matter in downstream reactions. Compare the agreed C18 content, total and tertiary amine values, primary/secondary amines, colour, water and methods. Then assess the proposed lot in the intended conversion or formulation process.
Q:
Is DMA-18 already the same as a cationic quaternary ammonium surfactant?

A: No. DMA-18 is a tertiary fatty amine intermediate. Its ionic state and downstream role depend on the intended chemistry or formulation conditions. Do not equate its identity with that of a quaternary ammonium product. Define the target derivative or system first, then select against its specific technical requirements.

Ordering & Documentation

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

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