Dimethylethanolamine (DMEA) Storage & Tank Compatibility

Storing Dimethylethanolamine (DMEA)? Start Here

Dimethylethanolamine (DMEA), 2-(dimethylamino)ethanol, is a clear, colorless liquid carrying both a tertiary amine and a primary alcohol on a short C₄H₁₁NO backbone. That dual functionality makes it strongly alkaline yet completely miscible with water, the reason it is used as a neutralizing amine in boiler and steam-condensate treatment, an acid-gas (hydrogen sulfide) scrubbing agent, a catalyst for polyurethane foams, and a curing accelerator for epoxy systems. It is also a precursor to surfactants, water-based coating amines, and pharmaceutical salts. Because DMEA is corrosive to skin and eyes, toxic by inhalation, and flammable, bulk storage demands a chemically matched tank. The good news for tank selection is that, like most alkanolamines, DMEA is well-suited to polyethylene: aqueous amine streams sit squarely in the compatible column of standard polyethylene resistance charts.

Is Polyethylene (HDPE / XLPE) Compatible with Dimethylethanolamine?

Yes - HDPE and XLPE are the recommended polyethylene grades for storing dimethylethanolamine and its water solutions. Amines, alkanolamines, alcohols, and aqueous salt or base solutions fall in the chemically resistant group for polyethylene, which is non-polar and shrugs off the hydrogen-bonding amine and hydroxyl groups that would attack many elastomers and rigid PVC. Published polyethylene chemical-resistance tables rate dimethylethanolamine and related amino-alcohols as satisfactory at ambient temperature. Practical guidance: size the tank for the listed specific gravity (about 0.89, lighter than water), keep stored product near ambient because resistance and tank pressure ratings fall as temperature rises, and fit the tank with EPDM gaskets and stainless or polypropylene hardware rather than Viton. Vent the tank to manage amine vapor, and keep the system away from ignition sources given the 105 F flash point. As always, confirm the exact grade, concentration, and service temperature against the resin manufacturer's resistance chart before commissioning.

Material compatibility at a glance

Dimethylethanolamine is a water-miscible tertiary amino-alcohol. HDPE and crosslinked polyethylene (XLPE) are the standard tank materials, fully compatible with neat DMEA and its aqueous solutions at ambient temperature. Use EPDM elastomers and 316 stainless or polypropylene for wetted hardware; avoid Viton (FKM) and treat rigid PVC as conditional.

Ratings: S suitable · C conditional / limited · U unsuitable. Verify against the cited resistance charts and your concentration/temperature before specifying.

The safety that actually matters

• Corrosive: DMEA causes severe skin burns and serious eye damage (H314 / H318). Wear chemical-splash goggles, a face shield, and amine-resistant gloves; provide an emergency eyewash and safety shower at the fill point.
• Toxic by inhalation (H331): the fishy amine vapor is an irritant to the respiratory tract (H335). Use local exhaust ventilation and respiratory protection when transferring or sampling.
• Flammable liquid and vapor (H226), flash point 105 F: keep away from heat, sparks, open flame, and static; bond and ground during transfer and use only spark-rated pumps and fittings.
• Reactive base: DMEA is incompatible with strong oxidizers, strong acids, isocyanates, anhydrides, acid halides, and epoxides - segregate storage and never co-mingle.
• Provide secondary containment sized to the tank; DMEA is harmful to aquatic life (H402) and must be kept out of drains and waterways.
• May cause organ damage on prolonged exposure (H373) and skin sensitization (H317); limit repeated contact and follow the manufacturer SDS for exposure controls.

Common questions

Can I store dimethylethanolamine in a polyethylene tank?

Yes. HDPE and crosslinked polyethylene (XLPE) are the standard tank materials for DMEA and its aqueous solutions. Amino-alcohols are listed as compatible with polyethylene at ambient temperature; pair the tank with EPDM gaskets and stainless or polypropylene fittings, and confirm the specific grade against the resin maker's resistance chart.

What is the NFPA 704 rating for dimethylethanolamine?

Per CAMEO Chemicals, DMEA is Health 3, Flammability 2, Instability 0, with no special hazard symbol. The Health 3 reflects its corrosivity and inhalation toxicity, and the Flammability 2 reflects a flash point of about 105 F.

What gaskets and seals work with DMEA?

Use EPDM for gaskets and O-rings; it resists amines well at ambient temperature. Avoid Viton (FKM), which amines attack. Polypropylene and 316 stainless steel are good choices for valves, fittings, and wetted hardware; treat rigid PVC as conditional.

Why does dimethylethanolamine smell like fish?

The fishlike odor is characteristic of low-molecular-weight amines. DMEA is volatile enough that even small releases are detectable, so good ventilation and a closed transfer system are important - the odor is a useful early warning of a vapor leak.