Triethylamine Storage & Tank Compatibility

Storing Triethylamine? Start Here

Triethylamine (C₆H₁₅N), the simplest fully substituted tertiary ethylamine, is a colorless, highly volatile liquid with a sharp fishy, ammonia-like odor. It is a strong organic base used as an acid scavenger and catalyst in pharmaceutical and pesticide synthesis, as a curing accelerator for foundry resins, and as a corrosion inhibitor. Because it is only slightly soluble in water yet fully miscible with organic solvents, it is most often handled neat. For bulk storage the dominant concern is its flammability: with a flash point of roughly -15 F and a wide vapor-pressure range, it readily forms ignitable vapor at room temperature. Polyethylene resists the amine itself well, so an HDPE or XLPE tank is appropriate provided the system is fully vented, bonded, grounded, and kept clear of ignition sources, acids, and strong oxidizers.

Is Triethylamine Compatible with Polyethylene Tanks?

Yes. Triethylamine is an aliphatic amine, and high-density polyethylene (HDPE) and cross-linked polyethylene (XLPE) show good resistance to amines in standard plastic resistance charts. The polyethylene wall is not chemically attacked by neat triethylamine at ambient temperature, which makes a poly tank a legitimate, cost-effective storage option for this base. The honest caveat is that compatibility here is a flammability problem, not a wall-material problem. Triethylamine's low flash point and appreciable vapor pressure mean the tank must be a code-compliant vented system kept away from ignition sources; static buildup on plastic must be controlled through proper bonding and grounding of fittings and transfer equipment. Elastomer seals matter too: use EPDM or PTFE, never Viton or nitrile, both of which amines degrade. Confirm the specific grade, temperature, and fitting selection with the tank manufacturer before committing to a poly vessel.

Material compatibility at a glance

Triethylamine is a flammable tertiary aliphatic amine that is chemically compatible with high-density and cross-linked polyethylene, so an HDPE or XLPE tank is a sound material-of-construction choice. The governing hazard is not chemical attack on the resin but flammability: with a flash point near -15 F, vapor management, grounding, bonding, and code-compliant venting drive the installation, not tank-wall chemistry.

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

• Highly flammable: flash point near -15 F. Eliminate ignition sources, bond and ground all containers and transfer lines, and store in a code-compliant, well-ventilated area away from heat and sparks.
• Corrosive and toxic: causes severe skin burns and eye damage and is toxic by inhalation, skin contact, and swallowing. Wear chemical goggles, face shield, amine-resistant gloves, and protective clothing.
• Keep separated from strong acids and strong oxidizers; the base-acid reaction is violent and exothermic.
• Provide forced ventilation or a closed, vented system; the fishy vapor is a respiratory irritant and an inhalation hazard well below odor saturation.
• Vapors are heavier than air and can travel to a distant ignition source and flash back; control low-lying vapor accumulation.
• Use EPDM or PTFE seals and gaskets only; do not use Viton (FKM) or nitrile, which amines attack.

Common questions

Can I store triethylamine in an HDPE or XLPE tank?

Yes. Polyethylene resists aliphatic amines, so HDPE and XLPE tanks are chemically compatible with neat triethylamine at ambient temperature. The constraint is flammability, not wall chemistry: the system must be fully vented, bonded, and grounded, with ignition sources controlled.

Why is the flash point such a big deal for triethylamine?

Triethylamine has a flash point around -15 F and a vapor pressure of roughly 51 mmHg at room temperature, so it produces ignitable vapor at normal ambient conditions. That makes ventilation, static control, and ignition-source management the central design issues for any storage installation.

What seal and gasket materials work with triethylamine?

Use EPDM or PTFE for gaskets, O-rings, and seals. Avoid Viton (FKM) and nitrile (Buna-N); amines attack both. Stainless steel is the preferred metal for valves and fittings.

What should triethylamine never be stored near?

Keep it away from strong acids and strong oxidizers. As a strong organic base it reacts violently and exothermically with acids, and oxidizer contact creates a fire and explosion hazard given its low flash point.