Isopropanolamine (Monoisopropanolamine, MIPA) Storage & Tank Compatibility

Storing Isopropanolamine (Monoisopropanolamine, MIPA)? Start Here

Isopropanolamine, also called monoisopropanolamine or MIPA (C₃H₉NO), is a colorless, water-miscible alkanolamine that combines a basic amine group with a secondary alcohol. That dual chemistry makes it a versatile acid-gas absorbent, neutralizer, and intermediate. Industry uses it to scrub hydrogen sulfide and carbon dioxide from gas streams, to neutralize fatty acids in metalworking and cutting fluids, as a pH buffer and corrosion inhibitor in coatings, cleaners, and cement admixtures, and as a building block for surfactants, herbicide salts, and pharmaceuticals. Because it is strongly alkaline and corrosive to skin and eyes, the material of construction matters: the wrong elastomer or a copper-bearing alloy will degrade, contaminate the product, or fail in service. Choosing a tank, gasket, and fitting package that is genuinely rated for amine duty protects both the chemical and the people handling it.

Can you store isopropanolamine in a poly tank?

Yes. Isopropanolamine is compatible with polyethylene. Published resistance charts rate amines, alkanolamines, alcohols, and glycols as Resistant on both HDPE and crosslinked (XLPE) polyethylene at ambient temperature, and aqueous ammonia (a close chemical analog) is likewise rated Resistant. A chemical-service poly tank is a sound, economical choice for bulk MIPA. Specify a tank rated for the fluid’s specific gravity (about 0.96, so standard 1.5 SG tanks are more than adequate), use EPDM gaskets rather than Viton/FKM, and avoid any copper, brass, bronze, or aluminum in wetted hardware. For heated, high-temperature, or high-purity applications, 316 stainless steel is the upgrade path; otherwise quality poly performs well for storage and dispensing.

Material compatibility at a glance

Isopropanolamine is an alkaline alkanolamine that is compatible with chemical-grade HDPE and XLPE polyethylene, polypropylene, and 304/316 stainless steel. Avoid copper alloys, aluminum, and fluoroelastomer (Viton/FKM) seals; specify EPDM gaskets.

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 (H314/H318): Causes severe skin burns and serious eye damage — full face shield, chemical goggles, and amine-resistant gloves are mandatory.
• Harmful by ingestion and skin contact (H302/H312): Avoid swallowing and prevent prolonged or repeated skin exposure.
• Combustible liquid: Flash point near 77 °C (171 °F); keep away from heat, sparks, and open flame and store in a cool, ventilated area.
• Strong base: Reacts exothermically with acids; segregate from acids, oxidizers, and isocyanates and add slowly when neutralizing.
• Vapor and mist: Provide local exhaust; vapor and aerosols irritate the respiratory tract and eyes.
• Aquatic hazard (H402): Harmful to aquatic life — contain spills and prevent release to drains or surface water.

Common questions

Is isopropanolamine compatible with HDPE and XLPE tanks?

Yes. Polyethylene resistance charts rate amines, alkanolamines, and alcohols as Resistant on HDPE and XLPE at ambient temperature. Use a chemical-service poly tank rated to the fluid specific gravity (about 0.96), with EPDM seals.

What is the NFPA 704 rating for isopropanolamine?

OSHA and NOAA CAMEO Chemicals both list Health 3, Flammability 2, and Instability 0, with no special hazard. It is corrosive and a combustible liquid but normally stable.

Which materials should be avoided with isopropanolamine?

Avoid copper, brass, bronze, and aluminum, which this alkaline amine corrodes, and avoid Viton/FKM elastomer seals, which amines attack. Specify EPDM gaskets and poly, polypropylene, or 316 stainless wetted parts instead.

Is isopropanolamine flammable?

It is a combustible liquid rather than a highly flammable one, with a closed-cup flash point near 77 °C (171 °F). Keep it away from heat and ignition sources and store it cool and ventilated.