Ethyl tert-Butyl Ether (ETBE) Storage & Tank Compatibility

Storing Ethyl tert-Butyl Ether (ETBE)? Start Here

Ethyl tert-butyl ether (ETBE), C₆H₁₄O, is a colorless, extremely flammable liquid produced from ethanol and isobutylene and blended into gasoline as a high-octane oxygenate. With a flash point near -19 C and a boiling point around 72 C, it forms ignitable vapor at ordinary temperatures and demands the same handling discipline as gasoline itself. As a small, nonpolar ether molecule, ETBE readily migrates into and swells polyethylene, so cross-linked (XLPE) and high-density (HDPE) polyethylene tanks are not appropriate for its storage. ETBE is only slightly soluble in water but is harmful to aquatic life and is a suspected carcinogen, making leak-tight containment essential. Proper storage relies on steel vessels engineered for flammable petroleum service, fluoropolymer seals, vapor recovery, and rigorous bonding and grounding to control static ignition.

Why Polyethylene Tanks Are Not Suitable for ETBE

Polyethylene chemical-resistance charts rate ethers and fuel oxygenates such as MTBE and ETBE as not recommended for HDPE and XLPE. Although polyethylene tolerates many water-based and salt solutions, small nonpolar hydrocarbon ethers behave like solvents toward the polymer: ETBE is absorbed into the polyethylene wall, causing it to swell, soften, lose mechanical strength, and permeate vapor through the tank. Over time this leads to stress cracking, weeping, and loss of containment of a flammable, environmentally hazardous liquid. For these reasons ETBE should never be stored in a standard poly water, chemical, or cone-bottom tank. Use steel tanks (carbon steel or 316 stainless) built and listed for flammable petroleum products, fitted with PTFE or FKM (Viton) seals and gaskets, vapor control, and bonding and grounding. If you are unsure whether your existing tank is rated for fuel-oxygenate service, contact our team before transferring product.

Material compatibility at a glance

Ethyl tert-butyl ether is a volatile, extremely flammable hydrocarbon ether used as a gasoline oxygenate, and it is not compatible with polyethylene (HDPE or XLPE) tanks. ETBE permeates and softens polyethylene and polypropylene, so it must be stored in steel (carbon or 316 stainless) vessels rated for flammable petroleum products, with fluoropolymer (PTFE or FKM/Viton) seals, full bonding and grounding, vapor control, and explosion-proof transfer equipment.

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

• Treat ETBE as you would gasoline: extremely flammable, with vapor that ignites at ordinary temperatures (flash point near -19 C). Keep all ignition sources away.
• Bond and ground all containers and transfer equipment to prevent static discharge during filling and dispensing.
• Store in steel tanks rated for flammable petroleum liquids; never in polyethylene or polypropylene. Provide proper venting, vapor control, and secondary containment.
• ETBE can form explosive peroxides on prolonged contact with air; avoid long stagnant storage, evaporation to dryness, and test old stock before use.
• Use respiratory and skin protection: vapor causes irritation, drowsiness, and dizziness, and ETBE is a suspected carcinogen. Ventilate work areas well.
• Prevent releases to soil and water; ETBE is harmful to aquatic life. Have spill response and absorbents on hand and keep away from drains.

Common questions

Can I store ethyl tert-butyl ether in an HDPE or XLPE poly tank?

No. ETBE is a hydrocarbon ether and fuel oxygenate that polyethylene resistance charts rate as not recommended. It is absorbed into the polyethylene, swelling and softening the wall and permeating vapor, which leads to stress cracking and loss of containment. Use steel tanks built for flammable petroleum service instead.

What tank material is correct for ETBE?

Carbon steel or 316 stainless steel vessels listed for flammable petroleum liquids, fitted with fluoropolymer seals such as PTFE or FKM (Viton). These resist ether attack and provide the leak-tight, fire-rated containment ETBE requires.

Is ETBE flammable?

Yes, extremely. It carries GHS statements H224 and H225 and an NFPA flammability rating of 3, with a flash point near -19 C. Its vapor forms ignitable mixtures at normal temperatures, so bonding, grounding, and ignition control are mandatory.

Why is ETBE used and what makes it hazardous?

ETBE is blended into gasoline as a high-octane oxygenate. Its hazards include extreme flammability, irritation of skin, eyes, and the respiratory tract, drowsiness and dizziness from vapor, suspected carcinogenicity, and toxicity to aquatic life, so it must be contained tightly and handled like gasoline.