2-Butoxyethanol (Ethylene Glycol Monobutyl Ether) Storage & Tank Compatibility

Storing 2-Butoxyethanol (Ethylene Glycol Monobutyl Ether)? Start Here

2-Butoxyethanol, also sold as butyl glycol or butyl cellosolve, is the n-butyl ether of ethylene glycol with the formula C₆H₁₄O₂. It is a clear, colorless liquid that is fully miscible with water and most organic solvents, which is why it anchors so many surface cleaners, paints, coatings, and industrial degreasers. The molecule pairs an ether linkage with a terminal hydroxyl group, giving it both solvency for oils and grease and compatibility with water-based formulations. With a high boiling point near 171 C and a low vapor pressure, it evaporates slowly and stays in the liquid phase across normal storage temperatures. Those same properties make it a common bulk solvent that fabricators need to store safely. Because it is toxic by skin contact and inhalation and can damage organs, containment, ventilation, and correct tank selection all matter when handling it at volume.

Storing 2-Butoxyethanol in HDPE and XLPE Tanks

Polyethylene is a reasonable, common choice for 2-butoxyethanol because it is an oxygenated, water-miscible glycol ether rather than an aggressive aromatic, chlorinated, ketone, or strong-oxidizer solvent. Published polyethylene resistance charts generally rate butyl glycol and similar glycol ethers as good or satisfactory in HDPE and crosslinked polyethylene at ambient temperature, which is why we list HDPE / XLPE as Conditional rather than fully recommended. The honest caveats matter: CAMEO Chemicals notes that the solvent can attack some forms of plastics, rubber, and coatings, and elevated temperature increases the tendency of any solvent to swell or soften a polymer. For that reason, store near ambient temperature, confirm the specific tank resin and gasket grade against the manufacturer's chemical resistance data, and keep the tank closed and dry to limit peroxide formation. Used within those limits, a quality PE tank with compatible fittings is a practical and economical option for this solvent.

Material compatibility at a glance

2-Butoxyethanol is an oxygenated glycol ether solvent that polyethylene (HDPE and XLPE) generally tolerates at ambient temperature, making a quality PE tank a practical storage option once grade and temperature are confirmed. 316 stainless steel and Viton (FKM) are dependable for wetted metal and elastomer parts. Avoid aluminum, which the solvent may attack, and keep vessels closed and dry to limit peroxide formation on exposure to air and light.

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 2-butoxyethanol as toxic by skin contact and inhalation; the GHS classification includes fatal in contact with skin (H310) and fatal if inhaled (H330), so use chemical-resistant gloves, splash goggles, and adequate ventilation.
• It is a combustible liquid (flash point about 61 C / 141 F); keep it away from heat, sparks, and open flame and bond and ground containers during transfer.
• The solvent can form peroxides on exposure to air and light; store in closed, opaque or shaded containers, keep it dry, and avoid long-term storage of opened drums.
• Avoid contact with aluminum, strong bases, and strong oxidizers, all of which can react with the material.
• Provide eyewash and emergency shower access; the material causes serious eye damage (H318) and may damage organs (H370, H372).
• Confirm tank, gasket, and fitting compatibility before filling, and keep storage near ambient temperature for the most reliable polyethylene service.

Common questions

Can I store 2-butoxyethanol in an HDPE or XLPE tank?

Generally yes at ambient temperature. As an oxygenated, water-miscible glycol ether, it is usually rated good or satisfactory in polyethylene, which is why we mark HDPE / XLPE as Conditional. Because CAMEO notes it can attack some plastics, verify the specific resin and gasket grade and keep storage near ambient temperature before committing.

What is the NFPA 704 rating for 2-butoxyethanol?

Per CAMEO Chemicals, the ratings are Health 3, Flammability 2, and Instability 0, with no special hazard. The Health 3 reflects that it can cause serious injury and is toxic by skin contact and inhalation.

Is 2-butoxyethanol flammable?

It is a combustible liquid with a closed-cup flash point near 61 C (141 F), earning an NFPA flammability rating of 2. It needs moderate heating before it will ignite, but you should still keep it away from heat, sparks, and flame.

What materials should I avoid with 2-butoxyethanol?

Avoid aluminum, which the solvent may attack, along with strong bases and strong oxidizers. Confirm elastomer choices too, since it can attack some rubbers; 316 stainless steel and Viton (FKM) are dependable options for wetted parts.