Bromine Storage & Tank Compatibility

Storing Bromine? Start Here

Bromine (Br₂, CAS 7726-95-6) is a dark reddish-brown, fuming, mobile liquid and one of the most chemically aggressive substances in common industrial use. It is a powerful oxidizer (NFPA special hazard OX), violently corrosive to tissue and metals, and acutely toxic by inhalation. At roughly three times the density of water, a given volume weighs far more than the same volume of a typical chemical, so vessel structural loading and secondary-containment sizing must account for the extreme specific gravity.

Because bromine attacks nearly every common plastic and metal, it cannot be stored in standard polyethylene tanks. Suitable containment is limited to specialist materials - glass, lead-lined steel, fluoropolymer (PVDF / PTFE) linings, or nickel alloys for dry-bromine service - all engineered for the specific duty.

Why Polyethylene Tanks Cannot Store Bromine

Standard rotomolded polyethylene tanks - the workhorse of most chemical storage - are not suitable for liquid bromine at any concentration or temperature. Published chemical-resistance data rate polyethylene as "not recommended" for bromine; the chemical attacks the polymer directly, and as a strong oxidizer it can degrade and even ignite organic materials on contact. Polypropylene, PVC, and natural-rubber elastomers fail for the same reasons.

This is not a case where a thicker wall, a different resin grade, or a fitting upgrade makes a poly tank workable. Bromine containment requires inherently resistant materials of construction: glass or glass-lined steel, lead-lined steel, PVDF (Kynar) or PTFE (Teflon) fluoropolymer linings, or nickel alloys (Monel, Hastelloy) for dry-bromine service only. If you have a bromine storage or transfer requirement, treat it as a specialist engineered-containment project from the outset. OneSource builds engineered containment for aggressive chemistries - dual-laminate (FRP with fluoropolymer liner) construction, SPCC secondary containment, and full custom fabrication. Call our engineering team at 866-418-1777 to scope a bromine-service solution.

Material compatibility at a glance

Liquid bromine is one of the most aggressive common industrial chemicals. It attacks nearly all plastics - including polyethylene - most metals, and natural rubber. There is NO polyethylene-tank option. Acceptable containment is specialist only: glass or glass-lined steel, lead-lined steel, PVDF / PTFE (Teflon) fluoropolymer linings, or - for dry bromine only - nickel alloys such as Monel and Hastelloy. Wet bromine is markedly more corrosive than dry bromine and narrows the material choices further. Selection, lining, and detailing must be done by a specialist for the exact service.

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

Fatal if inhaled (H330). Bromine evolves a heavy, corrosive, toxic vapor even at room temperature. Concentrations around 200 mg/m³ can be fatal in a short time, and far lower levels cause severe choking and respiratory injury. Engineering controls, scrubbing, and respiratory protection are mandatory; never rely on smell as a warning.

Severe corrosivity (H314 / H318). Liquid and vapor cause severe burns to skin, eyes, and respiratory tract, and bromine is corrosive to most metals (H290). Full chemical PPE, eyewash, and emergency deluge are required at any handling point.

Strong oxidizer (NFPA OX). Bromine is a powerful oxidizing agent that can ignite combustible and organic materials on contact and reacts violently with many organics and reactive metals. Keep isolated from fuels, reducers, and incompatible materials.

Extreme density. At specific gravity ~3.1, bromine is roughly three times as heavy as water. Containment, supports, and secondary-containment volume must be designed for this load, not for a water-equivalent fill.

Aquatic toxicity (H400). Very toxic to aquatic life - rigorous secondary containment and spill control are essential.

Common questions

Can I store liquid bromine in a polyethylene tank?

No. Bromine attacks polyethylene and most common plastics; published resistance data rate poly as "not recommended" for bromine. There is no poly-tank option - containment requires specialist materials such as glass, lead-lined steel, or PVDF/PTFE fluoropolymer linings.

What materials are actually used to contain bromine?

Specialist containment: glass or glass-lined steel, lead-lined steel, PVDF (Kynar) and PTFE (Teflon) fluoropolymer linings, and - for DRY bromine only - nickel alloys such as Monel 400 and Hastelloy. Wet bromine is far more corrosive and rapidly attacks those alloys, so the material choice depends on moisture content.

Why does bromine's density matter for tank design?

Bromine has a specific gravity of about 3.1 - roughly three times that of water. The same volume weighs much more, so the vessel, its supports, and the secondary-containment volume all have to be engineered for that load rather than sized as if for water.

Is bromine flammable?

Bromine itself does not burn (NFPA Flammability 0), but it is a powerful oxidizer (NFPA special hazard OX). It can ignite combustible and organic materials on contact and reacts violently with many organics and reactive metals, so it must be isolated from fuels and reducers.

What are the main exposure hazards?

Bromine is fatal if inhaled (H330) and causes severe skin and eye burns (H314/H318). Its heavy corrosive vapor is dangerous even at room temperature. Handling demands engineering controls, scrubbing, full chemical PPE, eyewash, and emergency deluge.