The Acetone Squeeze of 2026: Why a “Weak” Year Sent Prices to a Two-Year High

Everyone forecast a soft, oversupplied year for acetone. Instead, US spot prices ran to a two-year high and buyers found themselves in a seller’s market. The reason isn’t a demand boom — it’s a quirk of how acetone is made. Here’s the buyer’s briefing.

Update, October 28, 2026: On October 15, Covestro announced it intends to cut polycarbonate production at its Antwerp, Belgium site from four lines to one and to stop making bisphenol-A (BPA) there, pending consultation with employee representatives. BPA is the largest single outlet for phenol, so this is the co-product mechanism described below happening at a named plant. See what one tonne of BPA does to the acetone balance.

What’s actually happening in the acetone market

Short answer: US acetone supply tightened sharply through early 2026, pushing spot values to about $1,547/MT FOB US Gulf Coast in April — the highest since February 2024 — even though the year was expected to be weak.

Coming into 2026, most outlooks called for ample acetone and lukewarm demand. That flipped. A combination of production outages, firm export pull from Europe and Latin America, and elevated aromatic feedstock costs turned a “weak” year into what traders described as a seller’s market. At least one supplier was reported sold out into mid-year, and the tightness is widely expected to persist for roughly the next six months.

For anyone who buys acetone as a solvent — coatings and adhesives, parts cleaning and surface prep, resin and composite work, cosmetics, or lab use — the practical result is longer lead times, thinner spot availability, and quotes that move week to week.

Why acetone is a “co-product” (and why that matters)

Short answer: More than 95% of acetone is produced as a by-product of phenol through the cumene process. Every tonne of phenol drags along roughly 0.6 tonnes of acetone — so acetone supply is set by phenol production rates, not by acetone demand.

The cumene process is the workhorse of the aromatics world. Benzene and propylene combine to make cumene; cumene is oxidized to cumene hydroperoxide; and an acid cleavage step splits that molecule into two products at once — phenol and acetone. Because they come out of the same reaction, they are chemically joined at the hip. Producers don’t decide how much acetone to make; they decide how much phenol to make, and the acetone follows in a fixed ratio.

That ratio is the whole story. In 2024, the world made more than 9.5 million tonnes of phenol and, alongside it, more than 6.2 million tonnes of acetone — not because 6.2 million tonnes of acetone were ordered, but because that’s what the phenol run yielded.

The paradox: scarce because of a glut next door

Short answer: When phenol demand is soft, producers cut cumene run rates — and acetone, riding along as the by-product, gets scarce even in an oversupplied year.

Phenol’s single largest end use is bisphenol A (BPA), the building block for polycarbonate plastics and epoxy resins — together roughly 30–35% of phenol demand. When construction, electronics, and durable-goods demand cools, BPA and polycarbonate orders soften, and phenol margins compress. Producers respond by trimming cumene throughput.

Here’s the twist: cutting phenol output also cuts the acetone that would have come with it. So a market that looks “long” on paper — plenty of nameplate capacity, tepid demand — can still leave acetone physically short at the tank. Acetone didn’t get scarce because the world suddenly wanted more of it. It got scarce because the world wanted less phenol, and acetone was collateral.

October 2026: what a BPA closure does to the acetone balance

Short answer: One tonne of BPA uses about 0.82 tonnes of phenol but only about 0.25 tonnes of acetone, while the cumene process made roughly 0.5 tonnes of acetone alongside that phenol. BPA is a big part of why there is spare acetone for solvent buyers in the first place, so closing BPA capacity moves both sides of the acetone balance at once.

Covestro's October 15 release says it intends to "consolidate polycarbonate production from four lines to one" at Antwerp and "discontinue local production of the polycarbonate precursor Bisphenol-A (BPA)". The company cites "persistent global overcapacity in standard polycarbonates" and says the Antwerp operations "have been increasingly loss-making since 2022". Up to 260 of about 970 site employees could be affected. It is an intention, not a final decision: "No final decision will be taken before this process has been completed and its outcome carefully considered."

The chemistry is a two-to-one versus one-to-one mismatch. Cumene cleavage makes phenol and acetone one molecule each. BPA is made by condensing two phenols with one acetone and releasing water (C15H16O2, 228.3 g/mol). So the phenol that goes into BPA arrives with twice the acetone that BPA can use, and the other half has always had to find a home in solvents, coatings, methyl methacrylate and other outlets.

What a BPA closure does next depends on the phenol, and that is a decision for phenol producers, not Covestro. If the phenol keeps running and finds another buyer, acetone output does not change while acetone demand drops by about 0.25 tonnes per tonne of BPA not made, and the region has more acetone looking for a home. If phenol producers instead trim cumene runs to match, acetone output falls by about 0.5 tonnes while demand falls by 0.25, and the acetone balance gets about 0.25 tonnes tighter per tonne of BPA. The release does not say which will happen, and neither do we.

For a US buyer, Antwerp is an ocean away. The point is the mechanism: a polycarbonate decision in Belgium is also an acetone decision, which is why acetone forecasts that look only at solvent demand can miss. This section describes the European market and Covestro's announcement, not our own supply chain; Alliance Chemical makes no claim about ours.

What the squeeze means for buyers

Short answer: Expect week-to-week price movement and tighter spot volumes into the second half of the year. Know exactly which grade you actually need, and consider whether isopropyl alcohol can cover part of your solvent duty.

Not every job needs the same acetone. Buying the right grade — rather than defaulting to the highest — protects both budget and availability during a squeeze (our acetone guide covers what separates ACS from technical grade):

Updated October 28, 2026 with the Covestro Antwerp announcement. Isopropyl alcohol is not a drop-in replacement for acetone in every application (see the acetone vs isopropyl alcohol comparison) — evaporation rate, solvency, and material compatibility differ. Match the solvent to the job, and confirm compatibility before switching.

How to protect your supply during the squeeze

Short answer: Confirm the grade and specification you truly need, ask for the certificate of analysis up front, and line up a supplier who can quote and confirm quickly rather than leaving volume to the spot market.

1. Pin down the spec. Know whether your process genuinely needs ACS grade or whether technical grade meets the requirement. Over-speccing wastes money and shrinks your available pool in a tight market.
2. Request the CoA. A certificate of analysis tells you exactly what is in the drum — identity, purity, and key limits — so you’re buying a verified spec, not a label.
3. Right-size the order. Bottles, cases, pails, drums, and totes each carry different lead-time and price dynamics; matching pack size to real throughput smooths out spot exposure.
4. Keep a substitution plan. Where the chemistry allows, knowing which alternative solvent can cover part of your duty gives you a lever when acetone is short. MEK vs acetone walks through one common swap.
5. Work with a stocking distributor. A fast quote-to-confirmation turnaround matters more when the commodity market is volatile than when it’s calm.