Carbon black peaked in September 2026: what the reversal means for masterbatch buyers

Carbon black ran to an all-time high in mid-September 2026 and has now turned down. For anyone buying black masterbatch the useful question is not where the price is today, but which number leads it — and how much of the fall you are actually entitled to.

By Zoe Lin, Export Manager, E-LUCK (Guangdong Yijuyuan Plastic Industry Technology Co., Ltd.)

Where it stands

The single-week gain in September exceeded 50%, a record for the industry. That is the shape of a supply shock, not a demand cycle — and shocks unwind.

The numbers are falling fastest at the point of sale

Regional N330 quotes from market reporters show the turn more sharply than any national index, because they capture what deals are actually being done at:

Market commentary accompanying those numbers is uniformly bearish: new orders weak, buyers pressing for lower prices, and further downside expected. Note the spread — up to CNY 1,200/t between the strongest and weakest region for the same grade on the same days. If you are told there is “one carbon black price”, that is already a simplification.

What led it up, and what leads it down

Coal tar is 65–80% of the cost of carbon black in the oil-furnace process, so it is the variable that explains most of the move in both directions:

• The run up: coal tar in East China reached CNY 6,720/t on 15 September, up 46.09% from the start of the month, with a one-week gain that was itself a record. The cause was upstream — coal mines under safety and environmental scrutiny recovered more slowly than expected, coking plants under losses cut operating rates, and coal tar availability contracted.
• The turn: by 28 September the coal tar market was described as weak with thin actual trading, coking plant utilisation edging back up and supply loosening, while downstream deep-processing and carbon black plants cut their own operating rates and stopped buying. Jilin settled CNY 800–910/t lower in a single adjustment. The read-through was explicit: further downside in the near term.

This is the number to watch. If you want to know where your masterbatch price is going next quarter, follow the coal tar market, not last week's carbon black quote. In this cycle coal tar moved first in both directions.

Where carbon black actually goes — and where masterbatch sits

It is worth knowing how small your corner of this market is, because it explains why your supplier’s price discipline will be nothing like the tyre industry’s:

Plastics colouring is a slice of that last 10%. Two consequences follow. First, when carbon black is short, the tyre industry — buying in kilotonnes on annual contracts — gets served first and sets the tone. Second, the grades sold into colouring are not where the growth is: conductive carbon black for lithium battery conductive agents and high-voltage cable shielding is growing at 14.6%, and low-rolling-resistance grades have moved from 19% of green-tyre usage in 2023 to 31% in 2026. Rubber-grade capacity is the part under structural pressure, while speciality grades are where investment is going.

Supply side, for context: carbon black was brought into China’s programme for upgrading obsolete petrochemical plant (2026–2029, seven ministries, April 2026), which accelerates the exit of units below 50,000 t/yr — while total rubber-grade capacity still stood at 9.766 million t/yr at the end of June 2026, with first-half output up 8.3% year on year. The constraint has been effective operating rates, not nameplate capacity.

What the reversal means if you buy black masterbatch

• Do not expect the fall to arrive at the same speed as the rise. A masterbatch maker holds carbon black inventory bought at earlier prices, and a quotation is a dated document with a validity window. A quote issued at the peak stays at the peak until it expires. The correct action is to ask for a fresh quote and to say when the old one was issued.
• Pass-through is proportional to carbon content, not to the headline move. This is the most useful lever you have. If a grade is 40% carbon black by mass, a CNY 1,000/t move in carbon black moves its material cost by roughly CNY 400/t — not CNY 1,000/t. Ask for the carbon content of the grade in writing, then do that arithmetic before accepting any increase.
• Put a formula in the contract before the next spike. Name the index, name the grade, name the review period. A price that drifts with no stated reference is unattractive in both directions: you cannot challenge an increase, and you cannot claim a decrease.
• Watch ash when prices fall. The incentive to substitute mineral filler rises exactly when carbon gets expensive and does not disappear the moment it gets cheaper. Ash content is what separates genuine carbon loading from carbon plus filler. Our note on carbon black content testing covers how to check it.
• Treat the peak as a specification review, not just a cost event. A price shock is the natural moment to re-confirm carrier resin, carbon loading and dispersion data, because those are the variables that quietly change when a supplier is managing a margin.

One correction worth having on file

Some commentary circulating about this price spike attributes it partly to the EU’s Carbon Border Adjustment Mechanism imposing carbon-footprint accounting on imported carbon black. That is not correct. CBAM’s definitive phase did begin on 1 January 2026, but its scope is six sectors — iron and steel, aluminium, cement, fertilisers, hydrogen and electricity. Carbon black is not a CBAM good. The Commission has proposed extending CBAM to around 180 steel- and aluminium-intensive downstream products from 2028; again, not carbon black. If a supplier or a consultant tells you otherwise, ask for the CN code and check it in the TARIC database.

October update: the reversal is confirmed, and producers are pushing back

Two weeks on, the turn has held and the picture has sharpened. The price is still drifting down, but the producers now have a cost problem of their own — and that sets a floor under how far it can fall.

Note what has happened to N330 in Shandong: it was quoted around CNY 11,200/t in the third week of September and is CNY 9,800–10,200/t at the end of the month. That is a fall of roughly CNY 1,000–1,400/t in ten days at the point of sale — much faster than the national index suggests, which is exactly why regional quotes are the number to ask for.

The squeeze is now on both sides of the producers

Carbon black makers are running on coal tar bought at September prices and selling into a falling market, which is why the industry association’s September estimate is an aggregate loss of over CNY 120 million and most producers are described as loss-making or barely profitable. The response is a stated intention to hold and push prices up, not to compete downward. Two consequences for a buyer:

• The fall has a floor that is cost-driven, not demand-driven. Producers losing money at current coal tar costs will not chase volume with price. Expect them to run units below capacity rather than sell at a loss — which is what the 66% industry operating rate already indicates.
• Do not read the index fall as your new price. A CNY 1,400/t fall in regional N330 does not equal a CNY 1,400/t fall in your masterbatch, and it certainly does not arrive the same week. Apply the carbon-content arithmetic above to your own grade.

The downstream signal: tyres pushed prices up again

There is a second, less obvious read-across. China’s tyre industry entered October executing its fourth round of collective price increases this year, with major producers raising full-steel, semi-steel and OTR tyre prices by 2–5% from 1 October. The stated reason is raw material cost: tyres are more than 70% raw material by cost, and natural rubber, synthetic rubber and carbon black together account for over 60% of it.

That matters to a masterbatch buyer for one reason: it tells you the largest consumer of carbon black is passing cost through rather than absorbing it. When the 70% of the market that buys in kilotonnes is raising prices, small-volume buyers should not expect to be offered a better deal than the tyre industry gets. The realistic ambition is not to beat the market — it is to make sure you are not paying peak prices for material bought at post-peak cost.

The related rubber numbers, for context: natural rubber settled above CNY 20,000/t on the Shanghai futures close at the end of Q3 with spot averaging about CNY 19,400/t, up 31% year on year; butadiene rubber stood at CNY 16,220/t (+39%) and styrene-butadiene rubber at CNY 16,175/t (+36%). Rising rubber prices do not directly move masterbatch cost, but they do mean the compounding sector as a whole is under margin pressure, and that is the environment your supplier is quoting in.

The 11 October position: the reversal is confirmed, and a correction

Ten days on, we have a sharper picture and one correction to make. The short version: carbon black did fall again, and more than we had described — but the fall stopped in the second week of October, and the reason it stopped is the cost.

Two readings of the same number, both correct

The national benchmark remains 59.74% above a year ago and at a six-year high, while falling about 0.85% a week. Regional N330 has come down roughly CNY 1,500/t from the mid-September peak. Nothing contradictory: the benchmark aggregates across grades and regions, the Shandong figure is a delivered price for one grade, and the two are not the same measurement.

Why the fall has a floor

Coal tar is 70–80% of carbon black cost and it did not fall. Shandong high-temperature coal tar rose about 45% cumulatively through September, which Sci99 converted into CNY 3,000–4,000 per tonne of added cost. Producers were already carrying an aggregate loss of over CNY 120 million in September, and their response to a soft market was to cut output rather than compete on price — semi-steel tyre utilisation fell 10.44 percentage points week on week.

Meanwhile their largest customers signed off on increases of their own: more than 20 tyre companies raised prices during the National Day holiday, nine of them a second increase in a short window, at 2–5% and up to 6% on some grades, effective 1 October.

What this changes for a buyer

• Do not wait for the bottom. A cost-driven floor plus a customer base that has already accepted an increase is not a market that clears on sentiment.
• Do not expect a pigment fall to become a price fall of the same size. At 30–65% loading, pigment is a fraction of your cost; carrier resin is the other part and it has been rising.
• Ask for a validity period. With feedstock moving 45% in a month, an open-ended quotation is a commitment without a price.

The full treatment of this position, including what it means for a specific grade, is in Carbon black is falling but the cost is not.

Outlook

The published view from Chinese industry analysts is a wide high-level range in Q4 2026, with limited further upside and a real possibility of a fast retreat toward CNY 9,000/t if coal tar tops out — which, on the 28 September reading, it may already have done. For 2027–2030 the expectation is a structurally higher band, around CNY 8,500–11,000/t, driven by capacity exits and consolidation rather than by demand growth: the top five producers already hold roughly 55% of the market.

Our own position is unchanged. We quote against the prevailing market, state a validity period on every quotation, and tell you what we have assumed. If you want a fixed figure over a longer horizon we will structure it and show the assumption — which is more useful to you than a price that appears stable and then moves without explanation.

Questions buyers ask

Related

• Carbon black is falling but the cost is not — the 9 October position, and why the fall has a floor
• Carrier resin in October 2026 — the other half of the cost, which is not falling
• Carbon black price surge, September 2026 — the first brief in this pair, written at the peak
• Carbon black content testing in PE — the ash check that reveals filler substitution
• Black masterbatch pricing — what drives cost per kilogram
• What drives a factory quote — the five decisions behind a price

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