Carrier resin in October 2026: the other half of your masterbatch cost
Carbon black has turned down from its September peak. Carrier resin has not. Since a black masterbatch is carbon black plus carrier plus a small additive package, a buyer who tracks only the carbon black price will misjudge where their cost per kilogram is actually going.
By Zoe Lin, Export Manager, E-LUCK (Guangdong Yijuyuan Plastic Industry Technology Co., Ltd.)
Where carrier prices stand
Chinese benchmark prices for the resins used as masterbatch carriers, as published on 1 October 2026:
| Resin | Benchmark (CNY/t) | Month on month | Year on year |
|---|---|---|---|
| HDPE | 10,475 | −1.3% | +32.4% |
| LDPE | 12,133 | — | +26.4% |
| LLDPE | 9,390 | — | +29.7% |
| PP (raffia grade) | 9,933 | — | +43.6% |
| PVC | 4,865 | — | +5.6% |
Read the last column before the others. On a year-on-year basis carrier resins are up 26–44%, while the month-on-month moves are close to flat. This is a high plateau, not a spike — which is the opposite of the carbon black chart, where the move was fast in both directions.
The Chinese market went into the holiday firm, not soft
China’s National Day break is normally a moment when sellers discount to clear stock before a quiet week. That did not happen this year, and the reason is worth understanding:
- Polyolefin inventories at Sinopec and CNPC went into the break above the five-year seasonal average.
- Offers were nevertheless raised rather than discounted. The explanation is structural: with trucks and logistics still running through the holiday, converters have been holding unusually lean stocks and material kept moving down the chain instead of piling up at the plant gate — removing the usual urgency to liquidate.
- Market analysts note that meaningful post-holiday discounting, when it comes, typically appears in the third week after reopening — and that a wave of new PE and PP capacity is due to come online in the second half of October.
That last point is the one to carry forward. New capacity arriving into a market with already-high inventory is the most likely mechanism for carrier prices to soften into November. It is a supply story, not a demand one.
Elsewhere the picture is mixed. Indian producers opened October with upward revisions across PE and PP grades — HDPE pipe and film up about INR 1,000/tonne, LLDPE high-flow up INR 2,000/tonne, all PP grades up INR 1,000/tonne — while a major Malaysian producer pushed October increases that buyers refused to chase, with traders then clearing material well below the producer’s list price. Crude oil above USD 96/bbl keeps the cost floor in place for everyone.
Why this matters more than the carbon black move
Take a typical 40% carbon black masterbatch. By mass it is roughly 40% carbon black, 50–57% carrier resin and a few percent additives. That means a dollar of carrier resin moves the finished cost about as much as a dollar of carbon black does — and the two are currently moving in opposite directions.
| Scenario | Carbon black | Carrier resin | Net effect on a 40% CB grade |
|---|---|---|---|
| Carbon black eases, carrier holds | −10% | 0% | about −4% |
| Both ease | −10% | −5% | about −6.5% |
| Carbon black eases, carrier rises | −10% | +5% | about −1.5%, before additives |
The arithmetic is deliberately simple, and it is not a quotation — it shows direction, not a price. But it is the reason a supplier can be truthful when saying “carbon black is down” and still not be able to reduce your price by the same percentage.
How to use this in a negotiation
- Ask for the split, not the total. Request the carbon black content and the carrier resin of your grade in writing. With those two numbers you can check any price move yourself instead of accepting an explanation.
- Separate the two indices in any price clause. If a contract reviews price against “the market”, that is not checkable. Name the carbon black index, name the resin grade, and state the review period.
- Watch the new capacity, not the holiday noise. The single most useful input for the next quarter is whether the new PE and PP capacity planned for late October lands on schedule. If it does, carrier cost pressure eases into November.
- Do not let a carrier change pass unnoticed. A supplier managing margin can change carrier resin more quietly than it can change carbon content, and carrier choice is what decides compatibility with your polymer. If the carrier is not specified on the data sheet, ask why.
- Treat this as a specification question too. Higher carrier loading at the same stated carbon content means less carbon per kilogram of masterbatch — which shows up as higher let-down ratio rather than as a lower price. Our note on calculating let-down ratio covers how to catch that.
Our position
We quote the grade, the carrier and the carbon content separately, because those are the three numbers that decide what a kilogram of masterbatch actually does in your process. Where carrier cost has moved, we will show you which resin we are running and what it is doing to the price, rather than folding it into a single figure that can only be argued about.
Questions buyers ask
Why is my masterbatch price not falling when carbon black is falling?
Because carrier resin is roughly half the mass of a black masterbatch and it is not falling. On 1 October 2026 Chinese benchmark carrier resins were still up 26-44% year on year - HDPE +32.4%, PP raffia +43.6% - even though carbon black had turned down from its September peak. A grade that is 40% carbon black will only see about 40% of a carbon black move pass through, by mass.
What share of a black masterbatch is carrier resin?
For a typical 40% carbon black grade, roughly 40% is carbon black, 50-57% is carrier resin and a few percent is additives. That is why carrier cost matters as much as carbon black cost when the two move in different directions.
Will carrier resin prices fall in late 2026?
The most likely mechanism is supply, not demand. Analysts note that a wave of new PE and PP capacity is due to come online in the second half of October 2026, into a market where inventories were already above the five-year seasonal average. Post-holiday discounting in China typically only appears in the third week after reopening.
What should I ask for when a supplier explains a price change?
Ask for the carbon black content and the carrier resin of your grade in writing. With both numbers you can separate a carbon black move from a carrier move and check the arithmetic yourself, rather than accepting a single blended explanation.
Can a supplier change the carrier resin without me noticing?
It can change quietly if the carrier is not specified on the data sheet, and a carrier change affects compatibility with your polymer as well as cost. If the carrier resin is not named on the TDS, ask for it. Substance substitution at the same stated carbon content typically shows up as a higher let-down ratio rather than as a lower price.
Related
- Carbon black is falling but the cost is not — the other half of the cost, in the same week
- EU opens a PVC anti-dumping investigation — policy risk to watch alongside resin cost
- Carbon black peaked in September 2026 — the other half of the cost, and why it turned
- Carrier resin selection: PE, PP and styrenics — how the carrier decides compatibility
- How to calculate let-down ratio — the check that catches carrier substitution
- Cutting black masterbatch cost — where real savings come from