Capacity LedgerA Derivatives Plant Is Only as Good as Its Monomer
Covestro closed on the former Vencorex site at Freeport, Texas on July 1. The plant has made Tolonate since 1988; what changed is who makes the HDI going into it.
There is a plant at Freeport, on the Texas Gulf Coast, that has been making Tolonate since 1988.
It has changed corporate parents three times since 2008. Perstorp bought the isocyanates business that year, the Vencorex joint venture was built around it in 2012, and PTT Global Chemical took it outright in 2022.
On July 1 it changed hands again, and this one is worth a few minutes if you buy aliphatic polyisocyanate anywhere in North America.
Covestro completed the purchase of the two former Vencorex derivatives sites, Freeport and Rayong in Thailand, on July 1, 2026. Price undisclosed by mutual agreement, the same terms as when the deal was announced in August 2025.
The plant is still running. What moved is the address of the molecule going into it (chart below).
What Freeport Actually Makes
Freeport is a derivatives plant. HDI arrives, polyisocyanate leaves: the Tolonate range since 1988, plus a waterborne Easaqua chain that Vencorex built there as part of its 2014 investment program and announced complete in January 2017.
These are the hardeners in two-component polyurethane. Automotive coatings, protective coatings on infrastructure, marine, wood furniture, electronics.
Covestro's own Desmodur N 3300 is an HDI trimer sold into the same formulations, which tells you how directly the two ranges sit alongside each other.
Which leaves the site with one input that decides whether it runs at all.
Where the Monomer Used to Come From
Vencorex made HDI monomer in exactly one place.
Pont-de-Claix, in the Grenoble region, first monomer in 1978. The same 2014 program that built out Freeport's waterborne chain added 70,000 metric tons a year of HDI and IPDI monomer capacity there, on stream by mid-2016.
That upstream is finished. Vencorex France entered judicial recovery in September 2024, the French isocyanate derivatives business went to BorsodChem in the Wanhua group, and the remaining Pont-de-Claix operations ceased permanently in 2025.
So the two derivatives plants that survived the estate, Freeport and Rayong, went to market as what they had always been: converters with no monomer of their own.
The Buyer That Had the Monomer
Covestro makes HDI at Baytown, Texas, along with IPDI, Desmodur W and Desmodur Z, on the site that is its largest in the Americas and its third largest anywhere in the world.
Two plants, one owner, one Gulf Coast. One of them makes the monomer and the other converts it.
Thomas Roemer, who runs Covestro's coatings and adhesives business, put the corporate version plainly on closing: "By adding these sites in Thailand and the US, we are strengthening our regional production capabilities and improving our ability to supply customers from locations close to them."
Read it from a sourcing desk and it says something narrower and more useful. For the first time in the plant's thirty-eight years, the monomer behind those Freeport hardeners is made in the same state.
What to Do With It
- Grade continuity is the question to put in writing. Tolonate and Easaqua grades carry qualification histories at your customers, and integrations are where grade codes get rationalized. Ask which codes survive and on what timeline, before your next requalification cycle rather than after.
- Use Rayong for scale calibration. That unit opened with 12,000 metric tons a year of Tolonate capacity, which is the order of magnitude a derivatives train of this type runs at. Worth having in your head the next time someone describes an aliphatic shortage to you.
- The uncertainty window is shut. Covestro announced on August 14, 2025 and expected to close by the end of that year; it landed on July 1, 2026. Anyone holding Freeport grades carried a second source through two extra quarters for a reason that no longer exists.
Final Thoughts
We count subtractions here, and most weeks subtraction is all there is to count. This one belongs in the other column.
Nothing about it adds a tonne of nameplate. The reactors at Freeport are the reactors they were in June and the grades are the grades.
What changed is that a plant stopped being the last loose asset in a dissolving estate and became one node in a chain whose upstream sits on the same coast.
Capacity you keep is worth every bit as much as capacity you build, and it almost never gets written up anywhere. That is most of the reason we keep the ledger.
Thanks for reading.