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Polyurethane Catalysts

Polyurethane Catalysts & Additives

Amine and tin catalysts control how a polyurethane formulation gels and blows — the reactions that decide cell structure, rise profile and cure speed. Ambizent supplies both catalyst families, matched to your foam system, with a Certificate of Analysis on every shipment.

Catalysts are the fine-tuning dial on every polyurethane foam formulation — they don't change what your foam is made of, but they decide how quickly and how evenly it forms. Ambizent supplies the two catalyst families every foam producer needs: reactive amine catalysts and gel-selective organotin catalysts.

Our catalyst range

Amine Catalyst A33 — 33% TEDA gel/blow catalyst for flexible, rigid and CASE systems.
Stannous Octoate T9 — the standard tin gel catalyst for flexible slabstock foam.

Why balance matters

Polyurethane foam is a race between two reactions: the gel reaction (isocyanate with polyol, building the polymer network) and the blow reaction (isocyanate with water, generating the CO2 that expands the foam). Amine catalysts such as A33 accelerate both; tin catalysts such as T9 are strongly gel-selective. Getting the balance right is what separates a stable, well-formed foam from one that collapses, shrinks or splits — see our guide on troubleshooting flexible foam defects for how an imbalance shows up in practice.

Sourced alongside your isocyanate and polyol

We supply catalysts as part of a matched polyurethane system — alongside TDI, MDI, polyether and polymer polyols — so your formulation is sourced from one accountable partner. Explore our full polyurethane chemicals and additives range.

Frequently asked questions

What PU catalysts does Ambizent supply?
Ambizent supplies both major catalyst families used in polyurethane foam: amine catalysts (such as Amine Catalyst A33) that promote the gel and blow reactions, and organotin catalysts (such as Stannous Octoate T9) that are strongly gel-selective. Most flexible-foam systems use a balanced combination of both.
Why do PU formulations need both an amine and a tin catalyst?
Polyurethane foam relies on two competing reactions — gelling (isocyanate with polyol) and blowing (isocyanate with water). Amine catalysts like A33 accelerate both; tin catalysts like T9 are strongly gel-selective. Balancing the two lets a formulator control cell structure, rise profile and cure speed precisely rather than leaving the reaction to run unchecked.
Can you supply catalysts matched to my isocyanate and polyol?
Yes. We supply catalysts alongside TDI, MDI, polyols and other additives as matched systems, so the whole formulation is sourced from one partner rather than assembled from several suppliers with no guarantee they work together.
Let's Work Together

Need PU catalysts for your system?

Tell us your foam type and target reactivity — we'll recommend a catalyst balance and quote A33, T9 and your isocyanate/polyol as a matched system.

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