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Metal Catalyst

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What are Polyurethane Metal Catalysts?

Metal Catalysts is an organometallic compound—typically based on Tin, Bismuth, or Zinc—functioning as a Lewis acid. It operates by forming a coordination complex with both isocyanate and hydroxyl groups, exponentially accelerating the gelling reaction (urethane bond formation) rather than the blowing reaction.

Ming Xu metal catalysts exhibit a decisive impact on the final cure and tack-free time when we compare them to standard tertiary amine catalysts. While amines are primarily used to regulate the foam rising profile, our metal series is essential for establishing the final cross-linking density and maximizing the mechanical strength of the polymer network.

Clear liquid MXC-B20 (CAS 7560-83-0), N-Methyldicyclohexylamine catalyst in a glass beaker for rigid polyurethane foams

MXC-B20

MXC-B20 (CAS 34364-26-6) is a high-performance, bismuth-based gelation catalyst that offers an eco-friendly alternative to organotin, providing a unique delayed

Amber liquid MXC-T120 (CAS 1185-81-5) organotin catalyst in a beaker, known for excellent hydrolytic stability in polyurethane

MXC-T120

MXC-T120 (CAS 1185-81-5) is a high-purity organotin mercaptide catalyst that provides superior controlled reactivity and exceptional hydrolytic stability for microcellular

Clear liquid MXC-15 (CAS 3164-85-0), Potassium Octoate trimerization catalyst for PIR rigid polyurethane foams

MXC-15

MXC-15 (CAS 3164-85-0) is a high-performance trimerization catalyst that optimizes the isocyanurate reaction to enhance thermal stability and flame retardancy

Clear liquid MXC-T12 (CAS 77-58-7), Dibutyltin dilaurate (DBTDL) strong gel catalyst for polyurethane and CASE applications

MXC-T12

MXC-T12 (CAS 77-58-7) is a high-purity organotin gel catalyst and heat stabilizer that provides superior reaction speed in polyurethane systems

Types of PU Metal Catalysts

Polyurethane foam production requires precise control over the gelling reaction and surface curing. To meet diverse formulation needs, our metal catalysts are classified into three main types:

  • Tin Catalysts: Deliver high reactivity to powerfully drive the gelling reaction and maximize polymer structural strength.

  • Bismuth Catalysts: Provide an eco-friendly, delayed-action profile to extend working time followed by a rapid snap-cure.

  • Zinc Catalysts: Ensure uniform cross-linking from core to skin to optimize surface curing and eliminate tackiness.

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Types of PU Metal Catalysts

Polyurethane foam production requires precise control over the gelling reaction and surface curing. To meet diverse formulation needs, our metal catalysts are classified into three main types:

  • Tin Catalysts: Deliver high reactivity to powerfully drive the gelling reaction and maximize polymer structural strength.

  • Bismuth Catalysts: Provide an eco-friendly, delayed-action profile to extend working time followed by a rapid snap-cure.

  • Zinc Catalysts: Ensure uniform cross-linking from core to skin to optimize surface curing and eliminate tackiness.

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Cure Optimization & Surface Quality

In flexible slabstock foam, Ming Xu stannous octoate (T-9 equivalent) controls the critical tack-free time and ensures uniform curing from the core to the skin, minimizing density gradients. For CASE (Coatings, Adhesives, Sealants, Elastomers) applications, our Bismuth and Zinc series offer a controlled pot-life followed by a “snap-cure” behavior, providing an environmentally compliant alternative to mercury and lead-based catalysts without compromising mechanical hardness.

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