CUCAT-HS is an effective catalyst for the reaction of isocyanates and polyols with hydroxyl groups used in the production of cast elastomers. It is a specially formulated to be an alternative to mercury catalysts without the toxicity concerns. It can pass China and EU environmental regulations.

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Product Model: CUCAT-HS

Typical Properties:

Appearance: Clear, light yellow transparent liquid

Chroma (APHA): ≤320

Density (g/cm3, 25℃): 1.09

Viscosity (mPa.s, 25℃): 144

Solubility: Soluble in normal polyurethane raw materials (polyether polyol, plasticizer)



CUCAT-HS is a wide applicable catalyst recommend to use in 2-component polyurethane system, provides gel times and cure properties similar to mercury catalysts. It can be used in diverse PU CASE applications.  Recommend to apply in two-component sealants, binders, coatings, etc. Additionally, it will be more stable in conjunction with CUBD-WB.


Features & Advantages:

CUCAT-HS is formulated for non-bubble requirement in PU CASE applications using alcohol as curing agent in MDI system. The unique characteristics are following:

▶ Restrain the reaction of isocyanates and water.

CUCAT-HS can obviously restrain the reaction of isocyanate and water, directionally catalyzing isocyanates and polyols with hydroxyl groups. It performs well to effectively prevent the CO2 bubbles formed. Therefore, the cured-surface problems, including pinhole, cracking, bulging, peeling, can be solved visibly.

▶ Specially formulate for alcohol curing agent in MDI system.

CUCAT-HS can orderly catalyze the reaction between hydroxyl groups and isocyanate groups. For MDI-alcohol curing system, CUCAT-HS is added in the component of PTMG or other polyhydric alcohols and BDO. It performs super catalytic activity as well as operation stability. Also, it can improve anti-scratch of the PU surfaces, significantly reduces the shrinkage rate, enhance surface gloss and dirt-resistance.

▶ Provide long pot life and high catalytic activity at later curing reaction stage

CUCAT-HS can provide long pot life although the curing time is quite short. The demould time is only 10 to 15 minutes. After then 45 to 120 minutes post-vulcanization at 80ºC, or even at room temperature, it can achieve expected hardness.

CUCAT-HS is recommended to use in MDI-BDO curing system. It is not allowed to apply in the MDI-DETDA or MDI-MOCA systems.


User’s Guide:

♢ Suggest adding in polyol component after vacuum degassing.

♢ Levels of 0.1-0.5% as supplied by weight on total polyol volume.


Handling & Storage:

CUCAT-HS is sensitive to moisture. There, exposure to atmosphere should be avoided. Product should be stored in a cool, dry environment away from sunlight and excessive heat.


Package: 25kg/200kg in HDPE drum


Shelf Life: The unopened shelf life is 12 months from the date of manufacture

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