The choice of polyurethane catalyst depends on many factors, including:

Desired Properties of Polyurethane Products
Use Temperature of Polyurethane Products
Catalyst Cost
Catalyst Availability
Manufacturer’s Reputation
Consult a Polyurethane Specialist for the Best Catalyst for a Specific Application recommendations are also important.

Here are some of the most common types of polyurethane catalysts:

Tin carboxylate: Tin carboxylate is the most widely used polyurethane catalyst. They are effective over a wide temperature range and are relatively inexpensive. However, they can be toxic and cause environmental problems.
Amines: Amines are another common polyurethane catalyst. They are less toxic than tin carboxylates and are less likely to cause environmental concerns. However, they don’t work well over a wide temperature range and can be more expensive.
Bismuth carboxylate: Bismuth carboxylate is a relatively new type of polyurethane catalyst. They offer several advantages over tin carboxylates and amines, including lower toxicity and lower environmental impact. However, they are more expensive and not widely available.
The following are some factors to consider when choosing a polyurethane catalyst:

Desired Properties of Polyurethane Products: The properties of a polyurethane product will depend on the application. For example, polyurethane products to be used in food contact applications need to be food grade.
Polyurethane product service temperature: The service temperature of the polyurethane product will affect the type of catalyst required. For example, polyurethane products that will be used in high temperature applications require catalysts that are stable at high temperatures.
Cost of the catalyst: The cost of the catalyst will vary depending on the type of catalyst and the manufacturer. When selecting a catalyst for a particular application, it is important to consider the cost of the catalyst.
Catalyst Availability: Catalyst availability will vary by catalyst type and manufacturer. Before selecting a catalyst for a particular application, it is important to ensure that the catalyst is available.
Reputation of the manufacturer: The reputation of the manufacturer is important because it affects the quality of the catalyst. It is important to choose a catalyst from a reputable manufacturer.
It is also important to consult a polyurethane expert for advice on the best catalyst for a particular application.