There are two main categories of Cast Polyurethane Prepolymers：Polyester type polyurethane prepolymer and PPG type are two common types . Both materials have their advantages and disadvantages, but they have proven to be reliable and essential materials in the manufacturing industry.
The polyester type PU products are known for their exceptional tensile strength, tearing strength, abrasion resistance, and oil resistance. These properties make them perfect for use in applications where mechanical loads are high and frequent. With proper maintenance, polyester PU products can withstand the test of time, even in harsh conditions.
On the other hand, PPG type PU products have a higher hydrolysis resistance, which means they can withstand prolonged exposure to moisture and remain stable. This makes them suitable for use in outdoor settings or where water resistance is essential. However, PPG type PU products may have lower tensile strength and less resistance to oil, which limits their application and usage.
It is essential to know the limitations and advantages of both types of PU materials to make the right choice for the intended application. Despite their shortcomings, polyester type and PPG type PU products have proven to be reliable options in the manufacturing industry, contributing greatly to the progress of various fields.
In conclusion, the properties of polyester type polyurethane prepolymer and PPG type have their own strengths and limitations. Rather than focusing on their shortcomings, it is best to focus on their advantages and choose appropriately based on the intended application. These materials have proven their worth and will continue to be essential materials for years to come.
