Which characteristics apply to Polyester Resin?

Polyester resin is known for its hard and rigid characteristics, making it a popular choice in a variety of applications such as automotive bodywork and fiberglass products. When polyester resin is cured, it achieves a tough and durable structure. However, while it is hard and rigid, it can also exhibit brittleness, particularly if not properly mixed or if other materials are not added to enhance its properties. This brittleness can be a limitation in applications where flexibility is required.

The characteristics of polyester resin that lead to it being hard and rigid are primarily due to the chemical cross-linking that occurs during the curing process. This creates a tight network of polymer chains, resulting in a rigid structure that provides strength but may lack flexibility.