What are the differences in thermal deformation temperatures for these plastics?

Thermal deformation temperature (TDT) is a critical property for plastics, indicating the temperature at which a material begins to soften or deform under load. Different types of plastics exhibit varying TDTs due to their unique molecular structures and compositions.

For example, common thermoplastics like polyethylene (PE) and polypropylene (PP) have relatively low TDTs, typically ranging from 60°C to 100°C. In contrast, engineering plastics such as polycarbonate (PC) and nylon (PA) can withstand higher temperatures, often between 130°C and 150°C. High-performance polymers like PEEK (polyether ether ketone) and PTFE (polytetrafluoroethylene) excel with TDTs exceeding 250°C, making them suitable for extreme environments.

Factors influencing TDT include polymer chain rigidity, crystallinity, and the presence of reinforcing additives. Understanding these differences helps in selecting the right plastic for applications requiring specific heat resistance, ensuring durability and performance under thermal stress.