January 21, 2025 – Thermoplastic Polyurethane (TPU) Films: The Unsung Hero in Various Industries’ Heat Resistance Needs
Thermoplastic polyurethane (TPU) films, known for their exceptional physical and chemical properties, play a vital role across numerous industries, ranging from automotive interiors and medical devices to athletic footwear and fitness equipment. Among its myriad attributes, the heat resistance of TPU films is particularly crucial, especially in high-temperature environments.
The heat resistance of TPU films is a complex characteristic determined by various factors, including material formulation, production processes, and the incorporation of special modifiers. Generally, conventional TPU has a long-term use temperature limit of 80°C. Exceeding this temperature significantly reduces its lifespan. However, there are heat-resistant TPU variants capable of enduring temperatures as high as 130°C, and even TPU modified with glass fibers exhibits impressive heat resistance. This means that under normal conditions, TPU films maintain their excellent physical and mechanical properties within a temperature range of -40°C to 80°C.
At AsiaMB, we understand that the heat resistance of TPU films is often evaluated using the softening point, which is the temperature at which the material begins to lose its shape and strength during heating. When it comes to short-term temperature resistance, high-quality TPU films can withstand higher temperatures, with softening points typically ranging from 80°C to 120°C. Once the temperature exceeds the softening point, TPU films gradually soften and may even melt.
For applications requiring even higher temperature resistance, specially designed TPU films are available in the market. These modified TPUs are engineered to enhance their heat resistance limits by adjusting their molecular structure or adding specific components. Studies suggest that using high-purity raw materials and improved polymerization processes can produce TPU films stable in environments ranging from 150°C to 200°C. Furthermore, the incorporation of reinforcing materials like glass fibers has been reported to elevate the heat resistance of some TPU films to 160°C.
It’s worth noting that not all TPUs share the same temperature resistance properties. Different series, such as polyester-based and polyether-based TPUs, exhibit distinct temperature resistance characteristics. Polyester-series TPUs offer better heat resistance, capable of enduring temperatures exceeding 130°C, while polyether-series TPUs are more suited for low-temperature environments and perform less favorably above 90°C.
When selecting TPU films, it’s crucial to consider the specific temperature requirements and other environmental factors to ensure the material performs reliably under the expected operating conditions. In summary, while ordinary TPU films should not be used long-term above 80°C, high-performance TPU films developed for specific applications may offer better heat resistance, depending on the product’s specifications and technical parameters.