How to Choose TPE Materials That Meet Heat and Aging Resistance Standards? Recommendations from a Long-Established Modification Manufacturer

As TPE materials find increasingly widespread application in high-temperature environments—such as automotive engine compartments, heat dissipation components for electronics and appliances, and industrial seals—overcoming temperature resistance limitations has become a key focus for many formulation development efforts. However, the formulation design of high-temperature TPEs is not simply a matter of combining raw materials; rather, it is a systematic process that balances molecular structure control, chemical protection, and physical reinforcement.

To scientifically select the most suitable solution, you can proceed step by step across four dimensions. In this article, Zhongsu Wang’s editorial team shares these insights with you.

The first step in developing a successful formulation is selecting the right combination of high-temperature-resistant base resins and elastomers, as this forms the core foundation that determines the material’s upper temperature limit. For conventional polyolefin-based TPEs, high-crystallinity PP or PE is preferred as the hard segment phase, relying on the rigid structure of the crystalline regions to maintain shape and structural integrity at high temperatures; for the elastomer portion, SEBS with a higher degree of hydrogenation is used in place of standard SBS to enhance thermal oxidation resistance through its saturated molecular chains. If the application requires even higher temperature resistance, high-temperature-resistant elastomer components such as EPDM or ACM can be incorporated, or specialty TPEs can be selected. By increasing the proportion of the cross-linked rubber phase and introducing rigid groups, the material’s heat deflection temperature can be further elevated.

After selecting the base material, the next step is to establish a suitable antioxidant and thermal stabilizer system, which is key to delaying the degradation of the material’s high-temperature performance. In conventional formulations, hindered phenol primary antioxidants and phosphite secondary antioxidants can be used in combination to delay the oxidative degradation of molecular chains by trapping free radicals and decomposing hydrogen peroxides. For chlorinated or hydrolyzable TPE grades, metal soap or organotin heat stabilizers can be specifically added to suppress thermal decomposition reactions during processing and use, thereby maintaining the material’s structural integrity at high temperatures.

In addition to chemical protection, a physical barrier can be established using heat-resistant fillers to further enhance high-temperature stability. By incorporating fillers such as carbon black, nano-zinc oxide, or nano-montmorillonite into the formulation, their layered barrier effect slows the penetration of oxygen and heat into the material’s interior. At the same time, these fillers absorb ultraviolet radiation and rapidly dissipate localized heat, thereby reducing the rate of photo-thermal synergistic aging. For structural components requiring higher rigidity and heat resistance, glass fiber can also be added in appropriate amounts for supplementary reinforcement.

Finally, the plasticizer system must be optimized, and measures to prevent oil bleeding must be implemented. High-temperature environments can easily cause low-molecular-weight substances within the TPE to volatilize and migrate, leading to sticky surfaces, hardening, or even failure of the finished product. In the formulation, prioritize high-viscosity, high-flash-point paraffin oil or high-molecular-weight polyolefin plasticizers, while carefully controlling the oil loading. Combine this with highly adsorbent materials such as nano-silica to trap free small molecules, thereby preventing oil bleeding under high-temperature exposure or thermal cycling and ensuring the stability of the product’s appearance and tactile feel.

In summary, the core of high-temperature TPE formulation design lies in finding the right balance between heat resistance, mechanical properties, and processing costs. From substrate selection and the development of an antioxidant system to the reinforcement of physical barriers and optimization to prevent oil bleeding, meticulous control of every detail ultimately affects the long-term reliability of the finished product under high-temperature conditions. In actual R&D, engineers can flexibly combine these strategies based on target temperature resistance specifications and specific operating conditions to formulate solutions with greater adaptability.