The impact resistance of EPE foam material with a recycled content of 30% -40% is comparable to that of raw materials, providing empirical evidence for packaging cycle design

Research background and testing methods: In the process of transforming protective packaging into recycled materials, whether recycled foam materials can meet the strict impact attenuation requirements requires reproducible experimental evidence. A study published in the Wiley journal evaluated the dynamic buffering performance of foamed polyethylene (EPE) containing 0%, 30%, and 40% recycled materials according to ASTM D1596 standard. A total of 1100 drop tests were conducted, covering representative combinations of density, thickness, static load, and drop height in the express and freight supply chains, with peak transfer acceleration (G) as the main performance response indicator.

Key Data and Findings

Test results show that within the evaluated configuration range, the cushioning performance of EPE foam materials containing recycled materials is comparable to that of native materials.

. Among them, the formula with 30% regeneration content showed lower average peak transfer acceleration and smaller variance under controlled conditions, but the study clearly indicated that this difference depends on the specific configuration and cannot be interpreted as a universal performance improvement. Multivariate regression analysis confirmed that regeneration content was a statistically significant predictor of peak acceleration reduction after controlling for geometric dimensions, density, drop height, and static load, while thickness and impact strength remained the dominant factors in buffering behavior. The thickness increased from 2.5 centimeters to 5.1 centimeters, and the peak acceleration decreased by more than 70 G, highlighting the primary role of geometric design in impact mitigation.

The significance of polymer additives and packaging materials industry

This study provides design related evidence for the application of recycled materials in cushioning packaging, indicating that moderate recycled content levels (especially 30% commercial formulations tested) can introduce EPE foaming systems without sacrificing protective performance.

. For the packaging materials industry, this means that in the cushioning design of food contact and daily chemical packaging, the use of recycled materials is no longer necessarily linked to performance degradation, which helps reduce reliance on native plastics. In the processing stage, the introduction of recycled materials usually requires attention to the matching of processing stability and antioxidant system to ensure consistency between the foaming process and the final product performance; Although this study did not directly involve the formulation of additives, its quantification of the relationship between regeneration content and dynamic buffering performance provides a reference performance boundary for the stable control of regeneration materials in foaming packaging processes. With the increasing demand for recyclable designs, such empirical data will support packaging companies in promoting the adoption of recycled materials while maintaining integrity protection.

Information source:Dynamic Cushioning Performance and Sustainability Implications of Recycled‐Content Expanded Polyethylene Foams， Organized by Herun Chemical.