EPP liners are customized, high-performance cushioning and protective components made from expanded polypropylene (EPP) as the base material through a steam molding process. They are not general-purpose packaging materials, but rather engineering-grade solutions specifically designed for high-value, heavy-duty products requiring long-term reuse in industries such as automotive, aerospace, new energy, and high-end electronics. Thanks to its unique physically cross-linked closed-cell structure, EPP liners combine lightweight design with exceptional impact resistance, heat resistance, chemical stability, and recyclability. As a key alternative to traditional EPS and EVA, they facilitate the transformation of packaging systems from “single-use consumables” to “sustainable assets,” making them a strategic material in modern lean supply chains that delivers the triple benefits of safety, efficiency, and environmental sustainability.
Superior Energy Absorption and Extremely Low Permanent Set: EPP is a physically cross-linked, closed-cell foam that efficiently disperses impact forces under compression and recovers almost completely. After hundreds of drop and vibration tests, its cushioning performance degrades by less than 5%, far outperforming EPS (>30%) and EVA (>15%); it is particularly suitable for the demanding conditions of high-frequency JIT/JIS turnover and automated production lines.
Wide-Temperature-Range Stability and Chemical Inertness: With an operating temperature range of -40°C to +130°C, it withstands the high temperatures of automotive paint lines, cold-chain transportation, and thermal radiation in engine compartments; it is oil-resistant, acid- and alkali-resistant, non-hygroscopic, and mold-resistant, and is compatible with cleaning agents and disinfectants, meeting medical and food-grade cleanliness requirements.
Balance of Lightweight Design and High Rigidity: Density adjustable from 20 to 200 kg/m³; with equivalent protection, it weighs over 60% less than metal or injection-molded dividers; seamless, one-piece molded construction ensures high structural strength, supports multi-layer stacking and robotic handling, and eliminates the risk of disassembly.
Lifecycle Sustainability: 100% recyclable; produces non-toxic fumes when incinerated; manufacturing process is free of CFCs and VOC emissions; long-life design reduces resource consumption, aligning with the automotive industry’s carbon neutrality and ESG compliance requirements.
Automotive Powertrain and Three-Electric Systems: Heavy-duty turnover liners for engine cylinder heads, transmission housings, and battery modules, featuring integrated locating pins, cooling channels, and ESD protection, designed for direct integration with OEM final assembly lines.
New Energy Vehicle Battery Packs: Insulated cushioning separators for battery cells, busbars, and BMS modules, balancing electrical safety, thermal management, and automated assembly interfaces, and adapted to the high-speed cycle rates of battery pack assembly lines.
Aerospace Precision Components: Clean cushioning trays for turbine blades, landing gear assemblies, and avionics equipment, meeting requirements for dust-free environments, ESD protection, and resistance to extreme conditions.
High-End Consumer Electronics and Optical Components: Scratch- and shock-resistant liners for OLED display modules, LiDAR sensors, and HUD mirrors, ensuring zero micro-scratches and zero electrostatic damage throughout the entire transportation process.
Aftermarket Parts and MRO Management: Durable protective liners for high-value repair parts (such as ECUs and sensors), integrated into standard HP boxes or KLT containers to enable thousands of reuse cycles.
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