A protective case foam liner is the critical barrier that shields precision equipment from impact, vibration, and abrasion. Choosing the right foam material extends equipment life and improves transport efficiency. The two most common materials KeXin encounters are EVA foam and PU foam.
EVA Foam Characteristics and Applications
EVA (ethylene-vinyl acetate) foam is the mainstream material for protective case inserts. It is lightweight, resilient, chemically resistant, and electrically insulating. EVA can be CNC-cut or compression-molded to match device contours exactly, preventing movement inside the case.
EVA densities range from 30 kg/m³ to over 100 kg/m³. Low-density EVA suits lightweight, non-precision equipment, while high-density EVA is ideal for valuable instruments, optical devices, and medical equipment. KeXin Series 1, 6, and 8 cases can all be fitted with custom EVA inserts of varying densities.
PU Foam Advantages and Limitations
PU (polyurethane) foam is softer and offers excellent shock absorption. It is often used for devices that are handled frequently or have surfaces prone to scratching. PU foam has better abrasion and tear resistance than standard EVA, but it is more expensive and slightly heavier.
PU foam is best suited for electronics or optical instruments with delicate surfaces. For long-term outdoor use or exposure to oils and chemicals, treated PU or high-density EVA is recommended.
How to Choose the Right Liner
KeXin provides full-service foam liner customization, from design and prototyping to mass production. Customers only need to provide device dimensions and protection requirements; our engineers deliver a liner proposal within 5-7 working days.
Conclusion
EVA foam offers the best cost-performance ratio and is suitable for most protective cases. PU foam excels in softness and scratch protection. The right choice depends on your equipment characteristics and usage environment. Contact KeXin for professional advice.