EPP and EPS (Styrofoam) are similar in appearance, and PU is similar to sponge.
When comparing EPP and EPS, the overall physical properties and mechanical performance are considered to be superior to EPP, EPS has a unit price advantage. In particular, EPP is widely used in the automobile industry because of its dimensional stability and thin-thickness molding.
Since the mechanical properties differ by more than 10 times depending on the foaming rate, You must check the physical properties with the manufacturer for each foaming rate, and there are slight differences between manufacturers.
For EPS, the recovery rate after compression is relatively low compared to EPP.
| Material | EPS | EPP | PU |
| Full name | Expanded Polystyrene | Expanded Polypropylene | Polyurethane |
| Mechanical strength | Weak | Strong | Strong |
| Elongation | 38~40% | ||
| heat resistance temperature |
80℃ | 100℃ | 120℃ |
| foaming method | Pentane, butane gas used | Pysical foaming | |
| Price | Low($0.35 / liter) | Middle($0.4 / liter) | High |
| flexibility | slightly hard | hard | Soft |
| Flammability | - | - | HB |
| Where to use | packaging material | car bumper, helmet | Automotive, industrial |
Recently, a Japanese company(Mitsubishi) has developed foamed mPPE, It has excellent mechanical performance and dimensional stability compared to EPP with flame retardant V0 grade.
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