Why Density Matters
EVA foam density (kg/m³) directly determines the material's hardness, impact absorption capacity and weight. Choosing the wrong density results in a product that is either too soft (compresses under load) or too rigid (uncomfortable and fragile).
Density Ranges and Applications
| Density (kg/m³) | Shore C (approx.) | Primary Applications |
|---|---|---|
| 20–40 | 15–25 | Light packaging, swimming boards, soft padding |
| 40–80 | 25–40 | Car mats, tatami flooring, furniture padding |
| 80–120 | 40–55 | Footwear midsoles, sports equipment, gym mats |
| 120–200 | 55–65 | Boxing padding, high-impact sports, orthopedics |
Not sure which density is right? Our technical team will recommend the correct specification.
Get Technical Advice →Density by Industry
Automotive (Car Mats & Boot Liners)
40–80 kg/m³ is standard for car floor mat backing. The foam must hold shape under foot traffic without being rigid. Boot liners typically use 50–70 kg/m³ for a balance of rigidity and weight.
Footwear (Midsoles & Insoles)
Midsoles require 80–150 kg/m³ for firm impact absorption. Insoles use 40–80 kg/m³ for softness and comfort. Hotel slipper bases (fiyapa) typically use 60–100 kg/m³.
Sports & Fitness (Tatami, Gym Mats)
Tatami mats for martial arts: 60–100 kg/m³. Gym flooring: 50–80 kg/m³. Boxing padding: 80–150 kg/m³. The higher the impact force, the higher the required density.
Packaging (CNC Inserts)
20–60 kg/m³ for lightweight void fill. 60–120 kg/m³ for precision CNC inserts that need to hold a specific shape and grip the product securely.
Shore C Hardness Relationship
Shore C hardness increases proportionally with density but can also be adjusted through the EVA formulation (vinyl acetate content). At Atami EVA we produce Shore C 20–65 across our density range, allowing precise specification for each application.
How to Request the Right Specification
When requesting a quote, provide: application (what will the foam be used for), thickness required, any existing sample or competitor reference, and your target performance (soft/medium/firm). Our technical team will recommend the density and formulation.
Request a sample in your target density — free with confirmed inquiry.
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