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Foam Density Guide for B2B Furniture Buyers
For B2B furniture buyers, foam density is the single most important specification you will evaluate. It determines comfort, durability, cost, and — crucially for compressed sofas — how well the product recovers after vacuum packing. This guide covers everything a procurement professional needs to know.
What Is Foam Density?
Foam density is measured in kilograms per cubic meter (kg/m³). It indicates how much foam material is packed into a given volume. Higher density means more material, greater durability, and better compression recovery — but also higher cost.
- Low density (15–25 kg/m³): Soft, affordable, but sags quickly. Not suitable for commercial or compressed applications.
- Medium density (25–35 kg/m³): Standard residential grade. Acceptable for occasional-use compressed sofas.
- High density (35–50 kg/m³): Commercial grade. Ideal for hotel, rental, and high-turnover applications. Excellent compression recovery.
- Ultra-high (50+ kg/m³): Used in specialty applications (e.g., medical seating). Overkill for most sofa applications and makes compression recovery slower.
ILD (Indentation Load Deflection) — The Other Key Metric
ILD measures how firm a foam feels. It is separate from density. A 40 kg/m³ foam can be soft (low ILD) or firm (high ILD) depending on formulation.
- Low ILD (<25): Plush, sink-in feel. Good for decorative cushions.
- Medium ILD (25–40): Balanced comfort and support. Standard for seating.
- High ILD (40–60): Firm support. Ideal for lumbar support and commercial seating.
For compressed sofas, we recommend: 35–45 kg/m³ density with 30–40 ILD. This combination delivers the best balance of compression recovery, comfort, and longevity.
High-Resilience (HR) Foam vs Standard PU Foam
| Property | HR Foam | Standard PU Foam |
|---|---|---|
| Density range | 30–55 kg/m³ | 15–30 kg/m³ |
| Compression recovery | Excellent (>95% after 48h) | Moderate (70–85%) |
| Lifespan (daily use) | 5–8 years | 2–4 years |
| Cost per m³ | $80–$150 | $30–$60 |
| Recommended for compressed? | Yes | Not recommended |
Why Density Matters for Compressed Sofas
When a sofa is vacuum compressed, the foam is held at a fraction of its normal volume — sometimes for weeks or months during shipping. Upon opening, the foam must expand to its original shape. Low-density foam may:
- Never fully recover its original shape
- Develop permanent creases or flat spots
- Lose support capacity by 30–50% after the first compression cycle
High-resilience foam with 35+ kg/m³ density is engineered to survive the compression process. YiChuHome uses proprietary HD foam formulations tested for multiple compression cycles without degradation.
OEM Specification Tips
When ordering OEM compressed sofas, specify both density AND ILD in your technical requirements sheet:
- “Core foam: 40 kg/m³ HR, 35 ILD”
- “Back foam: 30 kg/m³ HR, 20 ILD”
- “Seat cushion: 45 kg/m³ HR, 40 ILD”
Different zones of the same sofa can (and should) use different foam grades. A premium compressed sofa uses denser foam in the seat and softer foam in the backrest.
Contact YiChuHome for foam sample cards — we will send physical foam samples in your target density range for hands-on evaluation before you commit to bulk production.
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