Materials · Knowledge Centre
By Rohan Shah, SOISU Furniture · 30 May 2026
Direct Answer
When buying premium sofas in India, ask your supplier for a foam certificate to verify quality. The key specifications to verify: foam density (kg per cubic metre) — target 35-50 kg/m3 for seat cushions; ILD (indentation load deflection) — measures firmness, target 25-35 for medium-firm sofa seating; compression set (%) — measures how much foam deforms permanently under load after 22 hours, target under 15%. The certificate should reference ISO 1855 or Indian standard IS 7888. Any supplier who cannot provide this document is selling foam they cannot certify. In India, the foam density claim is frequently inflated in marketing materials — the certificate is the only way to verify the actual specification received.
Request ISO 1855 or IS 7888 certificate showing density (kg per cubic metre), ILD (firmness), and compression set. Understanding this specification is critical for Indian buyers evaluating furniture, as Indian conditions including climate, lifestyle patterns, and household usage differ significantly from the standards for which most furniture is originally designed and tested.
Target density 35-50 kg per cubic metre, ILD 25-35, compression set under 15% for quality Indian sofa foam. When buying furniture in India, use this knowledge to ask informed questions of suppliers, verify claims with documentation, and make purchasing decisions that account for the full 10-20 year ownership lifecycle rather than the immediate purchase decision alone.
SOISU furniture is designed for Indian conditions — Italian design discipline, built for how India lives. WhatsApp us during showroom hours and we reply within the hour.