Fireseal is a Class 0 fire retardant acoustic foam: an impregnated polyurethane foam with a density above 90 kg/m³, rated EN 13501-1 B-s1,d0 and UL94 94-V-0. Manufactured in the UK to ISO 9001. It is used where a foam has to both absorb sound and resist the spread of flame: air conditioning and duct systems, generator rooms, engine bay compartments, oil rigs, MOD vehicles, prison mattresses, marine and automotive applications, and recording studios. Is Class 0 the right rating for what you are doing? This is the question worth getting right, because Class 0 and Crib 5 are routinely confused and they are not interchangeable. Standard What it tests When you need it Class 0 Surface spread of flame and fire propagation on a building surface, under UK Building Regulations. Assessed via BS 476 Parts 6 and 7. Wall and ceiling linings, ductwork, HVAC, plant and generator rooms, acoustic treatment within a building. Crib 5 Ignition resistance of furniture, under BS 5852 Ignition Source 5 (a small wooden crib). Contract and commercial seating — sofas, chairs, mattresses, upholstered furniture. In short: lining a room, sealing a duct or treating a plant room — Class 0 is what you want, and this is the product. Re-covering a sofa or chair — Class 0 is not the relevant standard, and you want a Crib 5 upholstery foam from our main range instead. Fire performance Test Result EN 13501-1 Euroclass* B-s1,d0 BS 476 Part 6 — Fire Propagation Index 6mm) BS 476 Part 7 — Surface Spread of Flame Class 1 Building Regulations Paragraph A13(b) Class 0 UL94 Classification 94-V-0 ASTM E84-09 — Surface Burning Flame Spread Index 10 · Smoke Developed Index 20 ASTM C411-04 — Hot Surface Performance @100ºC, 96hr Pass *Euroclass certification covers 6mm–50mm adhered, and 50mm unadhered. Acoustic performance Thickness Sound absorption coefficient 12mm αw 0.30 25mm αw 0.45 75mm αw 0.75 Absorption rises with thickness — 75mm absorbs roughly two and a half times as much sound energy as 12mm. Specifications Type Impregnated polyurethane foam, open cell Colour Dark grey Density >90 kg/m³ Thickness range 6mm – 100mm (stocked: 10mm, 25mm, 50mm) Sheet size 200 x 100cm (78.7" x 39.3") Operating temperature -30ºC to 100ºC Air erosion resistance (ASTM C1071-05, 6–50mm) Pass — does not erode or migrate in air movement up to 6000 ft/min Fungus / mildew resistance (ASTM D-2020-92, G21-96) Does not support growth Water vapour sorption (ASTM C1104-06)