B-s1, d0 is a reaction-to-fire classification: B describes fire contribution, s1 smoke production and d0 flaming droplets or particles.
Euroclass
Reading the classification
BS EN 13501-1 classifies how construction products react to fire. The main letter describes contribution to fire, the s suffix describes smoke production, and the d suffix describes flaming droplets or particles.
The classification is different from 30- or 60-minute fire resistance, which concerns how an element performs over time in a fire-resistance test.
Euroclass
Why the complete build-up matters
A result belongs to the tested product and installation arrangement. Fabric type, timber species, thickness, substrate, adhesive, air gap and whether a material is adhered or unadhered can all affect the classification.
Historic BS 476 Class 1 results were sometimes accepted for Euroclass C during the transition, but they should not now be presented as an automatic equivalence.
Euroclass
Treatment before testing
For wallcoverings and similar fabric systems, Fire Proofing Ltd can currently treat material before laboratory testing. We do not claim a Euroclass for an untested post-treatment combination where supporting data is unavailable.
A BS EN 13501-1 programme can cost roughly £3,000–£5,000 for each relevant fabric and substrate combination, which is why purchasing material already supplied with suitable supporting test data is often the practical route.