From BS 476 to European classifications, understanding fire test standards is essential for specifiers. We explain the key tests and what they demonstrate.. Fire Testing Standards Reaction to Fire (Surface Spread) BS 476 Part 7 — Surface spread of flame (Class 1 4) BS 476 Part 6 — Fire propagation index BS EN 13501 1 — European classification (A1 to F) Fire Resistance (REI) BS 476 Part 20 24 — Fire resistance of elements BS EN 1363 — European fire resistance test methods BS EN 13501 2 — Classification using fire resistance test data Specific Product Tests BS 476 Part 22 — Non loadbearing elements BS EN 1634 1 — Fire resistance of door assemblies BS EN 1366 — Service installations (dampers, penetration seals) European Classification System A1 — No contribution to fire (stone, steel, concrete) A2 — Very limited contribution (mineral wool, fire rated boards) B — Limited contribution C E — Varying contributions to fire F — No performance determined For fire testing guidance, contact us.