Euroclass
Also: Euroclass system, European fire class, EN 13501-1 class
European reaction-to-fire classification system defined by EN 13501-1. Materials are graded from A1 (non-combustible) through F (no performance determined). Class B is the highest practical rating for combustible materials such as plywood.
Euroclass is the European harmonized reaction-to-fire classification used across the EU and EFTA. The main classes are: A1 (no contribution to fire), A2 (very limited contribution), B (very limited contribution but not non-combustible), C (limited contribution), D (acceptable contribution), E (acceptable performance under small flame), F (no performance determined or not tested).
For walls and ceilings the class is supplemented by smoke production (s1, s2, s3) and flaming droplets (d0, d1, d2). Floor coverings use a parallel system with the suffix 'fl' (e.g. Bfl-s1). The full notation B-s1,d0 means: Class B reaction, lowest smoke production, no flaming droplets - the standard target for fire retardant plywood used in regulated environments.