EN 407:2004 Level 4 - Burning Behaviour Level 3 - Contact Heat Level 3 - Convective heat Level X - Radiant heat Level 4 - Small splashes of Molten Metal Level X - Large splashes of Molten Metal
EN 407:2004 Level 4 - Burning Behaviour Level 3 - Contact Heat Level 3 - Convective heat Level X - Radiant heat Level 4 - Small splashes of Molten Metal Level X - Large splashes of Molten Metal