Smoke obscuration
Smoke obscuration
Reduction, usually expressed as a percentage, in the intensity of light due to its passage through smoke.
ISO 5660-1:2015/Amd.1:2019(en)
ISO 5660-1:2015(en) Reaction-to-fire tests — Heat release, smoke production and mass loss rate — Part 1: Heat release rate (cone calorimeter method) and smoke production rate