Buy smoke density chamber or smoke density tester IEC-61034 is all about the assessment of plastic used on a cable. This test is also integrated with the new CPR regulation in Europe for cables in EN 50399 and EN 50750.

In the case of fire, the smoke has many effects, one of the worst being visibility reduction.
It delays escaping from buildings, as the smoke is quickly felt like an impenetrable barrier
affecting breathing and irritating the eyes. Visibility (m) is assessed through smoke
opacity, by calculating its optical density, extinction coefficient or transmittance.
Finally, the effect of opacity on people is determined using models that take into
account the object they want to see through the smoke.
https://www.techtrivial.com/pr....oduct/smoke-density-