ASTM E 84

A test method for determining the surface burning characteristics of building materials, sometimes referred to as the “Steiner tunnel test”. This test method is for single products and evaluates both flame spread and smoke development, assigning different classes based upon test results:

Class	Flame Spread	Smoke Development
A	0-25	0-450
B	26-75	0-450
C	76-200	0-450

Glossary of Acoustic Terms