10
(Class B) Liquid combustibles smoke generate method
a) Combustible – Consists of a mixture of 25 percent toluene and 75 percent heptane (of sufficient
quantity to generate curves within the limits specified by Figure 39.1 ) which is to be burned in a
metal receptacle.
b) Receptacle – To be formed of 0.025-inch (0.635-mm) stainless steel, 6-1/4 inches (158 mm) in
diameter and 1-1/4 inch (32 mm) deep, rounded bottom formed by 1/2 inch (12.7 mm) radius.
Located 3 feet (0.9 m) above the test room floor and centered with a ring support. The liquid is to be
poured into the receptacle 30 seconds prior to ignition.
c) Point of Ignition – The probe tips of the igniter are to be placed so that they are above the lip of the
pan and not extending into the pan. This results in ignition of the vapors above the liquid.
Ignition site Shelter / Time Curve
