The smoke density for a sample having dimension of 120 mm x 100 mm * 4 mm in size was measured by using a smoke density chamber as per ASTM D 2843-0414. The smoke generated (flaming mode) in the process of burning of sample was mea­sured by the change of the light intensity. This test was useful for measuring and observing the relative amounts of smoke obscuration produced by burning or de­composition of the material. Smoke density rating which represents the total amount of smoke present in the chamber for 4 min was measured by Eq. (7).

A

Smoke density rating = j x 100 (7)

where, A and T are the area under the light absorption versus time curve and total area of the curve, respectively.

Table 6.7 shows that the smoke density rating of the natural rubber latex based jute composite is less than that of the traditionally used noise control material, fiber glass.