This test method covers the determination of density of foam by calculation from the mass and volume of a
regularly shaped specimen. The test method ASTM D – 3575 (section 43, Method A) [22] was used. At least 10 specimens
were measured for each formulation.
The dimensions of the sample were measured using a Vernier Calipers graduated to permit measurements accurate
to 0.001 inches. Expansion ratio was calculated as the ratio of the cross-sectional area of the foam to that of the die.