Properties of Biobased Rigid Polyurethane Foams Reinforced with Fillers: Microspheres and Nanoclay

Table 2

Changes in optical density (OD) at 600 nm for B-side materials containing various filler percentages.

Filler percentage (%)	0	1	3	5	7
Glass microspheres	0	0.439	0.795	1.236	1.668
Nanoclay	0	0.882	1.511	2.047	2.557