| Cellox did a 60 day study in which one set of forms were exposed to sunlight and another set were not. It wasn't till 30 days before you could see a difference in coloring between the exposed sample and the control. After 60 days, a slight yellow layer, no thicker than a 1/10th thickness of a piece of paper, had formed. Upon dusting the yellow layer of the block off, the fresh EPS was easily exposed with no damage to the foam block. |