in terms of exposure of the styrofoam to the air; I know lots of materials degrade merely by exposure to air.
also, what level of cracking or breaking is acceptable? IOW, are there some cracks which do not diminish the styrofoam's ability to absorb impact so that your noggin doesn't have to?
thanks!
gd
also, what level of cracking or breaking is acceptable? IOW, are there some cracks which do not diminish the styrofoam's ability to absorb impact so that your noggin doesn't have to?
thanks!
gd