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I have been searching for sources of EPP sheet because I want to do some testing. One test involves sliding a body panel attached to a car bumper. The idea is to simulate one aspect of a "crash". A weight will force the panel to bounce and then slide on the road.
One reason to do this is to compare layer options. One layer option is 2 inches of EPP on both sides of 6 mm coroplast. This configuration "protects" the coroplast. Another layer option is an outer layer of coroplast covering a single layer of EPP. Some layer options are more easy to repair than others.
Like the designer of the Spira, I wish to not only protect the driver, I wish to protect pedestrians, and to reduce repair costs.
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