Given the rubber top and the lower foam have 2 different material properties, including expansion/contraction, how does the adhesion stand up to time? Won't they separate?

We use a high-density closed-cell EVA foam to construct our Impact Rubber Tiles. This foam is highly moisture resistant, which prevents expansion and contraction. This type of foam allows the rubber top to adhere securely to the foam without falling apart. We have customers who have used these tiles for years without having the layers separate.