How Foam Rubber Is Made. The differences between foam and sponge rubber begin with ingredients and end with molecular structure. Foam rubbers use a blowing agent, typically a gas or a chemical that produces a gas, to create a mass of small bubbles in a liquid mixture.
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There are three ways in which the elements of an array can be indexed: 1  0 (zero-based indexing): The first element of the array is indexed by subscript of 0. 2  1 (one-based indexing): The first element of the array is indexed by subscript of 1. 3  n (n-based indexing): The base index of an array can be freely chosen.