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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Biographical Master Indexes. Master Indexes provide a name index to books, periodical articles, and other references where you might find a biography or obituary of someone. Usually, you can search by name (last, first) and then be given a code for a title, volume, and page number.