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For outdoor signs and displays, where the problem of weathering resistance is no longer a factor, the choice of plastics is almost unlimited.

Here may be found regular and impact styrene, cellulose acetate, cellulose butyrate and cellulose propionate, acrylic, vinyl, expandable styrene foam, and polyethylene.

The final choice of material depends upon such factors as costs, method of fabrication, degree of complexity, number of units required, time available for tooling, and projected life expectancy of the unit.

Often, the finished sign or display incorporates several types of plastics and two or more fabricating techniques.