Motives for substitution.

One of the most important reasons why a manufacturer may decide to substitute a synthetic resin for another material is the resulting economy in the sense of economy in total costs. As a rule, the synthetic resin will be more expensive pound for pound than the material for which it is substituted; but frequently the manufacturing cost is enough lower to more than make good the difference in material cost, because the resin part will come from the mold almost in finished form, whereas the part made of wood or metal will require considerable fabrication. In some cases there may be a saving in marketing costs. For example, the shades for large office fixture lights are now made of synthetic resin as well as of opal glass. The resin shades are less expensive to ship because they are lighter and require less expensive packing.

Another incentive toward substitution is to give novelty, and hence sales appeal, to an old product. In many cases the use of synthetic resins fits in with the present tendency to redesign an old-style product so that it will be more compact, have more pleasing lines, and more color.

Still another incentive toward substitution is to give the product greater usefulness, or lower costs in use. The great expansion in the use of synthetic resins in surface coatings has come about because, with these materials, coatings can be developed to fit special purposes, and dry rapidly, which means an important saving to those who use them.