95. Crude and refined naphthalene: Netherland imports and exports, by countries, 1929 and 1932-37 148 96. Refined naphthalene: Canadian imports, by countries, 1928-29 and 1932-37 150 97. Naphthalene: Japanese imports by countries, 1928-29 and 1932-36 150 98. Crude glycerin: United States imports for consumption, by countries, 1929 and 1931-37 151 99. Refined glycerin: United States imports for consumption, by countries, 1929 and 1931-37 152 ILLUSTRATIONS Chart. Derivation of certain synthetic resins 6 Preform press making pellets for use in molding 18 Vacuum cleaner parts of tar-acid resin illustrating the intricate molded shapes possible 19 Radio cabinet and telephone sets of molded tar-acid resin 19 Cast phenolic resins. Standard shapes and small articles fabricated from them 20 Laminating sheet press 22 Gears made of laminated tar-acid resin 22 Cocktail lounge using tar-acid laminated decorative materials 23 Thermostat case of molded urea resin 33 Scales case of molded urea resin 33 Airplane cockpit enclosures of cast acrylate resin 36 Spectacle lenses molded to optical prescription from acrylate resin 37 Molded polystyrene resins 42 ACKNOWLEDGMENT In the preparation of this report, the Commission had the services of Paul K. Lawrence, Prentice N. Dean, and others of the Commission’s staff. 1. INTRODUCTION This survey deals with the several commercially important types of synthetic resins covered by paragraphs 2, 11, and 28 of the Tariff Act of 1930 and with the raw materials necessary for their production. It is made under the general investigatory powers of the Tariff Commission as provided in section 332 of that act. The field of synthetic resins is a comparatively new one, most of its commercial development having occurred within the past 10 years. In 1937 the domestic output was more than 160 million pounds as compared with slightly more than 10 million pounds in 1927.