PUBLIC LAW 96-39—JULY 26, 1979 (c) Copoljiners and terpolymers not specially provided for shall be classified as if they consisted entirely of that monomer which is present in the largest amount by weight on a resin content basis (i.e., excluding the weight of plasticizers, liquid diluents, fillers, or other additives). Any polymer consisting of two or more monomers which are present in equal amounts shall be classified as if it consisted entirely of that monomer whose poljiner is listed first under the thermoplastic or thermosetting resins, as appropriate. 5. The term "paints and enamel paints" in this subpart covers dispersions of pigments ur pigmeiit-like materials with a liquid (vehicle) which are suitable for application to surfaces as a thin layer, and which dry (harden) to an opaque, solid film. The vehicle of paints consists of drying oils or resins which bind the pigment particles together in the film; the vehicle of enamel paints is principally varnish. Paints and enamel paints may also contain thinners, driers, plasticizers, or other agents. 6. The terra "varnishes" in this subpart covers liquid surface-coating products which contain no pigments or pigment-like materials, and which dry (harden) to a transparent or translucent film. Shellac varnishes are solutions of shellac or any other form of lac in a volatile solvent such as ethyl alcohol. Oleoresinous varnishes consist of resins dissolved in or reacted with a drying oil, to which thinners, driers, and plasticizers may be added. Cellulose-derivative varnishes Gacquers) are solutions of cellulose nitrate or other cellulose derivatives in a volatile solvent. 7. The terra "stains" in this subpart covers liquids containing transparent or semi-transparent pigments, dyes, or chemicals, chiefly used to deepen or otherwise alter the color of wood, but which will not obscure its grain, texture, or markings. 8. For the purposes of this subpart— (a) The term "surface-active agents" means synthetic organic compounds, or mixtures thereof, which function as surface tension modifiers and are chiefly used for any one or combination of the following purposes: as detergents, wetting agents, emulsifiers, dispersants, or foaming agents. (b) The terra "svTithetic detergents" embraces formulated materials which are used chieily tor household, laundry, and industrial cleaning purposes, and which consist of one or more surface-active agents as the active ingredients in combination with colors, brighteners, perfumes, inert diluents, builders, and extenders such as inorganic salts, pol^-phosphates, polysilicates or sodium carboxymethylcellulose. 9. The terra "plasticizers" in item 409.34 means substances which may be incorporated into a material (usually a plastic, resin material, or an elastomer) to increase its softness, flexibility, workability, or distensibility. 10. The term "drugs" in this subpart means those substances having therapeutic or medicinal properties and chiefly used as medicines or as ingredients in medicines, 11. For the purposes of the provisions of this subpart relating to "colors, dyes, stains, and related products" (except products provided for in items 410.36 to 410.44, inclusive)— (a) the specific duties shall be based on standards of strength which shall be established by the Secretary of the Treasury, and upon all importations of such articles which exceed such standards of strength the specific duty shall be computed on the weight which the article would have if it were diluted to the standard strength, but in no case shall any such articles of whatever strength be subject to a less specific duty than that provided in the respective items of
93 STAT. 221
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