Subheading 390311: Styrene Polymers; Expansible Polystyrene, in Primary Forms
Subheading 390319: Styrene Polymers; (other than Expansible Polystyrene), in Primary … etc.
Subheading 390320: Styrene Polymers; Styrene-acrylonitrile (San) Copolymers, in Prima … etc.
Subheading 390330: Styrene Polymers; Acrylonitrile-butadiene-styrene (Abs) Co … etc.
Subheading 390390: Styrene Polymers; in Primary Forms, N.E.C. in Heading no. 3903