U.S. imports of Styrene-Acrylonitrile (SAN) Copolymers in Primary Forms (SITC 57291) totaled $9.0M in August 2026, imported from 15 countries.
Importers of Styrene-Acrylonitrile (SAN) Copolymers in Primary Forms paid $932K in duties in August 2026, an average duty rate of 10.79% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Styrene-Acrylonitrile (SAN) Copolymers in Primary Forms imports of $9.0M in August 2026 ran 33% above the year-to-date monthly average of $6.7M.
Last updated: August 2026 dataSAN copolymers combine styrene's processability with acrylonitrile's chemical resistance and rigidity, producing a transparent engineering resin used in housewares, laboratory ware, and automotive instrument clusters. As a named copolymer heading, SAN is classified separately from both general polystyrene and ABS, and the acrylonitrile content ratio is the key specification that defines the material and supports correct classification. SAN competes with polycarbonate and acrylic in clarity-critical applications where moderate chemical resistance is required.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
172 import shipments a month
The defining difference is the presence of butadiene rubber in ABS, which gives it impact resistance and opacity. SAN lacks the butadiene component, remaining transparent and more rigid. Customs classification relies on the polymer composition confirmed by the manufacturer's technical data sheet; a material misidentified as SAN when it contains butadiene would be reclassified as ABS.
Housewares (mixing bowls, storage containers), medical and laboratory devices requiring chemical resistance, automotive interior trim, and cosmetic packaging are the primary end-use sectors. Demand tends to track consumer goods manufacturing activity and can shift when buyers substitute polycarbonate or acrylic for specific applications.
Basic heading 268 of 465 in section 5
Basic heading 57291 · $9.0M of $27.5B
Imports · August 2026
origin
South Korea and Mexico together supply 77% of it. Japan pays 12.9% duty; Mexico 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
Trade Directory
List your company and tag the 6-digit products you trade, so the companies trading them can find you. Be the first supplier listed.
ImportsExports
Imports
$9.0MYoY · free account
Exports
$4.5MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $76.3M of Styrene-Acrylonitrile (SAN) Copolymers in Primary Forms and exported $50.3M.
Through August 2026. Source: U.S. Census Bureau.