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SITCSection 5
U.S. imports of acid and mordant dyes and preparations (SITC 53112) totaled $4.0M in April 2026, traded with 22 countries.
Importers of Acid and Mordant Dyes and Preparations paid $611K in duties in April 2026 — an effective duty rate of 17% on $3.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataAcid dyes bond ionically to protein and polyamide fibers — wool, silk, and nylon — making them a critical input for the specialty textile, carpet, and leather dyeing industries. Mordant dyes in this grouping require a metallic salt fixative to achieve wash-fastness, a processing distinction that affects both formulation and wastewater compliance at the mill level. Classification between acid and mordant subtypes matters for end-use documentation, particularly when preparations contain pre-complexed metal ions that could trigger separate chemical regulatory review.
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Acid dyes are applied directly from an acidic bath and bond to fiber without a separate fixative, while mordant dyes require a metallic mordant — typically chromium or aluminum salts — applied before or after dyeing to fix the color. This processing distinction can affect classification when a preparation contains both the dye and the mordant pre-combined, as the mixture's essential character must be assessed.
Pre-metallized acid dyes containing chromium or other heavy metals may be subject to EPA Toxic Substances Control Act (TSCA) inventory requirements. Importers should confirm that the specific chemical substance is listed on the TSCA inventory or that an applicable exemption applies before entry.
Monthly import values over time
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