3102.21.00.00—Ammonium sulfate
General
Free
Units
t
Column 2
Free
Special
—
3102.21.00.00—Ammonium sulfateGeneral
Free
Units
t
Column 2
Free
Special
—
HTS 3102.21.00.00 is the U.S. Harmonized Tariff Schedule classification for Ammonium sulfate. It's a 10-digit statistical line in Chapter 31: Fertilizers, Section VI: Products of the Chemical or Allied Industries, used by U.S. Customs and Border Protection to determine the duty rate at entry. 2 active AD/CVD orders flag this code.
New to HTS codes? Read our guide on how HTS classification works →
Active orders that may apply to imports under this HTS code. HTS coverage is advisory — actual scope depends on each order's product description. Run the AD/CVD lookup → to check whether your specific shipment is in scope.
Past CBP decisions classifying real products under this HTS code. Useful precedent when classifying a similar product — each ruling shows how CBP interpreted the code for a specific case.
Source: CBP CROSS (view all rulings on rulings.cbp.gov →)
HTS 3102.21.00.00 is the U.S. Harmonized Tariff Schedule classification for Ammonium sulfate. It belongs to Chapter 31 of the HTSUS.
The general (Column 1) duty rate for HTS 3102.21.00.00 is Free. This is the most-favored-nation (MFN) rate that applies to imports from World Trade Organization member countries.
No active Chapter 99 tariff overlays (Section 301, Section 232, IEEPA reciprocal, etc.) currently flag HTS 3102.21.00.00 in Tandom's catalog. Use the calculator's date + origin inputs to confirm against any retroactive overlay you may be filing.
Yes — 2 AD/CVD orders flag this code: A-570-049 (AD, China), C-570-050 (CVD, China). Open the code page for deposit rates, scope determinations, and the linked case lookups.
Tandom guides relevant to this code
Where trade compliance APIs fit in a broker's filing pipeline: HTS classification, duty calculation, AD/CVD scope match, and post-summary corrections.
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Cash deposit cascade, separate rates, all-others, and PRC-wide rates. Worked example on case A-570-910 (galvanized welded steel pipe from China) with three exporter-specific rates.
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Scope text is authoritative; the HTS list is illustrative. Read scope, find past rulings, and file a 19 CFR 351.225 inquiry. Worked example on case A-570-106 (wooden cabinets from China).
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Run thousands of product descriptions through HTS classification, score the confidence, and triage borderline rows. Public search endpoint plus the closed-beta three-layer Classifier.
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How to read, order, and report Chapter 99 HTS codes alongside the base classification on a US entry summary in 2026. The full stacking ladder for brokers and compliance teams.
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Why raw LLM prompts fabricate stat suffixes, why MCP-augmented prompts do not, and the prompt template a broker can hand to Claude or ChatGPT today.
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