Ammonium sulfate
硫酸铵
Ammonium sulfate is a 21-0-0 plus 24 percent sulphur nitrogen-sulphur fertiliser and a key blending component in compound fertiliser plants. Two production routes split Chinese supply: caprolactam by-product (around 70 percent of supply) and synthetic from ammonia plus sulfuric acid. The caprolactam by-product carries trace caprolactam impurities that some downstream blenders specify against. Granular grade trades at a premium to crystalline because of bulk-blending compatibility. Chinese supply concentrates in Henan, Shandong, Jiangsu, and Hebei. US imports do not carry Section 301 on the fertiliser-grade material at the time of writing. This cluster aggregates CAS 7783-20-2 across the regulatory matrix, the CAS page, and the ammonium-sulfate hub.
Glossary
Terms you will meet on this lane
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FOB, Free On Board
Incoterm under which the seller delivers the goods on board the vessel at the named port of shipment. Risk and cost transfer to the buyer once the cargo crosses the ship's rail. The buyer arranges and pays for sea freight, marine insurance, and all destination-side costs.
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CIF, Cost, Insurance, and Freight
Incoterm under which the seller is responsible for the cost of the goods, marine insurance, and sea freight to the named destination port. Risk transfers from seller to buyer when the goods are loaded on board at the origin port, but cost responsibility extends to destination port arrival.
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DDP, Delivered Duty Paid
Incoterm under which the seller is responsible for delivering the goods to the buyer's named destination, including all transport, customs clearance, duties, taxes, and unloading at destination. The most seller-heavy Incoterm, often misused in China-export quotes.
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HS Code, Harmonized System Code
A six-digit international product classification code used by customs authorities worldwide to identify goods, assess duties, and apply trade controls. Countries extend the six-digit base with additional digits for tariff and statistical purposes (10-digit HTS in the US, 8-digit CN code in the EU, 10-digit AHECC in Australia).
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VAT Rebate, VAT Export Rebate
The Chinese government refund of value-added tax paid on inputs used to produce goods for export. Set as a percentage of the export FOB value, varying by HS code and adjusted by the State Administration of Taxation. Rebates of 13%, 9%, 6%, or 0% are typical for chemical exports. The rebate is the single largest policy lever the Chinese government uses to influence which chemicals are exported and at what scale.
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COA, Certificate of Analysis
A document issued by the manufacturer (or by an accredited third-party lab) certifying that a specific batch of a chemical or material meets the agreed specification. Lists tested parameters, results, the test methods used, and a batch number that ties back to production.
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SDS, Safety Data Sheet
The 16-section document that communicates the hazards, handling, storage, and emergency response information for a chemical product. Required at destination customs for any classified hazardous chemical and at the buyer's site for worker safety. SDS is the GHS-aligned successor to the older MSDS format.
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Packing List, Packing List
Document issued by the shipper detailing the contents, packaging, weights, and dimensions of every package in the shipment. Used by the carrier for stowage planning, by customs for entry verification, and by the buyer for receiving inspection.
Regulatory matrix
Cross-jurisdiction compliance
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Ammonium sulfate under REACH
European Union listing status, classifications, importer obligations.
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Ammonium sulfate under TSCA
United States of America listing status, classifications, importer obligations.
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Ammonium sulfate under IECSC
People's Republic of China listing status, classifications, importer obligations.
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Ammonium sulfate under AICIS
Australia listing status, classifications, importer obligations.
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Ammonium sulfate under K-REACH
Republic of Korea listing status, classifications, importer obligations.
Cornerstone hub
Buying chain end to end
Sourzi operator note
For compound-fertiliser blenders, the caprolactam-impurity number on the COA is the line that decides the fit. Synthetic-grade is the cleaner cargo but the price gap is real.
Curated by Sean. Primary-source verified per the regulatory drafting rules in Sourzi CLAUDE.md.
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