Crystalline Ammonium Sulfate Supplied from China
Crystalline (standard) ammonium sulfate from China — fine white crystals of (NH4)2SO4 for agricultural use, compound fertilizer production and industrial processing.
Supplied from China · Crystalline and granular · Container and bulk shipment
Product overview
Crystalline ammonium sulfate — also called standard or fine grade — is a widely used product form produced through several industrial ammonium sulfate production routes, including caprolactam and other chemical by-product streams. It dissolves readily, is easy to handle in solution and is used both as a straight fertilizer and as an input to compound fertilizer manufacture and industrial processes. Because it is the base grade, it is usually widely available, and price and availability are influenced by the by-product supply from chemical production.
Where it is used
- Straight nitrogen and sulfur fertilizer
- Compound fertilizer and NPK production
- Solution preparation and fertigation where the material meets the required solubility and insoluble-matter specification
- Industrial processes requiring a sulfate nitrogen source
Availability
We supply both granular and crystalline ammonium sulfate. Ammonium sulfate supply in China is driven largely by production from other industrial processes rather than dedicated synthesis, so the particle size and analysis available for a given shipment follow the production schedule. Tell us your requirement and we will confirm the specification we can offer against the TDS and COA for the lot, rather than quoting a nominal figure the cargo may not match.
Product identity
| Chemical name | Ammonium sulfate, crystalline |
|---|---|
| Molecular formula | (NH4)2SO4 |
| CAS number | 7783-20-2 |
| Grade analysis (nominal) | 21-0-0-24S |
| Appearance | White to off-white crystals |
| Also described as | Standard grade, fine grade, crystal grade |
| HS heading (fertilizer grade) | 3102.21 |
Lot-specific data: Typical specification is issued per production lot and confirmed against the TDS and COA supplied with the quotation.
Crystalline Ammonium Sulfate — typical specification
Nutrient figures are nominal values determined by the chemistry of the compound. Every other parameter varies by producer and by production lot and is declared on the documents issued for the lot shipped.
| Parameter | Value |
|---|---|
| Nitrogen (N) | 21% minimum (caprolactam-origin crystal) Crystalline nitrogen depends on the production route — declared per lot on the COA |
| Sulfur (S) | 24% nominal (24S) Declared per lot on the COA |
| Moisture | Confirmed per lot — see TDS / COA |
| Free acid | Confirmed per lot — see TDS / COA |
| Bulk density | Confirmed per lot — see TDS / COA |
| Crystal size | Confirmed per lot — see TDS / COA Producer- and lot-specific |
| Water insolubles | Confirmed per lot — see TDS / COA |
Values marked “confirmed per lot” are lot-specific. The figures applying to your cargo are declared on the Certificate of Analysis and Technical Data Sheet issued for that production lot. Send us your requirements and we will confirm the specification before you commit.
Need the specification before you order? Tell us which parameters are critical for your process — particle size for a blend, moisture for storage, free acid for a reaction — and we will confirm what the available production can meet, in writing, before you commit.
Why buyers specify crystalline ammonium sulfate
Highly water-soluble
Crystalline ammonium sulfate is highly water-soluble and can be used for solution preparation and fertigation when the product meets the required solubility and insoluble-matter specifications. For fertigation applications, buyers should confirm the applicable product specification and COA before use.
Widely produced grade
Produced across a large share of China's ammonium sulfate capacity, crystalline material is the form most enquiries begin with. Availability, specification and production source are confirmed for each inquiry.
Cost-efficient nitrogen and sulfur
It is one of the lower-cost ways to deliver both nitrogen and sulfur into a formulation.
Established industrial input
Beyond agriculture, crystalline ammonium sulfate is used as a processing input in a range of industrial applications.
Applications
- Straight nitrogen and sulfur fertilizer
- Compound fertilizer and NPK production
- Solution preparation and fertigation where the material meets the required solubility and insoluble-matter specification
- Industrial processes requiring a sulfate nitrogen source
Tell us what you need
A few fields is enough to start. We come back with the specification that is available for your destination and a price against it.
Packaging options
- 25 kg bags. Standard small bags for distributors and retail-facing supply. Bag material, printing and palletisation are agreed per order.
- 50 kg bags. Larger bags for agricultural distribution and handling systems that work at 50 kg unit weights.
- Jumbo bags (FIBC). Typically used for industrial buyers and for container or bulk programmes where large unit weights reduce handling cost.
- Bulk (in vessel). Loose cargo for bulk vessel shipment, subject to vessel availability, loading port facilities and discharge requirements at destination.
Container & bulk shipment
Bagged material ships in containers from Qingdao or Tianjin. Large programmes can be arranged as bulk vessel cargo where the destination can discharge loose material. We quote FOB, CFR or CIF — tell us the trade term you want to work on and your destination port.
Loading quantity: Loading quantity depends on packaging, container type and shipping requirements.
Quality documents issued with the shipment
Documents are issued on a per-shipment basis. The certificate of analysis is the manufacturer's own document for the production lot actually shipped — not a document prepared by the trading company.
Certificate of Analysis (COA)
The analysis of the production lot shipped, issued by the manufacturer. This is the document that tells you what you received — check it against the contract specification.
Technical Data Sheet (TDS)
Product description, physical and chemical properties, handling and storage information for the grade.
Export documents
Commercial invoice, packing list, certificate of origin and bill of lading, prepared to match your payment instrument and destination requirements.
Certification beyond this set is reviewed and confirmed for each order before contract — see Quality & Documents.
Crystalline Ammonium Sulfate — common questions
Is crystalline ammonium sulfate the same as standard ammonium sulfate?
Yes. Standard, crystal and fine grade all describe the same physical form — ammonium sulfate as it comes out of production, before any granulation step.
What nitrogen content does crystalline ammonium sulfate have?
Crystalline ammonium sulfate from caprolactam production is 21% minimum. Crystal from other by-product routes, such as coke-oven production, runs lower — around 19–20.5%. Tell us the nitrogen level your requirement calls for and we will confirm the production route and analysis available.
Can crystalline ammonium sulfate be used in fertigation?
Crystalline ammonium sulfate is highly water-soluble and can be used for solution preparation and fertigation when the product meets the required solubility and insoluble-matter specifications. Agricultural-grade crystalline is not automatically a fertigation grade: fertigation buyers may additionally require specific limits on water solubility, water insolubles, solution clarity, trace impurities, heavy metals and filtration performance. Confirm the applicable product specification and COA before use.
Which is more common in export trade — crystalline or granular?
Both are supplied. Agricultural distributors and blenders most often specify granular; compound fertilizer producers and industrial buyers frequently take the crystalline grade. The particle size and analysis available for a given shipment follow the production schedule, so tell us your requirement and we will confirm it against the lot TDS and COA.
Guides for crystalline ammonium sulfate buyers
Ammonium Sulfate, 23 October 2026: China FOB $215-220 on Offers, Not on Deals
Fob China moved up to $215-220/t and the domestic price stopped falling. The unusual part is that almost nothing traded at the new level, which tells you what kind of market this is.
Read more →Ammonium sulfate week 43, 2026: the allocation arrived, the tonnage did not
A week of allocation news and no tonnage. The second round landed at 1.3-1.7mn t, the split is unpublished, Brazil is covered into December and a 42pc nutrient premium caps how far this can run.
Read more →China shipped 2.85 million tonnes of ammonium sulfate in September 2026. The volume is the story
Nine months of Chinese ammonium sulfate exports grew 6.9%. September alone grew 26.4%. Everything that happened this year happened in the last four weeks of the period.
Read more →Ammonium Sulfate Market Report — Week 39, 2026
Chinese domestic ammonium sulfate pushed higher again this week — caprolactam-grade ex-works reached ¥1,230-1,270/t in Shandong and Hualu Hengsheng lifted quotations on 24 September. Export fob held near $205-215/t with Brazil steady, and the end-September allocation round is now the market's biggest variable.
Read more →Looking for crystalline ammonium sulfate from China?
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