Ammonium Sulfate 21-0-0-24S — China Supplier & Exporter
Ammonium sulfate (NH4)2SO4, 21-0-0-24S — a dual-nutrient nitrogen and sulfur fertilizer supplied from China in crystalline and granular form for agricultural, compound fertilizer and industrial applications.
Supplied from China · Crystalline and granular · Container and bulk shipment
Product overview
Ammonium sulfate is an inorganic salt that delivers two plant nutrients in a single product: nitrogen in the ammonium form and sulfur in the sulfate form. It is normally described by its analysis as 21-0-0-24S. The nitrogen content depends on the production route: crystalline material from caprolactam production is 21% minimum, while granular material — compacted from a mix of caprolactam and other by-product ammonium sulfate — is supplied to a 20.5% minimum. It is an established nitrogen and sulfur fertilizer traded internationally, and China is a major production and export base for it. We supply ammonium sulfate from China to importers, distributors, compound fertilizer producers and industrial buyers worldwide.
Where it is used
- Straight nitrogen and sulfur fertilizer for agriculture
- Raw material for NPK and compound fertilizer production
- Granulation and blending into bulk blends
- Industrial uses where a sulfate nitrogen source is required
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 |
|---|---|
| Molecular formula | (NH4)2SO4 |
| CAS number | 7783-20-2 |
| EINECS / EC number | 231-984-1 |
| Grade analysis (nominal) | 21-0-0-24S |
| Appearance | White to off-white crystals or granules |
| Solubility | Highly soluble in water |
| 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.
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) | 20.5% minimum (granular) / 21% minimum (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 |
| Particle size | Confirmed per lot — see TDS / COA Relevant for granular form |
| Appearance / colour | White to off-white — confirmed per lot |
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 ammonium sulfate
Two nutrients in one product
Ammonium sulfate supplies nitrogen and sulfur together. For crops and soils that are short of sulfur, it removes the need for a separate sulfur application.
Ammonium nitrogen
The nitrogen is in the ammonium form, which carries a lower ammonia volatilisation risk than surface-applied urea under many soil conditions, is held on the soil exchange complex, and is readily taken up by crops. Ammonium sulfate can still volatilise, particularly when surface-applied to alkaline or calcareous soils; incorporation, rainfall or irrigation helps move it into the soil and reduces exposure to surface conditions.
Established blending raw material
It is a standard component in NPK formulations and bulk blends, valued as a low-cost nitrogen source that also contributes sulfur to the analysis.
Suitable for many soil types
Its acidifying effect in the soil is used deliberately where alkaline soils or bicarbonate-rich irrigation water reduce the availability of micronutrients.
Applications
- Straight nitrogen and sulfur fertilizer for agriculture
- Raw material for NPK and compound fertilizer production
- Granulation and blending into bulk blends
- Industrial uses where a sulfate nitrogen source is required
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.
Ammonium Sulfate — common questions
What is ammonium sulfate?
Ammonium sulfate is an inorganic salt with the chemical formula (NH4)2SO4. The fertilizer grade contains nitrogen and sulfur and is traded under the grade description 21-0-0-24S. The nitrogen content depends on the production route — see the question on nitrogen content below.
What is 21-0-0-24S?
It is the standard analysis used for ammonium sulfate: nitrogen, no phosphorus, no potassium, and sulfur. The figures are nominal values; the exact analysis for your cargo is declared on the certificate of analysis for that production lot.
Why does the nitrogen content differ between products?
Ammonium sulfate nitrogen depends on the production route. Crystalline material from caprolactam production is 21% minimum. Other by-product sources, including coke-oven material, run lower — around 19–20.5%. Granular ammonium sulfate is compacted from a mix of these sources and is therefore supplied to a guaranteed 20.5% minimum. Granular material consistently above 21% indicates a product made solely from caprolactam crystal.
Do you supply both crystalline and granular ammonium sulfate?
Yes — we supply both crystalline and granular ammonium sulfate. Tell us the form, quantity and destination, and we will confirm the particle size and analysis available for your shipment against the TDS and COA for the production lot.
Which documents are provided with a shipment?
A certificate of analysis, technical data sheet and standard export documents are issued on a per-shipment basis. Certification beyond that is confirmed for each order before contract. See our Quality & Documents page.
Guides for 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 ammonium sulfate from China?
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