It Starts with Sulphur
This year’s run-up in phosphorus chemicals does not originate in phosphate rock itself but in sulphur. After the Strait of Hormuz closed at the end of February, Middle East sulphur could not ship out — and sulphur and sulphuric acid are the lifeline that turns phosphate rock into phosphoric acid and then into DAP and MAP. Once the feedstock is cut off, the whole downstream chain tightens.
How the Price Passes Down Step by Step
A few industry data points make it clear: in May wet-process purified phosphoric acid rose nearly RMB 1,000 in a single month, briefly breaking RMB 11,000/t in East China; yellow phosphorus, pulled by sulphur, climbed from RMB 27,300/t to RMB 32,700/t across Yunnan, Guizhou and Sichuan; and in April the average DAP price already stood above USD 700/t. Each step of the increase squeezes cost a little further downstream.
What Buyers Can Do
For customers buying phosphates and calcium products, this round of pass-through has several practical implications:
- Quotes are valid for less time. With costs moving daily, suppliers offer fewer long-validity quotes — watch the pricing window closely when negotiating.
- Price-lock clauses belong in the contract. For larger volumes, agree a fixed price within a defined period, or a trigger for adjustment if freight or raw material costs exceed a threshold.
- Do not look at unit price alone. As phosphoric acid gets dearer, downstream products such as feed-grade and food-grade phosphates follow, so factor that layer into total cost.
The market will not keep climbing forever, but uncertainty on the sulphur side will not disappear soon. What buyers can do is build cost pass-through into their own risk control rather than reacting when the price increase letter arrives.
Why Sulphur Moves the Whole Chain
Because sulphuric acid is essential to the wet process, and sulphur is its main feedstock. The Middle East is a major global sulphur exporter, so when shipments out (for example through the Strait of Hormuz) are disrupted, spot sulphur tightens and prices rise first; acid producers’ costs follow immediately, then wet-process phosphoric acid, then fertiliser and phosphates. No link in this chain can absorb the increase on its own — it can only be pushed downstream.
The Three Stages of Pass-Through
- Stage one, feedstock moves first. Sulphur and sulphuric acid quotes rise, and regional spreads widen in the domestic acid spot market.
- Stage two, intermediates follow. Wet-process purified acid and yellow phosphorus reprice, and producers shorten quote validity and reduce long-validity offers.
- Stage three, end users absorb it. Fertiliser, feed-grade and food-grade phosphates and phosphorus additives rise in turn, and customers receive new prices with shorter validity.
Knowing which stage you are in matters: locking price during stage one is the cheapest moment, while negotiating at stage three usually leaves very little room.
Four Practical Moves for Buyers
- Put quote validity in writing. State that a quote holds for X days and must be reconfirmed after that, so verbal assurances do not become disputes.
- Agree a price-adjustment trigger. Set a threshold on sulphur, acid or freight movement, with an agreed formula beyond it, so both sides share expectations.
- Compare total cost of ownership, not unit price. Once units are on the same basis, add freight, taxes, storage and capital occupation, following the method in our full-process mineral procurement guide.
- Build a dual-source structure. Keep at least two sources for critical inputs so a single origin’s policy or logistics disruption cannot stop your line.
Frequently Asked Questions
Is phosphate rock itself driving this round of increases?
No — the main driver is the sulphur and sulphuric acid side. Phosphate rock prices have been broadly holding at high levels over the same period, and the real movement comes from input costs. Being clear about this prevents you from negotiating an input-cost increase as if it were an ore-price increase.
How long will the pass-through last?
It depends on how quickly sulphur shipments and inventories recover, and whether downstream demand can absorb the increases. When demand is soft, the pass-through is slower and more uneven — some products rise while others cannot, which is exactly why comparison must be item by item.
Can small-volume buyers only accept price increases?
No. Even small volumes can negotiate “lock volume early, deliver in batches”, anchoring price to the current period and trading delivery scheduling for price certainty. The key is showing the supplier a long-term volume rather than negotiating a single order.
Further Reading
- Phosphate Rock Procurement Guide: Grade Pricing, Quality Penalties and Landed Cost Calculation
- Mineral Procurement: A Full-Process Guide from Sourcing to Cost Reduction
Related Reading
- Red Sea Freight Rate Volatility and Its Impact on Mineral Arrivals
- Nanzhao Cleanup: 14 Calcium Powder Firms to Remove Equipment
- Egypt Halts New Phosphate Export Contracts, Jordan Resumes Supply: the Middle East Sourcing Landscape Is Shifting
- Phosphate Fertiliser Exports Halved; MAP -81.19%, DAP -95.33%