Sulphur Supplier & Exporter — Granular and Refinery Grade Sulfur

Q: What is the difference between the granular and refinery grades?

Assay and form. Granular sulphur is the export grade: 99.50% minimum purity on a dry basis, ash 0.05% maximum, screened so 90% falls between 2 and 6 mm. Refinery sulphur runs a higher 99.7% minimum purity but a looser 0.09% ash and 0.8% moisture, and is supplied in the form it leaves the recovery unit.

Q: Is your sulphur free of arsenic and selenium?

Yes — the granular grade is certified commercially free from arsenic, selenium and tellurium. That matters for sulphuric acid plants, because those three poison the vanadium catalyst in the contact process.

Q: Why is purity reported on a dry basis?

Because recovered sulphur always carries some free water from the forming and handling stage, and reporting wet would understate the material. Moisture is specified separately — 0.5% maximum on the granular grade, 0.8% on the refinery grade — so you can see both numbers and calculate the as-shipped assay yourself.

Q: How dangerous is sulphur dust?

Sulphur dust forms an explosive mixture with air, and that is the main handling hazard. The granular grade is screened to keep the sub-2 mm fraction at 10% maximum for exactly this reason. Earth your handling equipment, keep drop heights short, avoid open flames and follow the Safety Data Sheet that ships with every consignment.

Q: Can you supply sulphur for sulphur bentonite fertilizer?

Yes, and we supply the carrier clay as well. Sulphur bentonite pastilles are typically 90% elemental sulphur to 10% bentonite; the clay swells in the soil and fractures the pastille so the sulphur oxidises at a rate a crop can use. See our bentonite carrier grade for the matching analysis.

Q: What is the minimum order quantity for sulphur?

One 20 ft container, approximately 25 MT, for bagged material. Bulk vessel shipments start at 500 MT. Trial quantities can be arranged so you can qualify the material before a full order.

S Elemental Sulphur · Purity 99.5 – 99.7%

Bright-yellow elemental sulphur in two grades: granular at 99.5% minimum purity screened 90% into the 2–6 mm band, and refinery sulphur at 99.7% minimum. Both are commercially free of arsenic, selenium and tellurium, tested to BS 4113 and ISO methods, and shipped with a batch-specific Certificate of Analysis.

Request a Sulphur Quote Packaging & Incoterms

Bulk granular sulphur — bright yellow elemental sulfur for sulphuric acid and fertilizer production — B2B export supplier Raivaco

S ≥ 99.5%

≥ 99.5%

Purity, dry basis

≤ 0.05%

Ash content, granular

≥ 90%

Granules 2 – 6 mm

Per batch

Certificate of Analysis

Physical Properties

Formula

Atomic Weight

32.06 g/mol

CAS No.

7704-34-9

Melting Point

115 °C

Bulk Density

≤ 1240 kg/m³

Colour

Bright yellow

Synonyms: Sulphur, Sulfur, Brimstone, Elemental Sulphur, Granular Sulphur · EINECS 231-722-6 · Brittle, odourless yellow solid; insoluble in water, combustible and capable of forming explosive dust with air.

Grades & Chemical Analysis

Two grades off the same sour-gas and refinery desulphurisation route. Granular is the export form, screened and dust-controlled for bulk handling; refinery grade is the higher-assay material. Select a grade to view its full analysis.

Export Grade — Screened, dust-controlled granules

Granular Sulphur

2 – 6 mm

Purity (dry basis): Min 99.50 wt% · BS 4113
Ash Content: Max 0.05 wt% · BS 4113
Moisture: Max 0.5 wt% · BS 4113
Hydrocarbons: Max 0.05 wt% · BS 4113
Acidity (as H₂SO₄): Max 0.02 wt% · ISO 3704
Bulk Density: Max 1240 kg/m³ · ASTM D-1895
Colour: Bright yellow · visual
Size 2 – 6 mm: Min 90% · ISO 8397
Size > 6.0 mm: Max 10%
Size < 2.0 mm: Max 10%
Arsenic / Selenium / Tellurium: Commercially free

Values are the acceptance limits carried on the batch certificate. Purity is reported on a dry basis, so a cargo with 0.5% moisture still assays against the same 99.50% figure. A batch-specific CoA is issued per shipment.

Granular Sulphur — Size Distribution

Screening governs dust, and dust governs both the fire risk and the handling loss. The granular grade is cut to keep the fine fraction under control.

Granular sulphur size distribution by screen fraction
Screen Fraction	Role	Specification
2 – 6 mm	Main fraction	Min 90%
> 6.0 mm	Oversize	Max 10%
< 2.0 mm	Fines	Max 10%

Screened to ISO 8397. Sulphur dust forms an explosive mixture with air, so keeping the sub-2 mm fraction down is a safety specification as much as a commercial one.

Bespoke Supply

Need a different granulation, or lump sulphur?

If none of the grades above matches your target chemistry, fineness, or packaging, tell us your requirements — we produce custom grades to your exact specification.

Request a Custom Grade

Applications

Around nine tenths of all sulphur produced becomes sulphuric acid, and most of that acid becomes phosphate fertilizer. The rest spreads very widely.

Sulphuric Acid

The dominant outlet — feedstock for the contact process.

Phosphate Fertilizers

Acidulation of rock phosphate into DAP, MAP and TSP.

Sulphur Bentonite Fertilizer

Pastilled 90/10 with bentonite for soil sulphur correction.

Rubber Vulcanization

Crosslinking agent in tyre and technical rubber compounds.

Agrochemicals & Fungicides

Wettable and dusting sulphur for orchards and vines.

Mining & Metal Leaching

Acid generation for copper, nickel and uranium leach circuits.

Pulp & Paper

Sulphite and kraft pulping chemicals.

Sulphur Concrete & Asphalt

Acid-resistant binder for industrial flooring and paving.

Pharmaceuticals & Cosmetics

Dermatological preparations and specialty chemicals.

Packaging, Logistics & Trading Terms

How we screen, bag, certify and ship sulphur. Terms can be adapted by agreement — tell us what your operation needs.

Minimum Order Quantity: 1 × 20 ft container (approx. 25 MT) bagged. 500 MT minimum for bulk vessel. Trial quantities available for qualification.
Packaging: 25 kg and 50 kg PP bags, 1–1.5 MT woven jumbo bags, or bulk vessel. Bulk shipments are loaded to keep the fines fraction and dust generation down.
Incoterms & Loading Ports: EXW, FOB, CFR and CIF (Incoterms® 2020). Standard loading at Bandar Abbas and Bandar Imam Khomeini; other ports by arrangement.
Quality Certification: Batch-specific CoA with every shipment covering purity on a dry basis, ash, moisture, hydrocarbons, acidity and screen analysis to BS 4113 and ISO methods. SGS / Bureau Veritas inspection at buyer’s cost.
Lead Time: 7–14 days for standard grades after order confirmation; 15–25 days for custom-milled or specially packed material.
Storage & Handling: Store in a dry, well-ventilated area away from oxidising agents, strong bases and all ignition sources. Sulphur is combustible and its dust forms an explosive mixture with air, so avoid generating dust during transfer, earth handling equipment and keep drop heights short. Wet sulphur is corrosive to steel. A Safety Data Sheet ships with every consignment.

Certificate of Analysis

A batch-specific CoA is issued with every shipment. Third-party inspection by SGS, Bureau Veritas or an inspector of your choice can be arranged at the buyer’s cost.

Ready to quote

Send us your grade, tonnage, destination port and packaging and we will return a firm FOB/CFR/CIF price with lead time.

Request a Sulphur Quote

Sulphur — Frequently Asked Questions

What is the difference between the granular and refinery grades?