Sulphur is a key raw material for sulphuric acid, fertilizers and many chemical processes. On paper, most offers look alike; in practice, the details of the specification decide whether a cargo suits your plant.
Common forms
- Granular: the most traded form. Dust-free, free-flowing and easy to handle in bulk or bags.
- Lump: cheaper to produce but dustier and harder to handle and melt evenly.
- Powder and flakes: used in smaller quantities for agriculture, rubber and chemical applications.
What to check in the specification
- Purity: the sulphur content on a dry basis. Confirm the minimum the supplier guarantees, not a typical value.
- Moisture: water adds weight you pay for and can affect storage and melting.
- Ash: non-combustible residue that can foul equipment in acid plants.
- Acidity: residual acid can cause corrosion in storage and processing.
- Organic matter (carbon): can discolour product and disturb some processes.
- Size and dust: for granular sulphur, ask for the size range and dust level.
How to protect yourself
Ask for the producer's specification sheet and a certificate of analysis for the actual lot, not a generic one. For larger shipments, have an independent inspector check quality and quantity at loading. And if the source is new to you, start with a trial order.
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