How to verify a clinker supplier
By the Vanguard Verify desk · Published 2026-10-25 · Updated 2026-10-25
Short answer: confirm the exporter in its official company registry, find out whether it owns the kiln or is a trader (and if a trader, get proof of supply from the plant), agree a written chemical and physical specification, appoint an independent inspection company at the load port, and pay against shipping documents through a documentary credit — never a large advance to an unchecked seller.
Clinker is the intermediate product of a cement kiln, ground with gypsum and other constituents to make cement. It moves in bulk, so a single cargo is a large amount of money and worth checking properly.
Steps to verify a clinker supplier
- Registry check. Search the exact legal name and registration number in the official registry of the exporter's country — for example Vietnam's National Business Registration Portal or the UK's Companies House. Check the LEI on GLEIF if one is quoted. See how to check a company is real.
- Producer or trader? Ask which plant the clinker comes from. A producer's plant should appear on its own website or annual report. A trader should be able to show an authority or supply contract from the plant, which you can confirm with the plant using contact details from the plant's own website.
- Agree the specification in writing. Buyers normally set limits for chemistry (for example MgO, free lime, loss on ignition, insoluble residue, SO3), phase content (C3S, C2S, C3A, C4AF) and strength of a laboratory cement made from the clinker. If you sell into Europe, EN 197-1 defines Portland cement clinker as at least two-thirds calcium silicates by mass, with a CaO/SiO2 ratio of not less than 2.0 and MgO not exceeding 5.0% by mass.
- Independent inspection at the load port. Appoint the inspection company yourself, or agree one jointly, to sample and analyse the cargo and determine quantity by draft survey. Check any report directly with the issuing office — see how to verify an SGS report.
- Check the shipping documents. Confirm the vessel, the bill of lading and the loading port. See how to verify a bill of lading.
- Pay against documents. A documentary credit that calls for the bill of lading, the inspection certificate of quality and weight, and a certificate of origin protects both sides better than an advance.
Documents to ask for and how to check them
| Document | Issued by | How to check |
|---|---|---|
| Certificate of incorporation | National registry | Search the registry yourself |
| Plant supply authority | Cement producer | Call the plant via its own website |
| Quality and weight certificate | Inspection company | Verify with the issuing office |
| Bill of lading | Carrier or its agent | Confirm with the carrier; check vessel tracking |
| Certificate of origin | Chamber of commerce or authority | Verify with the issuer |
Red flags
- The seller cannot name the plant or the loading terminal.
- The specification sheet has no MgO or free lime limits, or no test method.
- The seller refuses an inspection company chosen by the buyer.
- A large upfront payment or "documentation fee" is demanded before a contract.
- The seller asks for your proof of funds through a SWIFT message before any contract. The buyer gives proof of funds, the seller gives proof of product — see POF vs POP.
- The company in the documents has a different name or registration number from the registry.
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FAQ
What is the difference between clinker and cement?
Clinker is the nodular product of the cement kiln. Cement is made by grinding clinker with gypsum and, for many cement types, other constituents.
Which standard defines Portland cement clinker?
In Europe, EN 197-1 defines it: at least two-thirds calcium silicates by mass, CaO/SiO2 ratio not less than 2.0, and MgO not more than 5.0% by mass.
Who should appoint the inspection company?
The buyer, or both parties jointly. The inspector samples and analyses the cargo and determines quantity, usually by draft survey.
How should I pay for a clinker cargo?
A documentary credit against the bill of lading, inspection certificate and certificate of origin protects both sides better than an advance payment to an unchecked seller.
Vanguard Verify is run by Vanguard Trade Capital Goods Wholesalers DWC-LLC, Dubai South, Licence 14282. This answer is general information, not legal or financial advice.