China produces most of the world’s drilling-grade PAC, xanthan gum, and drilling starch, and the good factories are genuinely good. The problem is that a buyer searching from outside China cannot easily tell a factory from a reseller, a real laboratory from a template, or a registered exporter from a name on an invoice. Generic “how to vet a Chinese supplier” advice exists everywhere; this checklist is the drilling-chemicals version — what to check, in what order, and what a pass looks like for this specific product class.
| Check | How | Pass condition |
|---|---|---|
| Business license (营业执照) | Ask for it — every legitimate Chinese company provides it without friction; it carries an 18-digit unified social credit code | Name on license = name on quotation = name on bank account, character for character |
| Registry cross-check | China's public enterprise-credit registry lists registration status and scope; sourcing agents and inspection firms can pull a report if you cannot | Status active; business scope includes chemicals |
| Export record | Ask for a recent bill of lading for the same product class (commercial details masked) | Real, recent export shipments — not screenshots of a website |
| Factory or trader? | Ask directly; request a live video walk of the production line | A straight answer. Traders can serve you well — a trader posing as a factory cannot |
The one non-negotiable is the name match. Most supplier fraud in this trade is not fake product — it is a real conversation with a real company’s name ending in a wire to a different account. Match the beneficiary name to the license before any money moves, on the first payment and on every payment after.
Drilling chemicals have an unusual advantage for verification: an open, testable standard. Ask every candidate supplier for a specification stated against API Spec 13A test methods with the edition named. Then apply three filters. First, vagueness: “API quality” or “meets international standards” without a table of numbers is marketing, not a specification. Second, COA plausibility: ask for certificates of analysis from two recent production batches — real laboratory numbers vary batch to batch within the specification; identical round numbers on every certificate suggest a template. Third, the price filter in reverse: in a commodity class with known input costs, the cheapest quote in front of you is a red flag, not a prize — the common quality shortcut in this class is diluted or off-spec material that still looks right in the bag.
For a first order of meaningful size, pay for independent pre-shipment inspection by an international inspection company: sampling against the specification, witness of loading, container sealing. It typically costs a few hundred dollars against a shipment worth far more, and it converts the supplier’s claims into a third party’s report. The refusal pattern is diagnostic — a supplier who will not accept third-party inspection has told you what the inspection would have found. Marketplace escrow schemes (order protection on the big B2B platforms) protect the transaction mechanics but do not test the powder; they complement inspection, they do not replace it.
The red-flag canon, consistent across every sourcing guide and confirmed by practice: never a personal account, never Western Union or cryptocurrency, never 100% upfront to a new supplier. The working norm is 30% deposit, 70% against shipping documents — the balance moves only when the bill of lading, packing list, and batch COA prove what is on the water. The full mechanics — what each document proves and where the risk sits at each stage — are in how 30/70 staged payment works.
Scale is the reward for evidence, not the starting point. Order a pallet to a container, test on arrival against the COA — filtrate, viscosity, moisture are all field-testable with standard API equipment — and file the results with the document set. Three consistent shipments make a supplier; one does not.
Ironstone is a Canadian-registered trading company that does this verification as the product: factory audits, license files, batch COAs referenced to API Spec 13A test methods, independent inspection, staged payment, one beneficiary name on every document. If you would rather run the checklist yourself, this page is yours. If you would rather receive it done, send us your product list.