Whether you are buying a container of chemicals or selling one, the first thing you want is not to be cheated: that the money is safe, that the goods are real, and that the other side honours the deal. That is what all the negotiation is actually for. The price is the visible part of it. The part underneath is both sides working out whether the person they are dealing with is real.
This is an odd thing for a supplier to publish, and it is worth saying why I publish it anyway. Most of what is written about trading with China is written by sellers describing themselves. I sell chemicals, and I am also the person who has sat on the buying side and got it wrong. That is the reason these notes are worth a buyer's attention: they come from the failure, not from the pitch.
One thing to say up front, because it is where people expect a list: there is no complete checklist. Even people with twenty years in this trade do not have a systematic standard for judging a company, and the ones who are certain they do are the ones who get hurt. A checklist raises the odds slightly and then makes the risk feel handled. What follows is judgement, written down, so that at least it is somebody's judgement and not a generic list — and so that you can read the person selling to you by what he has seen, rather than by what he promises.