How do I start ordering custom silicone and rubber parts from a Chinese factory?

A workable first order follows the same sequence in every category: fix the specification in writing including tolerance and finish; decide the quantity against the minimum above; get a physical sample approved before any mass production; agree tooling ownership and payment terms in writing; arrange inspection before the balance is paid; and confirm the HS code and the destination labelling requirements before the goods ship rather than after. For custom silicone and rubber parts the two details that most often delay a first order are suppliers quoting "food grade silicone" without a test report. Ask for the specific compliance document, not the phrase and silicone colour matching is done by adding pigment; a tight Pantone match can shift between batches. Approve a physical sample and a tolerance.