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As to the Chinese partners ,yes,most of the American firms have parter firms in China, while as you said ,the partner cost will be increased much especially,because both of them are growing at the same time ,so the American firms will turn to the new parters,that's why they will get so many introduction emails every day. Hope this comments would help all to understanding Chinese factories and try your best to be patience to commuction with them ,then you will found you get exceed your expection. If you are a seller, do you know what are the customer's mostly concern aspects on selecting an plastic injection mold maker in China? If you are a buyer, how do you select a reliable mold maker in China? You have to look at the part for starters. What is it, and what are the expectations on quality and use of the finished product. Obviously you would not want to use regrind product on a class a surface, or any type of show part that is not painted or plated in some form or fashion. Part size, and cycle time are also crucial to determining material delivery methods. I have found using different materials for tooling components will also decrease cycle times by as much as 40%. There is alot to be said with the initial mold design pertaining to cost of components, the mold build and cycle time saved. Many customers wont spent the extra revenue on the proper manifold system, heat pipes, or even AmpCo inserts. To best determine what is best for the overall performance of the mold and production of parts, you should consult a full service tooling supplier. Collect the data and make sure there is correlation of the variables (i.e., change in ambient air temp and humidity) and weld line strength before mold making process or mold changes or else you may be 'chasing your tail'. There is one assumption here as well and that is an unanswered question: Did, at one point in time, the weld line strength ever meet or exceeded the requirement? If it never has, then try everything.