Hi jankdc,
No … I don’t think Chengda (or Chengdahm) makes the latex they sell. Some of the people who ordered it received it with labels still attached and at least in one instance it was Arpico Dunlop (see here) and in others they knew enough to be able to tell it wasn’t Talalay although they may just be supplying whatever they can get their hands on and it could also change from time to time for all I know. Every layer I’ve seen pictures of has been Dunlop.
I do suspect they manufacture the polyfoam that FBM supplies though and that http://www.rollsheetrubber.com/html.aspx?id=202 probably supplies whatever latex they sell (their picture has the pincore pattern that looks more like what they sell and they also call it Talalay which is where the misdescription may originate) but they probably get it from somewhere else (it appears that they deal with multiple suppliers because they don’t manufacture their own foam).
Phoenix