I feel your pain. In the past I've had to deal with the "technical staff" at XXXXXXXXX to find out some straighforward info about one of their products. Had to go thru multiple layers heading "up the chain of command" before I found someone who actually had a techincal clue. I finally just asked for one of the ceramic engineers on their staff... if they had one. It took that to finally get to someone who knew more about techincal ceramics than I did. Pain in the butt to get accurate answers.
Oh... and that person totally contridicted the "information" that I kept getting from ALL the lower down folks. 180 degree opposite information. And backed it up with information so that I knew HE was right and all the others WERE wrong.
Most folks would have likely stopped with the first level of "technical staff".... and gotten totally wrong information. Caveat emptor with ALL suppliers.
And remember that the supplier / manufacturers do NOT indemnify you from liability with using their products. You are responsible for testing if the product is suitable for the uses you put it to on YOUR products (for which you are liable).
Professor of Ceramics; New Hampshire Insitute of Art
Guest Professor, Wuxi Institute of Arts and Science, Yixing, China
Former President and Past President; Potters Council