Part of my job is to keep siloxanes out of a complex, multi-step, multi-sub-contracted manufacturing process. A supplier change that should have been a simple affair has cost us several kilobucks in analyses in the past months. I hate the stuff.
Since the switch to euro, I think the most commonly accepted value of one "brique" is (unofficially) 10 000 €, but the uncertainty makes it basically useless.
I can't recall I've heard "brique" used since the switch to € but it might just be my local bubble
(The only person I know that still used «briques» in these decades were my grand parents born in the 1920th)