LOL Steve on the first ten words of your original post!
I think your question is a good one and I think there are two levels of answers.
1.) The First Level - Quality Beer: - Your nose and tongue should tell you if you have a blatant problem using a plastic in any part of your brewing process. To be on the safe side, I really would recommend running boiling water through or around any plastic involved in your brewery. If it smells plastic at that temp then I would ditch it especially due to the following...
2.) The Second Level - Health: Just because you cannot smell any plasticisers at 100 degrees, it doesn't mean that you are not exposing yourself or other drinkers of your beer to a long-term health risk. Obviously, if you can smell or taste something, you have an immediate problem. But, we home-brewers use many plastics in brewing including hoses, grain bags, hop socks, BIAB bags and beer lines. (This was the only point I thought worthwhile pursuing in the closed thread.)
As brewers, I assume we would like to see each other live as long as possible and so I think it is a great idea to question the integrity of the plastics in our brewing.
The second level is a hard thing to investigate for us brewers. All we have is our nose and tongue and this is not a good enough long-term answer.
Surely, amongst our brewing community we can access a true expert?
Until then Steve, the only thing you have to rely on is your nose and tongue by doing the boiling water trick. Doing this should guarantee you an acceptable beer but cannot guarantee any long-term health risk.
Don't often sign off this way but...
Take care,
PP