Lots of interesting comments here.
Konst: Larry Carly has an entire library of automotive topics here:
http://www.aa1car.com/library.htm He talks with authority,his articles are generally good, but when it gets to the fine details, I get the impression that
he often states HIS opinion, which might differ from others. His coolant articles are similar. Excellent info, but sometimes not perfect.
IE, he generally recommends to use one type (silicone) grease for "rubber enclosed brake areas" (caliper pins) and another type (high solids) for metal to metal, exposed to elements areas (pad backs). Yet, Ford and many others recommend their silicone grease for both areas.
Who's more correct?
REF: read Ford TSBs:
http://www.fcsdchemicalsandlubricants.co...ategory=Greases
Labman: Regarding PAO types, all I can say is that the packaging claims compatibility with rubber brake components.
Sil-glyde is a mystery product. Unlike other silicone lubes, it turns yellow exposed to light/air. It's MSDS is vague since polypropylene glycol is it's main ingredient, it appears to have castor bean oil (yellowing?), and little mention of polysiloxane? I have seen different labeling that shows 425 and 600 degrees F. IMO, it is not a true silicone lubricant like the Ford or Dow products.
Ref.:
http://www.agscompany.com/downloads/msds/sil-glyde_lube_compound_-_020107.pdf (MSDS)
http://www.agscompany.com/products.php?line=5&category=17&subcat=97&product=212 (425 degree F)
SteveS: On this rare occasion, I agree with your comment. Unless we get some real experts here, we are left with incomplete MSDSs and anecdotal stories. Much the same with oil, filters, etc., etc., etc.. It's tough for OCD types seeking truth over opinion when the "experts cannot agree". It really becomes a biased, personal decision based on incomplete information.