Join Date: Jul 2005
Location: AJAX not the soap, Canada
Bikes: 05 Specialized"Roubaix" Campy 10spd.
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As you already acknowledged, Silicone (spray) is not a suitable lube for a chain (metal to metal) applications. The Silicone molecule is not shear stable nor durable enough. However, in mixed "softer" applications such as plastics to plastics or plastics to metal and cable sheathing it can shine.
Because of the fluid nature and the liquid carrier, Silicone sprays have good creeping capabilities that allows for the lube travel deep into otherwise difficult areas to reach.
As a moisture protectant ????? you will get some water displacement capabilities with the surfactants in the carrier and some (RP) moisture protection also, depending on the formulation.
Silicones are inert and by themselves will generally cause no compatibility issues with most rubbers or plastics. It's the petroleum distillates used as a carrier that may have issues, but I wouldn't worry about it, they are generally not as harsh as say, WD40. I use a Food Grade Silicone for cables. It goes without saying, don't get any Silicone on the brake pads or rim.
Last edited by Stv; 09-27-05 at 08:34 AM.