Silicone is totally different from silica. Silica in its most common form is "sand". Silicone is a name for a class of compounds based on the element silicon. The properties can vary significantly. Silicones are commonly used for lubrication and defoaming applications. 73, Greg-N4CC
Just to be clear, I never said there was silica in silicone grease and I never have heard of any silicone grease being abrasive or having silica.
The only case I know of, unless it is a dirty environment, where silicone grease becomes abrasive is when something actually arcs through the grease and converts some of the grease to silicone-carbide, which is an abrasive.
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