The safety data sheet supplied by Abbey to WILBA lists silica as being a product of burning the compound/s in the lubricant. It isn't actually a list of contents (ingredients) but it would point to the fact that there is silicon in the compounds in the product. The safety data sheet doesn't have to itemise non-hazardous contents and hence Abbey have chosen to say simply that it contains a mix of organic and inorganic compounds none of which are hazardous according to current definitions.