Harvard Chemical Research Stone Impregnator 407 is an aqueous fluorochemical (Teflon) dispersion that does not contain any silicone or wax components. This product is a water based, penetrating, low VOC sealer that provides an invisible, durable barrier against water, oil and stains on all porous masonry surfaces. This sealer has a natural look that does not affect the appearance of the substrate. Water based. Resistant to oil and water based stains. Does not affect slip resistance. Can be applied to damp surfaces. Advance fluoro-chemical technology. Non-flammable. Excellent for grout joints. Clear liquid appearance. Low odor. Specific gravity: 1.01. pH: 7-8.