For siliconizing glass surfaces use Thermo Scientific™ Hydrocarbon Soluble Siliconizing Fluid. This short chain, clear polymeric silicone fluid consists primarily of dichlorooctamethyltetrasiloxane and is soluble in organic solvents. When applied to glass, quartz or similar products, the unhydrolyzed chlorines present on the chain react with surface silanols to form a neutral, hydrophobic and tiightly bonded film over the entire surface. It is excellent for modifying metals, certain plastics, ceramics and fiber optics.