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SiSiB® PC5420 SiSiB SILICONES SiSiB® PC5420 is a colorless, low-viscosity liquid with an SiO2 content of 28.5%. It is the ethyl ester of orthosilicic acid. It may be used as an inorganic binder for refractory fillers and pigments, like precision investment castings; as a second back...view more SiSiB® PC5420 is a colorless, low-viscosity liquid with an SiO2 content of 28.5%. It is the ethyl ester of orthosilicic acid. It may be used as an inorganic binder for refractory fillers and pigments, like precision investment castings; as a second backup casting coating; as a binder in zinc-rich (corrosion resistant) coating; as a starting material for sol-gel process; as a crosslinking agent for silicone sealant; as a drying agent in sealing compositions; or as a chemical intermediate. view less