1. Silicone is a biologically active and toxic substance.
The original statement by the Dow Chemical Company in the 1940s, repeated hundreds of times since, that silicone is biologically inert and nontoxic, was based on a single one-week study of rats and guineas pigs. (In 1943, Dow Chemical Company and Corning Glassworks formed Dow Corning Corporation to market silicone and silicone implants.)
The basic gel implant filler DC 360 silicone fluid was once considered worth following up for development by Dow Corning scientists as a potent insecticide, one of the few known substances capable of killing cockroaches.
Dow Corning researchers also studied silicone as a possible better chemical warfare and riot control agent, according to a 1969 internal memorandum obtained by the PSC.
The silicone gel is not a single substance but a fluid comprised of numerous different versions of silicone, such that it is better termed a chemical soup