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LaRC-SI (Langley Research Center - Soluble Imide) is an imide-based amorphous thermoplastic. It was developed by Dr. Robert G. Bryant, a chemical engineer at NASA Langley Research Center. The LaRC-SI can be used as a dielectric for thin-film sensors, as an adhesive to place diamonds on surfaces to increase thermal conductivity, and as an intermediate layer to allow the placement of metal on aluminium nitride.

One of the unique attributes of LaRC-SI is that when it is exposed to temperatures above its softening point of 250 °C, it cannot be redissolved, yet it maintains its amorphous character and melt processability. As an amorphous thermoplastic, the LaRC-SI can be reformed at elevated temperature and pressures. It can be applied in the form of a spray, spin, dip coating, paint, or spread with a doctor's blade. The LaRC-SI has excellent adhesive and dielectric properties. It can also be recycled.

Potential applications for this material are resin for mechanical parts such as gears, bearings and valves, advanced composites like carbon fiber, high strength adhesives, thin-film circuits, and as a dielectric film for placing electrical components on conductive materials; it has also been used for implantable medical devices.