EGZ-SD65WH is a clear, colorless, silicone, optical coupling compound that features excellent light transmission and low evaporation and bleed at 25 degree C, and it has a specific gravity of 1.12 and 1.467 index of refraction. EGZ-SD65WH is for optical coupling of photosensors to scintillators and light guides, for example the coupling of photomultiplier tubes. Projector picture tube filling, oil exploration tools, electronic components, optical fiber bonding, filling and fixing, etc.