The most important characteristics are:
1. Transparency, (low attenuation)
2. Refractive index equal to that of the fiber.
Currently, gels must be manufactured in class 10,000 cleanrooms.
Tests performed on current index gels have demonstrated exceptional stability against all types of aggression. These highly stable materials operate within a temperature range of -50°C to +250°C and are inert to chemical action, exhibiting low evaporation of their components. Their viscosity prevents them from flowing and shifting. Optical characteristics such as refractive index and transmission remain well below industry-standard limits.
