MY Polymers

OF-140-N: Optical Fiber Coating

OF-140-N is a low refractive index optical fiber coating, developed for the cladding of optical fibers. The material is designed to be compatible with Optical fiber Drawing Towers.

The extension N denotes there is No adhesion promoter in the formulation. This allows a longer shelf life, but adhesion under wet conditions is lower.



  Liquid state
RI liquid at 589 nm 1.394
Density, g/cm3 1.44
Viscosity, cps @ 25°C 3300
  Cured state
RI cured at 589 nm 1.407
RI cured at 950 nm 1.401
Adhesion to fused quartz, 90° Peel, g/cm 130
Elastic modulus,  MPa 250
Tensile Strength, MPa 10
Elongation at Break, % 35

The product is supplied pre-filtered to below 1 micron particles.


  1. Avoid unnecessary exposure to ambient light and moisture.
  2. Long-term storage should be at ambient conditions of 10-30ºC.
  3. The coating is supplied in glass bottles. Keep the container closed to avoid moisture penetration.
  4. The shelf life is 12 months.


OF-140-N is intended to be used in optical fiber drawing towers. The UV curing is done under nitrogen. Typically, a dose of 1000-2000 mJ/cm2 is necessary. Any UV source in the range 300-400 nm can be used. When properly cured under nitrogen, the surface should be non-tacky.

Keep the bottle closed in all times when not in use. The material is sensitive to light.

Safety: Refer to the SDS


Note: The above information is believed to be reliable, but it is not to be taken as a representation, warranty or guarantee. Customers should perform their own QC, QA, and evaluation tests.


Updated:  October 16, 2023