MY Polymers


OF-140-N3 is a low refractive index optical fiber coating, developed for the cladding of optical fibers. The material is designed to be used in Optical fiber Drawing Towers.

OF-140-N3 is a new version of OF-140-N. It has better adhesion and higher modulus.  In addition, OF-140-N3 does not have the strong acidic odor of OF-140-N. It should provide a more comfortable working environment.



  Liquid state
RI liquid at 589 nm 1.396
Density, g/cm3 1.43
Viscosity, cps @ 25°C 3700
  Cured state
RI cured at 589 nm 1.409
RI cured at 950 nm 1.402
Adhesion to glass, 90° Peel, g/cm 150
Elastic modulus,  MPa 330
Tensile Strength, MPa 11
Elongation at Break, % 40

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-N3 is intended to be used in optical fiber drawing towers. UV curing is done under nitrogen. Typically, a dose of 1000-2000 mJ/cm2 is necessary. Any UV source in the range of 300-400 nm can be used. When properly cured under nitrogen, the surface should be non-tacky.

Keep the bottle closed at 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