MY Polymers

RCT-155: Optical Coating

RCT-155 is a low-modulus UV curable coating specially designed for recoating in a mold. The
material was optimized for curing by both UV LED and UV Mercury lamps. A typical application is recoating for optical fibers. The adhesion level was optimized for the ease of release from re-coating molds.


Liquid state
RI liquid at 589 nm 1.533
Density, g/cm3 1.12
Viscosity, cps @ 25°C 3000
color Clear, yellowish
Cured state
RI cured at 589 nm 1.550
RI cured at 950 nm 1.540
Adhesion to silica, 90° Peel, g/cm 80
Secant Modulus @2.5% 34
Young modulus,  MPa 52
Tensile Strength, MPa 7
Elongation to Break 100
Linear shrinkage, % 2.0

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 15-30ºC. Do not refrigerate. The material may
    show haze below 10ºC. It will clear up upon warming back to ambient conditions.
  3. The shelf life is 12 months.


Curing can be achieved by any source of UV at 300-400nm. Typically, a dose of 1000-2000 mJ/cm2 is necessary.

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: April 16, 2023