MY Polymers

LM-155 : Optical Coating / Adhesive

LM-155 is a UV curable coating/adhesive with the refractive index of 1.55. The main application is recoating optical fiber splices and optical fiber components such as cladding power strippers. The material was optimized for curing by both UV LED and UV Mercury lamps.

LM-155 has a low modulus, which reduces stress during thermal cycling and under thermal shocks, resulting in improved reliability. The viscosity was designed for optimal results in both recoating units and manual recoating.


Liquid state
RI liquid at 589 nm 1.532
Density, g/cm3 1.12
Viscosity, cps @ 25°C 2500
Surface tension, dyne/cm 25
color Clear, yellowish
Cured state
color Clear, yellowish
Transparency 450-1600 nm, 300-micron film 99%
RI cured at 589 nm 1.550
RI cured at 1550 nm 1.542
Adhesion to silica, 90° Peel, g/cm 800
Secant Modulus @2.5% 30
Young Modulus, MPa 60
Tensile Strength, MPa 5
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
  2. Long term storage should be at ambient conditions of 10-30ºC.
  3. The shelf life is 12


Curing can be achieved by any UV source at 300-400nm. Typically, a dose of 500-2000 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.