LM-136-EA : Low Modulus Optical Coating / Adhesive
LM-136-EA is a low refractive index UV curable coating/adhesive. It includes MY Polymer’s proprietary adhesion promoter, which improves its adhesion, especially under wet conditions. A typical application is re-coating a stripped optical fiber that was originally produced with our Primary Coating OF-136. The material index was designed to perfectly match OF-136.
LM-136-EA is a far better recoating material, compared to OF-136. Its adhesion is more than 3 times higher and its modulus is 5 times lower, compared to OF-136. The combination of these 2 properties ensures a much higher endurance under thermal cycling.
Note: Due to the need for stripping capability, MY Polymers intentionally limited the adhesion of OF-136. Due to fiber robustness requirements, the modulus of OF-136 was set to a relatively high value. The requirements from a Primary Coating are in contradiction to the requirements from a first-class RE-coating material.
Properties
| Liquid state | |
| RI liquid at 589 nm | 1.359 |
| Density, g/cm3 | 1.52 |
| Viscosity, cps @ 25°C | 1400 |
| Cured state | |
| RI cured at 589 nm | 1.369 |
| RI cured at 950 nm | 1.363 |
| Adhesion to glass, 90° Peel, g/cm | 225 |
| Elastic modulus, MPa | 17 |
| Tensile Strength, MPa | 4 |
| Elongation at Break, % | 80 |
| Hardness, Shore A | 70 |
The product is supplied pre-filtered to below 1 micron particles.
Storage
- Avoid unnecessary exposure to ambient light and
- Long-term storage should be at ambient conditions of 10-30ºC.
- The coating is supplied in glass bottles. Keep the container closed to avoid moisture
- The shelf life is 9 months.
Application
Curing can be achieved by any source of UV at 300-400nm. Typically, a dose of 1000-2000 mJ/cm2 is necessary.
To prevent tackiness on exposed surfaces, it is recommended to cure in an inert atmosphere (e.g. under nitrogen). There is no need for an inert atmosphere when curing between two layers or in a mold (more on inert curing on the Technical Support page on our website).
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: March 4, 2018
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