Technical Support

  • UV curing in an Inert Atmosphere

    UV curing in an Inert Atmosphere

    This video shows MY Polymers low refractive index coating OF-133, being cured inside a Nitrogen chamber on an optical fiber drawing tower. The fiber, that was just coated by the OF-133 is entering the UV curing section. UV curing is done in such inert conditions to minimize Oxygen competition.
  • How to coat

    How to coat

    This video shows how to produce an even, thickness controlled coating, using simple means
  • Low Refractive Index Demo

    Low Refractive Index Demo

    This video demonstrates the MY-133-V2000 index of 1.33, which is identical to water. The fish was produced by UV curing inside a transparent mold with small grooves, to create opacity that enhances the optical effect.
Ask a Technical Question

Technical Support

Technical Support

At MY Polymers - The Low Refractive Index Company, we do our best to be responsive to our customers.

Any technical issue which arises either before or after you get our materials and start working with them can be discussed directly with our technical staff.

Simply press the red button marked ASK A TECHNICAL QUESTION and you'll be asked to describe the issue at hand.

Some technical questions and issues tend to appear more frequently than others.






Selecting the right product


See our guide

How to Select the Right 

Low Index Adhesive





Curing and Inerting


How to get a good curing?

How to get a good inerting

and why is this needed? 

See Inert Atmosphere Guide






See our video "How to Coat"

If you need to fine-tune the

coating thickness 

(or to decrease the viscosity)

see How to Dilute


Spin Coating



If you plan to do a spin

coating click here:

Spin Coating





Refractive Index Vs. Wavelength:


See a typical example - The RI Vs. Wavelength graph for MY-133

See another typical example - The RI Vs. Wavelength graph for LM-145





Transmission Vs.



See the transmittance curves for 4 materials OF-133-V3, OF-136, OF-1375-A and OF-139-N (they represent other products with the same RI): Transmittance Curves








High-resolution imaging of cellular processes across textured surfaces using an indexed-matched elastomer





High performance, LED-powered,

waveguide-based total internal

reflection microscopy





Easy Fabrication of Thin

Membranes with Through Holes.

Application to Protein Patterning





A polymer gel index-matched to water enables diverse applications in fluorescence imaging





Cascaded Cladding Light Extracting Strippers for High Power Fiber Lasers and Amplifiers





Soft lithography fabrication of index-

matched microfluidic devices for

reducing artifacts in fluorescence

and quantitative phase imaging




Direct characterization of the evanescent field in objective-

type total internal reflection

fluorescence microscopy




Development of a water refractive index-matched microneedle integrated into a light sheet microscopy system for continuous embryonic cell imaging






Our recoating materials are used intensively in the construction of fiber lasers. Splices which are created during the fiber laser assembly process, have to be recoated. Likewise, each component used in the assembly of a fiber laser has to be recoated and encapsulated by a recoating material.


Currently, the most common optical fibers (both active and passive) use primary coatings with an index of 1.36 (e.g. OF-136), recoating materials with the same index 1.36 are very common in recoating applications. Typically, 1.36 index materials are used for recoating splices, Pump Power Combiners, Couplers, and FBG (Fiber Bragg Gratings).

For Cladding Light Strippers (Called also Cladding Power Strippers), a higher index is required, because the idea to strip the cladding modes and get rid of them. During the last few years, we see an escalating trend to use Cascaded Cladding Light Strippers. In this  Cascaded CLSs enables to distribute the power more evenly along the whole length of a CLS device. This prevents the formation of a high-temperature hot spot. Instead, multiple hot spots with significantly lower temperatures are formed, enabling the whole device to remain cooler.

The following drawing shows the various applications for our recoating materials.




Our Primary Coatings are used by the leading manufacturers of specialty optical fibers. The drawing on the right shows the point in the drawing tower where our primary coatings are applied.

Our best selling primary coating is OF-136, with a refractive index of 1.36.  OF-136, as well as most of our other primary coatings, include our own proprietary adhesion promoter, which improves adhesion, especially under wet conditions (Hot water immersion; 85C/85% RH;  Autoclave testing).

Other notable products include OF-1375-A, OF-138, OF-140-N and the breakthrough primary coating OF-133-V3, with an index of 1.33.



Required field