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 controled 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. Click the links below to download documents covering some of these issues:


Selecting the right product: See the document  How to Select the Right Low Index Adhesive

Curing and Inerting of low refractive index UV cured polymers:  How to get good curing?  And how to get good inerting (and why is this needed anyhow)?  See our  Inert Atmosphere Guide

Coating:  See the Video "How to Coat". If you need to fine-tune the coating thickness (or to decrease the viscosity) See the document  How to Dilute. 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 MY-143 and MY-145;

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


A brief  review of  major applications:


Recoating materials:

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.

Optical Fiber Primary Coatings (Cladding Resins):

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, with an index of 1.33.


  • What types of products technology are available from MY Polymers

    Our technologies include UV Cured; Moisture Cured; Hot melt; Solvent-based; and Pressure Sensitive.

    Most of our materials are UV cured; Few are moisture cured. 

  • Why does the material remain tacky after UV curing ?

    The most common reason is lack of inerting. Inerting means you have to prevent/minimize exposure of the material to air during curing (when the UV lamp is on).  For more details, see the video "UV Curing and INERTING" in the video gallery.

  • How thin can I coat your products ?

    The thickness of the finished coating can be controlled by 2  means:

    The first is obvious - by controlling the thickness of the material you are applying such as the use of doctor blade with thin spacers (see the video titled "How to coat in the video gallery below). The thickness of the coated wet material is about 60% of the thickness of spacers. This figure may vary to some extent, due to fluid dynamics effects (the speed of moving the coating bar, the viscosity of the material, etc.)

    The second tool is to dilute the material. By diluting you can get very thin final coatings. The principle is that by diluting, the solids content is decreased. For example, if you dilute the original material to 10% solids (90% solvent), and you coat it to (wet ) thickness of 10 microns, then, after the solvents are evaporated you'll get a 1 micron (wet) thickness. Now you cure it and you get a 1 micron cured (dry) thickness. (Nearly, because the material shrinks by few percents during curing)1 micron.

    For more details click on the link "How to Dilute" above.

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