The OKP plastics are high purity, polyester polymers with refractive indices ranging from 1.61 to 1.65.  These materials are always improving. 

The 1.64 refractive index material is in stock at FOC with extremely low birefringence.   Birefringence in polymers is predominately the result of molding process.

Additional resources from the FOC team include:

Have questions about this FOC Tip?

Contact FOC with questions at: (800) 473-4237 / 508-992-6464 or email: and we will respond ASAP. 

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