December 08, 2022, 08:42:05 AM
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Topic: Liquid with refractive index of 1.490 that is compatible with PMMA/elastomers  (Read 4896 times)

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Offline ccatceimy

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Hi
I am trying to figure out the right liquid to use that has the following properties:
optically clear/colorless
refractive index of 1.490
viscosity of 5cSt or lower at 25oC
compatible with PMMA and either polyurethane elastomers or silicone elastomers.

I have looked at mineral/white oils but can not get to a sufficiently low viscosity and the index value.

Thanks

Offline Stepan

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Hi
I am trying to figure out the right liquid to use that has the following properties:
optically clear/colorless
refractive index of 1.490
viscosity of 5cSt or lower at 25oC
compatible with PMMA and either polyurethane elastomers or silicone elastomers.

I have looked at mineral/white oils but can not get to a sufficiently low viscosity and the index value.

Thanks


Compatibility depends on application, this why it is hard to give you a simple answer.

Quite a few liquids and blends can be prepared to exact refractive index of 1.49. Often you can adjust refractive index by mixing two liquids.  This area is well developed for optical fibers.

Offline ccatceimy

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Thanks for the quick response.
I did some recent reading on the topic and understood that the mixing will work. 
My issue is getting the right family of liquids that are compatible with PMMA and in the right ball-park for index and viscosity.  Any recommendations on chemical families to start with?

Thanks.

Offline Stepan

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Glycerol RI=1.47

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