ccatceimy

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