NuSil Technology Inc. is offering a line of 1.57 refractive index materials. LS-5257, an optical fluid composed of chemically inert synthetic polymers, is suitable for projection display components. LS-3357 is an ultraclear encapsulation gel made of a synthetic polymer fluid designed to protect electro-optical components from dust, moisture and mechanic vibration. SL-1259 is a noncuring thixotropic optic gel for use in flat panel displays and optically clear matrix media. And LS-6257 is a curable optical thermoset for cast or injection molding.