... , 200, 250mm etc 1, Our acrylic balls offer high light transmittance with a Refractive Index of 1.49 and can ... exposure to moisture, or even total immersion in water, does not significantly effect the mechanical or optical properties of our acrylic ... , adverting displays , photo frames, slatwall displays, shelf rackes , domes, light boxes and so on; 2, Plastic mould injection products, includes ...