AEROSIL® FUMED SILICA – ADVANTAGEOUS FOR OPTICAL PROPERTIES
AEROSIL® fumed silica offers far more than an attractive appearance
Smooth, glossy surfaces
AEROSIL® fumed silica lets you keep things in view
Thanks to AEROSIL® fumed silica, silicone rubber is colorless and highly transparent. This has resulted in the material being used in a wide range of applications on purely esthetic grounds. Silicone rubber can be pigmented to almost any color, but highly transparent formulations are also commercially available. These are used for medical applications, such as tubes and catheters, but are also preferred in products for daily use such as nipples for baby bottles and diving goggles because they allow visual checking.
The transparency of such formulations is controlled essentially by two factors: the particle size of the silica and the refractive index of the polymer or filler. AEROSIL ® grades such as AEROSIL® 300 having a relatively high active surface area are especially suitable for highly transparent silicone systems. By modifying the fumed silica surface with silanes or silicones, the refractive index can be adjusted so that it is similar to that of silicone rubber, improving the transparency of the silicone system.
AEROSIL® R 106 and AEROSIL® R 812 S are examples of extremely hydrophobic materials that allow high-transparency products.