XYSIL® fumed silica is an efficient reinforcement and rheology control additives for silicone rubber.
As the surface area of fumed silica increases, so does thickening and reinforcement. However, high surface area XYSIL® fumed silica require high shear dispersion equipment to achieve optimal performance. In general, XYSIL® 150 is used in RTV silicone sealant; XYSIL® 200 and XYSIL® 300 are used in HTV silicone rubber and LSR.
In RTV silicone sealant
XYSIL® fumed silica provides thixotropy and reinforcement for RTV silicone sealants, while its shear-thinning property provides thickening and sag resistance at rest or low shear and thinning at high shear for easy application.
In HTV silicone rubber and LSR
XYSIL® fumed silica strengthens the cured rubber, increasing hardness, modulus, tensile strength and tear strength. Unlike other reinforcing fillers, XYSIL® fumed silica can be used in transparent or clear applications.
Fumed silica in Silicone Rubber
|Sytem||XYSIL® Grade||Concentration in wt.%||Effect|
|RTV-1 Silicone Sealant||XYSIL®150||3.0-30||Reinforcement, Thixotropy|
|RTV-molding compound(2 components)||XYSIL®200||3-30||Reinforcement, Thixotropy|
|HTV Silicone Rubber||XYSIL®200||5.0-35||Reinforcement, sag resistance, dispersability, surface quality, life duration|
|Liquid Silicone Rubber||XYSIL®200
|5-30||Rheology control, sag resistance, reinforcement, anti-settling|