XYSIL® fumed silica is an efficient reinforcement and rheology control additives for silicone rubber.
Benifit from the unique particle characteristics, XYSIL® fumed silica delivers superior reinforcement while having a relatively minor impact on transparency. The silicone rubber performance is impacted by primary particle size, aggregate size, and surface chemistry.
Xunyu offers a range of untreated fumed silica for optimum performance in silicone applications including:
- Room Temperature Vulcanizing (RTV) Silicone Sealant
- High Temperature Vulcanizing (HTV) Silicone Rubber
- Liquid Silicone Rubber (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.
As the surface area of fumed silica increases, so does thickening and reinforcement. However, high surface area XYSIL® fumed silica requires 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.
Fumed Silica XYSIL® for Silicone Rubber
|Sytem||XYSIL® Grade||Concentration in wt.%||Effect|
|RTV-1 Silicone Sealant||XYSIL®150
|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|