XYSIL® fumed silica is an efficient reinforcement and rheology control additives for silicone rubber.
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 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.