Fluorosilicone products (FLS) combine the corrosion resistance of fluororubber with the elasticity of silicone rubber, making them suitable for specific extreme operating conditions. When selecting, consider the following factors:
Temperature Range: Fluorosilicone withstands temperatures ranging from -60°C to 200°C, performing exceptionally well in environments with alternating high and low temperatures (such as aviation fuel systems). Avoid prolonged use below -60°C to prevent a loss of elasticity.
Media Compatibility: Its fuel oil resistance is five times greater than that of ordinary rubber, making it suitable for petroleum-based media or highly corrosive environments. However, ketone solvents may cause failure, so compatibility testing is a priority.
Cost and Processing: Raw material and production costs are high, and processing requires precise control of the mixing and vulcanization processes. For non-essential applications (such as ambient temperature oil seals), switching to nitrile butadiene rubber (NBR) or hydrogenated nitrile butadiene rubber (HNBR) can save 40%-60% in costs. Application Compatibility: This material is only suitable for extreme operating conditions (such as engine intake and exhaust systems and highly corrosive media). For conventional environments (such as food processing machinery or low-pressure seals), EPDM or silicone rubber is recommended, while perfluoroelastomer is more suitable for ultra-high temperatures (-196°C to 320°C) or highly acidic environments.

Before selecting a material, verify the dynamic sealing pressure (reinforced material is required for applications >32 MPa) and thermal expansion compensation to avoid failure due to material mismatch.