Due to its unique molecular structure (Si-O backbone and fluorocarbon side groups), fluorosilicone oil rapidly penetrates the interstices between leather fibers. Its low surface tension (approximately 15 mN/m) allows the oil to spread spontaneously, and the fluorine atoms form weak hydrogen bonds with the amino groups in collagen, achieving deep penetration without disrupting the leather's original pore structure. This permeability offers three advantages:

Soft touch: The siloxane segments form a flexible film on the fiber surface, reducing the coefficient of friction by over 40%.

Durable water resistance: The fluorocarbon layer creates a nanoscale hydrophobic barrier with a contact angle of up to 110° (ASTM D7334 standard).

Enhanced weathering: The C-F bond energy (485 kJ/mol) imparts resistance to UV rays and chemical corrosion.

In actual production, the coating weight should be controlled between 1.5-3.0 g/m². Combined with a hot air cure at 60°C for 30 minutes, the leather's water pressure resistance can be increased to over 15 kPa (ISO 811 standard).

Research and Development Trends in Environmentally Friendly Fluorosilicone Fluids
New bio-based fluorosilicone fluids (e.g., containing 30% renewable raw materials) have been commercialized with VOC levels below 50 g/L (EPA Method 24) while maintaining the performance of traditional products. One international brand demonstrated that using this technology reduced the carbon footprint of leather products by 22% (LCA assessment).