Water and Oil Repellent Finishes

Water repellent finishes create hydrophobic surfaces via fluorocarbons, silicones, wax, or dendrimers preventing water penetration while maintaining breathability essential for rainwear and outdoor textiles. Fluorocarbon finishes achieve water contact angles >140° and oil repellency ratings 6-8 but face environmental restrictions due to PFAS persistence. Alternatives include silicone-based treatments (contact angle 110-130°, wash durable 10-30 cycles, eco-friendly), dendrimer-based fluorine-free options (comparable performance to C6 FC), and bio-based waxes. Testing via AATCC 22 spray test (rating 80+ for rainwear) and AATCC 118 oil repellency scale. Applications span outdoor apparel, workwear, upholstery, and medical textiles requiring fluid resistance.