The main characteristics of a hydro- and oleophobic coating are:
• Practically maximum possible contact angles for a planar surface (117 deg. for a drop of water and 70 degrees for hexadecane).
• Transparency (monolayer hydro- and oleophobic films do not absorb in the visible and IR ranges);
• High resistance to abrasion (coatings are not destroyed under significant mechanical loads, withstanding up to 10,000 cycles of abrasive wear with steel wool at a load of 10 N. At the same time, the contact angle of glass surface wetting with water is within 117-105 °). Tester work video
• Stress resistance (coatings withstand thermal shock from minus 40 to plus 85 ° C, 30 cycles, one cycle time 5 minutes)
• Light fastness (72 hours at a distance of 20 cm from a 15 W lamp generating UV group B radiation)
• Stability in humid conditions (72 hours at 95% humidity and 50 ° C)
• Resistance to organic solvents (250 friction cycles with a load weight of 0.5 kg, abrasion strip length L = 15 mm, speed v = 20 mm / s, methanol spraying after every 50 cycles)
• Stability to emulsions (Nivea Sun Spray SPF30, aging at 80 ° C and humidity 80% for 24 hours)
• Acid resistance (pH 4.6; aging 48 hours)
• Inert to salt water (keeping in 5% NaCl solution for 10 days at 35 ° C with checking the result every 3 days).