Ultra-lightweight: Pure titanium has a density of 4.5 g/cm³ (data source: International Titanium Association), only 50% of that of stainless steel,
providing a comfortable fit even after prolonged wear. For example, a pair of titanium frames typically weighs 8-12 g, while ordinary alloy frames usually weigh 15-20 g.
High Strength and Durability: Titanium has a tensile strength of 200-1000 MPa (depending on the alloy type), far exceeding that of ordinary aluminum alloys (approximately 200-300 MPa), making it resistant to deformation even when made into ultra-thin temples.
Corrosion Resistance: The naturally formed oxide film on the surface of titanium resists corrosion from sweat, seawater, etc. Experiments show that titanium showed no rust after 1000 hours in a 5% salt spray test (refer to ASTM B265 standard).
Low Allergenicity: Medical-grade titanium (such as Gr2 pure titanium) has a nickel release of less than 0.1 μg/cm²/week (EU EN1811 standard), making it suitable for sensitive individuals. Ordinary alloy frames may release more than 1 μg/cm²/week of nickel, easily causing skin redness and swelling.
Temperature adaptability: Titanium has a low thermal conductivity (17 W/m·K), so it does not produce a noticeable cold feeling when worn in winter, and it is also not good at conducting heat in summer.
