Qianyuan 1.56  photochromic monomers This kind of monomers is easy molding, photochromic in high speed and with deep color concentration, and quickly fading. Monomer Properties Appearance Colored liquid Viscosity (CPS/25℃ ) 25 ± 5 Density (g/cm3) 1.048 Refractive Index (nE25 ) 1.514 ± 0.003 Color (APHA ) ≤ 100 Lens Properties Refractive Index (nE25) 1.553 Abbe Number (vE20) 42.0 Density (g/cm3, 25 ℃) 1.156 Volume Shrinkage (%) 9.1 Transpar ency (%) ≥ 90 Transparency after darkening (%) ≤ 30 Glass Transition Temp. (℃) 102 | 
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