PMMA (polymethyl methacrylate)
The Lagado PMMA (polymethyl methacrylate) contact lens blanks are made from ultra-pure methyl methacrylate monomer. The polymer is highly crosslinked for stability, solvent resistance and ease of machining. Half-inch precision ground blanks are available in a number of tints. PMMA blanks are available in 12.7mm and 17.0mm diameters. The 17.0mm blank is machined with a 1/2" shoulder for blocking.
|Purity (polymethyl methacrylate)||> 99.5%|
|Hardness (Shore D)||D/90|
|Refractive Index (nD, 25°C)||1.495|
|Specific Gravity (g/cc)||1.19|
|Wetting Angle (sessile drop)||25°|
|Oxygen Permeability (Dk x 10-11, 35°C)||< 0.02|