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.
SPECIFICATIONS:
| 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 |
| Stock colors | See Lagado Products Guide |