Signet Armorlite is the latest company to join PPG's new CR-39 Licensed Lens Caster Program, which was created earlier this year to honor the 60th anniversary of its patent for the CR-39 monomer. The company was named to PPG's new club at the recent Optical Laboratories Association's (OLA) exhibition and conference in the USA. Signet Armorlite joins about a dozen other companies from throughout the globe.