1. Who are PPG/Intercept's main competitors? PPG isn't the only company that makes glass like Intercept. Visit PPG's Web site (www.ppg.com). Then explore the Web sites of one or more other similar manufacturers. These include Guardian Industries (www.guardian.com), Glass ACH Pilkington (http://www.versaluxglass.com/), and (www.pilkington.com/the+americas/usa/english/ default.htm). On the basis of your experience, answer the following questions (Hint: The NAICS code for Glass Manufacturers is 327211).