| Business | Phone |
| Allied Mineral Products 201 Mississippi St # 14, Gary 46402 | (219) 881-7781 |
| Glasrok Products 201 Mississippi St # 18e, Gary 46402 | (219) 886-7050 |
| Harbison Walker Refractories 1000 N Clark Rd, Gary 46406 | (219) 949-1546 |
| North American Refractories Co 76 N Bridge St, Gary 46404 | (219) 883-3335 |
| One Eight Seven Inc 1050 Michigan St, Gary 46402 | (219) 886-2060 |
| George E Snyder 1000 N Clark Rd, Gary 46406 | (219) 949-1544 |