| Business | Phone |
| Chicago Paper Testing Lab 3356 Commercial Ave, Northbrook 60062 | (847) 480-1670 |
| Underwriters Laboratories Inc 333 Pfingsten Rd, Northbrook 60062 | (847) 412-0136 |
| Northland Laboratories Inc 1818 Frontage Rd, Northbrook 60062 | (847) 272-8700 |