Vredenburgh & Zackowitz, Inc.

Human Factors, Ergonomics, Safety,
Engineering & Organizational Consulting


Coefficient of Friction (COF)


The device used by our firm is the English XL Tribometer consistent with ASTM 1679. This testing is used to evaluate walking surfaces to determine if they are slip-resistant in both wet and dry conditions. We evaluate surfaces consistent with ASTM 1637, the standard regarding safe walking surfaces and ANSI A1264.2, provision of slip resistance on walking/working surfaces.