TCNA logo


A3263 2021 coverThe American National Standard A326.3 describes the test method for measuring dynamic coefficient of friction (DCOF) of hard surface flooring materials in the laboratory and in the field. The standard also includes DCOF specifications, product use classifications, and guidance on specifying hard surface flooring materials. This standard is intended to serve as a guide to the general public, manufacturers, distributors, specifiers, architects, contractors, testing laboratories, building owners, and other businesses and professionals.

An electronic copy of the standard is available for free. To download a copy, click the link below.

History of ANSI A326.3

Since 2012, the DCOF AcuTest® has been the ceramic tile industry standard for testing dynamic coefficient of friction (DCOF).  The method was contained in section 9.6 of ANSI A137.1, the American National Standard Specifications for Ceramic Tile. Although initially developed for ceramic tile floors, the methodology was equally applicable and useful with other hard surface flooring.  With facility managers, inspectors, cleaning professionals, and forensic engineers using the method increasingly in the field, ANSI A326.3, Test Method for Dynamic Coefficient of Friction of Hard Surface Flooring Materials, was developed based on the DCOF AcuTest® and released in 2017.

Whether you’re manufacturing, specifying, selling, installing, or maintaining hard surface flooring material, it’s important to know its DCOF. Need help? Our lab runs the A326.3 test. Send us your product today or call regarding in-situ testing. Click here to have your product tested by TCNA!


Standard and Supporting Information

ANSI A326.3 Dynamic Coefficient of Friction of Hard Surface Flooring Materials

ANSI A326.3 Sensor Preparation Instructional Video

ANSI A326.3 Frequently Asked Questions (FAQs)


ANSI A326.3 Product Use Classification Press Conference Presented at the 2022 International Surfaces Event (Released 2022)

National Standard, ANSI A326.3, Now Requires Hard Surface Flooring Manufacturers to Provide Product Use Classifications Based on their Slip Resistance Properties (Released 2022)

Slip and Fall Study Report: Enhancing Floor Safety Through Slip Resistance Testing, Maintenance Protocols and Risk Awareness (Provided courtesy of CNA; Copyright © 2017 CNA) (Released 2017)

Research Supporting an ANSI American National Standard for Slip Resistance (Released 2016)

TCNA Technical Bulletin - Coefficient of Friction and the DCOF AcuTest® (Released 2013)

Coefficient of Friction: New Method, New Requirements - Introducing the DCOF AcuTest® (Released 2012)

Introducing the New Standard for Measuring Coefficient of Friction (Released 2012)

Coefficient of Friction: Time is Running Out, Don't Get Left Behind (Released 2013)

DCOF: Legal Liabilities: Stopping the Falls, by Elianne Halbersberg (content not provided nor approved by TCNA) (Released 2013)

Introduction of DCOF: Stranger Than Friction, by Robert Nieminen (content not provided nor approved by TCNA) (Released 2013)

What is Friction, and How Does it Relate to Slip Resistance, by Jim Neel (content not provided nor approved by TCNA) (Released 2013)