If you manage floors in the United States, you may have heard of pendulum testing. It is a well-known slip resistance method, especially in the UK and Australia. But when a U.S. architect, insurer or tile specification asks whether a floor meets the standard, the question is almost always about DCOF, not pendulum values. This article explains the difference and which test fits your situation.
What is pendulum testing?
A pendulum tester swings a rubber slider across the floor and reports a Pendulum Test Value (PTV). It is used under British and Australian standards (BS 7976, AS 4663) and for road surfaces under ASTM E303. The device is large, needs careful leveling, and results depend heavily on slider preparation and operator technique.
What U.S. standards actually require
In the U.S., ceramic tile slip resistance is governed by ANSI A137.1, which points to ANSI A326.3 for the test method. ANSI A326.3 measures wet Dynamic Coefficient of Friction (DCOF) with a portable tribometer and the SBR test foot. For level interior floors expected to be walked on when wet, the reference value is a DCOF of 0.42 or higher. A pendulum reading cannot be submitted as an A326.3 result.
DCOF vs. pendulum at a glance
| DCOF (ANSI A326.3) | Pendulum (PTV) | |
|---|---|---|
| U.S. tile standard | Yes | No |
| Device | Portable digital tribometer | Heavy swinging arm |
| Setup on site | Minutes | Leveling and calibration each spot |
| Operator influence | Low, automated drag | Higher, depends on technique |
| Data | Digital, stored and reportable | Manual reading |
The BOT-3000E: built for DCOF testing
Walkway Management Group manufactures the BOT-3000E, the digital tribometer used to measure DCOF to ANSI A326.3. It runs a controlled, automated drag of the test foot, records each result digitally, and fits in a carry case, so one technician can test a whole facility in a visit. That consistency is what makes results defensible when a slip claim or a specification is on the line.
Which test should you use?
- Specifying or approving tile in the U.S.: DCOF to ANSI A326.3.
- Checking an existing floor for safety or liability: DCOF gives you a number tied to the U.S. standard and a clean record over time.
- A project written to a UK or Australian spec: that spec may call for pendulum. Follow the document you are bound by.
Next step
Need a floor tested, or want your own team to test? WMG offers on-site slip resistance testing, BOT-3000E sales and rental, and the BOT-3000E certification course. Contact us and we will tell you which option fits.
