SCOF vs. DCOF: The Epic Battle of Friction Measurement

SCOF vs. DCOF: Choosing the Right Slip Resistance Test

Two acronyms come up constantly in floor safety: SCOF and DCOF. At Walkway Management, we believe it’s time to set the record straight and explain which method really protects people (and property) from slip-and-fall incidents.

SCOF: The Static Relic

Static Coefficient of Friction (SCOF) is the original metric for measuring slip resistance. It calculates how much horizontal force is needed to move a stationary object. That may sound useful, but here’s the problem: people don’t slip while standing still.

Historically, a SCOF value of 0.5 was considered safe, but that was based on outdated assumptions. In reality, most falls happen while someone is in motion—not frozen in place.

DCOF: The Real-World Solution

Dynamic Coefficient of Friction (DCOF) is a much more practical measurement. It measures friction while the surface is in motion, the condition that matters most on wet or contaminated floors.

Here’s the key: DCOF documents ANSI A326.3 compliance and monitors how a surface holds up over time—it isn’t a predictor of real-world slip risk. For that, the Pendulum Slip Tester (PTV) is the reference method.

Why the Pendulum Slip Tester (ASTM E303) Is the Best Way to Measure Wet Slip Resistance

While DCOF can be measured using devices like the BOT-3000E, the Pendulum Slip Tester—defined under ASTM E303—remains the gold standard for assessing slip resistance in real-world conditions.

• It simulates a heel strike, just like how slips actually occur.
• It works on wet, dry, inclined, or contaminated surfaces.
• It’s recognized globally and referenced in major building and pool safety codes.

At Walkway Management, we recommend using the Pendulum Test to establish baseline safety—especially for environments like pool decks, kitchens, lobbies, and ramps.

The BOT-3000E: Ideal for Monitoring Over Time

While the BOT-3000E is not the best choice for determining initial slip risk, it’s a valuable tool for tracking DCOF consistency after a floor is installed.

Use it to:

• Monitor surface changes caused by wear and tear, cleaning methods, or product buildup.
• Maintain compliance with standards like ANSI A326.3.
• Document changes and flag problem areas before accidents happen.

Think of the BOT as your maintenance tool, and the Pendulum as your risk assessment tool.

The Right Tool for the Right Purpose

Use the Pendulum Slip Tester to measure a floor’s wet slip potential under realistic conditions.

• Use the BOT-3000E to check how that floor is holding up over time.
• Together, they provide a comprehensive view of slip risk—before and after installation.

Final Word: DCOF Over SCOF, Always

SCOF is outdated, and using it to declare a floor “safe” can lead to misleading conclusions—and accidents. The pendulum’s reading, the Pendulum Test Value (PTV), reflects how people actually slip, and it gives the most accurate, legally defensible wet results.

Ready to Reduce Your Slip Risk?

Contact Walkway Management to schedule your DCOF testing. We use both the Pendulum Test and BOT-3000E, so you get the full picture: initial safety and long-term performance.

Let’s make your floors safer—smartly and scientifically.

Get a free quote or call 1-833-DIAL-WMG to have your floors tested.