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What is the Coefficient of Friction?


What is Coefficient of friction in the Concrete Polishing industry? Coefficient of friction (COF), tests the slip resistance to accidents on different types of industrial, commercial and residential floor surfaces. Slip resistance is good for building owners, business owners and residential owners to prevent slips and falls on different polished surfaces. When flooring is properly installed and cleaned, the concrete floor will result in a safe surface for traffic on both wet and dry conditions.

The two types of coefficient of friction are known as static and dynamic. When measuring friction from a resting position, it is called static coefficient of friction (SCOF). And the measurement of relative motion is called dynamic coefficient of friction (DCOF). The measurements will discover the propensity for accidents on flooring in wet and dry conditions. But the most important is to test the flooring when in wet conditions with water or a lubricant because majority of slips and falls are on wet flooring.

Pendulum testers, tribometers and variable-angle ramps are some of test methods to test static and dynamic coefficient of friction. But COF testing is difficult, especially testing the dynamic (DCOF), so to receive accurate results the testing needs to be done in a rigorous laboratory environment.

The American Society for Testing and Materials (ASTM) defines the pendulum tester the national standard for the slip resistance testing machines when testing dynamic and static coefficient of friction. The pendulum tester is also used the most worldwide as the pedestrian slip resistance test method.  The way this testing device works is it uses a piece of rubber to travel across the flooring for 124-126 mm while mounted onto a pendulum device.

The BOT-3000E digital tribometer, also know as the “drag-sled meter,” is becoming a popular slip resistance tester for dynamic and static coefficient of friction. This test meter is also backed by ASTM. The tester crawls at a slow pace along the floor surface dragging a piece of rubber to measure the slip resistance while documenting the values for SCOF and DCOF.

The American National Standards Institute (ANSI) set the ranges to static and dynamic values.

The higher the value of friction the less slippery the surface will be in an industrial, commercial or residential building. But when the measurements report too high then the surface can be too difficult to walk on. And the low friction measurements present a high risk for accidents on the flooring surface. Standard setting for ANSI  is >0.42  for dynamic friction and >.60 for static friction polished surfaces to prevent slips and falls.
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Location: Pompano Beach, FL 33069, USA

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