Blog/What is Dynamic Coefficient of Friction? Five things you need to know.
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What is Dynamic Coefficient of Friction? Five things you need to know.

Dynamic Coefficient of Friction (DCOF) is the new industry standard for measuring a surface’s slip resistance and is quickly replacing Static Coefficient of Friction (COF) tests. Here’s what you need to know about the new testing:

  • DCOF measures slip resistance during motion while COF measure slip resistance to put an object in motion. This means the new standard more accurately measures a surface’s slip resistance when walking.
  • The Dynamic Coefficient of Friction testing standard is always conducted with a wet, slightly soapy solution of .05% Sodium Laurel Sulfate and Water. That is why there is only one score, and not a wet and dry score which was the old standard.
  • Unlike COF testing, the new DCOF test is more accurate and can be conducted in the field with a portable machine called the BOT3000.
  • The DCOF standard for porcelain ceramic tile is 0.42.
  • DCOF values of a surface will change over time. Understanding a material’s abrasion resistance and overall strength will help predict the durability of the finish.

Mosa surpasses industry standards by producing standard Ultragres tiles with a 0.76 Dynamic Coefficient of Friction.

While the new DCOF testing is a big improvement on the previous testing methods, it is not enough. Environmental conditions must be taken into account as some areas exposed to heavy foot traffic, water, food service, or located on street level will require slip resistances higher than the 0.42 standard. Combining the new test with a sound understanding of the requirements of the space will guarantee the right tile is used for the right space.