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Tag Archives: coefficient of friction

A Review of Standards for Pedestrian Slip Resistance Testing

There are a number of floor slip test methods established by standards-setting organizations that assess pedestrian slip resistance. Here we’ll review the most widely known and current ones. They are distinguished by the devices used in the testing. Terms such as DCOF rating, coefficient of friction, slip coefficient, slip resistance rating, and friction coefficient all […]

New Study Shows Sotter Engineering to be one of World’s Most Accurate Pendulum Floor Slip Test Labs

A recent global interlaboratory program “Slip Resistance Proficiency Testing — Pendulum Friction Tester,” showed Sotter Engineering Corporation’s Safety Direct America (SDA) floor slip resistance testing laboratory to be one of the world’s most accurate in use of the pendulum skid tester. The pendulum is a national standard for pedestrian floor and tile slip resistance testing […]

Financial losses from slip and fall accidents

Slip and fall accidents are the #1 reason Americans show up at emergency rooms, according to data from the CDC. Slippery floors are a silent epidemic in America, and lawsuits are filed daily across the nation involving major injuries and deaths from slippery floors. Unless the negligent party is the victim’s employer, the victim of […]

Floor Slip Rating: SCOF vs. DCOF

Static coefficient of friction (SCOF) was formerly used to measure the slip resistance of a wet floor in the USA, but the test method (ASTM C1028) was withdrawn by the ASTM in 2014. Experts in the USA now know to use dynamic coefficient of friction (DCOF), as the rest of the world has been using […]

A Caveat about Dal-Tile’s Situation-Specific Minimum DCOF AcuTest Values

This blog has previously praised Dal-Tile for recognizing that “one size fits all” does not work when it comes to slip resistance standards (or bikinis, for that matter). For instance, Dal-Tile has recommended a minimum ANSI A137.1 DCOF AcuTest wet dynamic coefficient of friction of 0.60 for swimming pool decks, public showers, and locker rooms. […]

No More Slips in Supermarkets!

Today, over 99 percent of supermarket floor areas are slippery when wet or otherwise lubricated. The lubricants may be water from tracked-in rain and snow; vegetable display sprays or a dripping ice bag; WD-40 from a customer’s test of a spray can; cooking oil; milk; or a very large variety of other liquids and solids. […]

Cofficient of Friction and Probability of Slip

Analysis published many years ago by Pye of Britain’s Building Research Establishment quotes the probability of a slip (not a fall or injury) as varying with the coefficient of friction (COF) between the shoe and floor as follows: COF  Risk, 1 in … 0.40  1,000,000 0.38     100,000 0.34       10,000 0.31 […]

Article published in The Construction Specifier magazine talks slip resistance

John C. Sotter and George Sotter of Safety Direct America were published in the July issue of The Construction Specifier magazine with an article talking about floor slip resistance and keeping floors safe for pedestrians. The article talks about the latest International Building Code (IBC) requirements for slip resistance, and its limitations as far as […]

Video Explains IBC Requirements for Floor Slip Resistance

The 2012 International Building Code changed slip resistance requirements for indoor floors that may get wet in use. The previously-used ASTM C 1028 friction test method is obsolete, and testing using the AcuTest method in ANSI A137.1 slip test must show a minimum of 0.42 wet dynamic coefficient of friction — but many other factors […]

OSHA’s “Suggestion” for Minimum Floor Coefficient of Friction (COF)

We often hear the question, “What does OSHA require for floor slip resistance?” The answer is that OSHA doesn’t require anything, but nevertheless has caused a lot of confusion for employers and the public on this subject. There has never been an official OSHA slip test or safety standard for flooring. In a nonmandatory appendix […]