We’ve all heard the old adage, “Fool me once, shame on you; fool me twice, shame on me.” The Tile Council of North America (TCNA), who reportedly is “in partnership” with at least one of America’s largest tile manufacturers, spent almost two decades promoting the misinformation that the ASTM C1028 static coefficient of friction (SCOF) […]
Tag Archives: SCOF
BOT-3000E Manufacturer Advises Against Using ANSI/NFSI B101.3 and B101.1 to Assess Floor Slip Resistance
The manufacturer of the BOT-3000E digital tribometer is Regan Scientific Instruments of Carrollton (Dallas), Texas. Recently we asked Regan for an update on ANSI B101.3, “Test Method for Measuring Wet DCOF of Common Hard-Surface Floor Materials,” approved January 18, 2012, and ANSI/NFSI B101.1. We received a reply from Peter Ermish, President. Here’s part of his […]
U.S. Senate Bipartisan Report: Falls Kill an American Senior Every 19 minutes
Lest we think that the U.S. Senate is capable only of partisan wrangling, the bipartisan Senate Aging Committee has published a report on falls prevention in efforts to protect those 65 and over from injury and premature death. Every 11 seconds an older American is treated in an emergency room for a fall. Every 19 […]
Maximum Coefficient of Friction is not Limited to 1.00
It’s sometimes assumed that coefficient of friction (COF) has a maximum theoretical and practical value of 1.00. This isn’t true; there is no maximum. It is true that values exceeding 1.00 are so slip-resistant that their actual value is often of little interest. Some COF measuring instruments, such as BOT-3000E and English XL, are not […]
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(SCOF) was formerly used to measure the slip resistance of a wet floor in the USA, but the test method (ASTM C1028) was withdrawn by the ASTM in 2014.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 […]
ANSI Issuing Another Standard Slip Test Method for Flooring Materials
The American National Standards Institute (ANSI) is issuing a new test method, with minimum dynamic coefficient of friction (DCOF rating), for slip resistance of hard flooring materials, wet or dry, laboratory or field testing. No minimum DCOF is provided for exterior applications. The BOT-3000E digital tribometer is used for the testing. The Secretariat for the […]
COF vs. Pendulum Test Value (PTV to DCOF conversion table)
Pendulum slip (or skid) resistance data are usually expressed as PTV, Pendulum Test Value (or sometimes BPN, British Pendulum Number, or even SRV, Slip Resistance Value). The question has been asked, “What’s the coefficient of friction?” This number (dynamic COF – DCOF) was calculated decades ago at the U.S. National Bureau of Standards, and can […]
Proposed Federal Rule for Floor Slip Resistance
The U.S. federal government’s Consumer Product Safety Commission (CPSC) is considering a petition requesting rule making to require that manufacturers of floor coverings, floor coverings with coatings, and treated floor coverings label their products’ slip resistance in accordance with an ANSI/National Floor Safety Institute (NFSI) standard, B101.5. (NFSI, Safety Direct America and others offer for-fee […]
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 […]
What’s the Difference Between the Three ANSI standards for floor slip resistance?
The American National Standards Institute (ANSI) has three pedestrian floor friction standards involving tests using the BOT-3000E digital tribometer, intended for testing flooring for indoor use. Why do they have three standards, and what’s the difference between them? They all have different test methods and different minimum coefficient of friction values (0.42, 0.43, and 0.60). […]