New Requirements, New Method and New Threshold for Coefficient of Friction (COF) on tile.
A significant use of ceramic tile and stone involves wet areas requiring long term control of intermittent and/or constant presence of moisture.North America is switching from Static COF (SCOF) with ASTM C1028 method to Dynamic Coefficient of Friction COF (DCOF) with the BOT 3000 to the new recognized and accepted standards ANSI A137.1.Importantly, because of the withdrawal of CGSB M75.1-88 is that testing for the COF (Coefficient of Friction) under ASTM C1028 for slip resistance is no longer recognized, and is being replaced by the Dynamic Coefficient of Friction (DCOF) test referenced in ANSI A137.1-2012 (Section 6.2) that uses a factory calibrated and validated, portable testing apparatus called the BOT-3000 Digital Tribometer, a self-propelled device that uses various sensor materials. The BOT 3000 is a portable machine which means that it could be used in a laboratory or in the field for testing Dynamic Coefficient of Friction (DCOF).
Why the switch to DCOF AcuTest? (Sometime called kinetic coefficient of friction)
This is the ratio of force necessary to keep a surface already in motion sliding over another divided by the weight (or normal force) of an object. This force is a materials property of two surfaces.
Dynamic testing is done in many other countries. Generally more repeatable predictor of slip resistance DCOF is a more suitable test of polished and highly smooth surfaces DCOF measures COF when sensor is already in motion, which better simulates human
ambulation at the time of a slip.
TTMAC now offers this testing service in our Concord Ontario office and laboratory.
Testing is conducted with the BOT 3000E and is called the DCOF AcuTest. The BOT 3000 is a type of Tribometer which measures the parameters such as frictional forces, coefficient of friction and the effects of lubrication. ANSI A137.1- 2012 has established that a Wet DCOF of .42 or greater for level interior spaces and if a ramp the requirement is greater than .42
Standard Testing conducted will be Wet Dynamic Coefficient of Friction. Also available, for an additional fee a Dry Dynamic Coefficient of Friction can be conducted. This is not required by ANSI A 137.1- 2012 but could be helpful for comparison purposes when the tile is used in wet versus dry applications.
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