Static Coefficient of Friction (SCOF) Test

The Cause and Physics of Slip and Falls on A Wet Floor

A slip occurs when water is trapped between the sole of a shoe and floor. No matter what the sole design or material and type of flooring present this physical occurrence is known as hydroplaning.

According to the U.S. Department of Energy a slip and fall study was conducted of workers within their facilities. The findings of this study showed that three-fourths of the indoor injuries reported involved water.

The measurement of Static Coefficient of Friction (SCOF) is the value used when measuring for friction between the sole of a shoe and floor.

The SCOF value for no friction is 0.0. The value of a wet tile floor is 0.2 and the closer the value is towards 0.0 the slipperier the surface.

Test Method for Measuring Wet SCOF of Common Hard-Surface Floors

Measurement Device: Binary Output Tribometer

Model: BOT-3000

Company conducting test: South East Environmental

Floor Surface: 12”x12” industrial grade tile with ¼” grout.

Area: 6ft.x10ft. (60 square feet)

Ambient Temperature: 76 degrees F

Air Flow: 82 CF/minute

Cleaning Agent: Envirox Concentrate 118

Concentration: 1oz per gallon

Number of tests: 9

SCOF Values: Average of 9 tests for each mopping system

String MopPre-soaked Flat MopSPILL MASTER 
Evaporation time & SCOF Value:.5 min = .20.5 min = .200.5 min = .60
1 min = .221 min = .24
5 min = .335 min = .39
10 min = .4910 min = .54
11.8 min = .609.1 min = .60

The acceptable SCOF value established by the American Standards Association is 0.6 for a wet floor which may significantly reduce the possibility of a slip and fall injury.

Summary of Test Values: The string mop achieved 0.60 in 11.8 minutes, the pre-soaked mop achieved 0.60 in 9.1 minutes, and the SPILL MASTER achieved .60 in 30 seconds.