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Posted by Carly McGee - January 13, Testing the Slip Resistance Properties of Flooring Measuring slip resistance of walking surfaces involves identifying applicable regulations; the appropriate test device and test method; surfaces to be tested flat surfaces, ramps and stairs, areas of surface wear, contamination, and irregular flooring surfaces ; and applicable types of footwear or lack thereof. With so many variables, the process quickly becomes complicated.
This article discusses only a few of the elections associated with each of these variables and organizations that provide direction to the flooring industry. To begin, it is important to know which property are we truly measuring. Each affects human locomotion safety very differently. The one constant across principals and industries is that coefficient of friction COF is measured on a scale of 0 to 1, with 0 indicating no friction.
The ADA applies to places of public accommodation, commercial facilities, and State and local government facilities.
Non-mandatory Appendix A Section 4. A research project sponsored by the Architectural and Transportation Barriers Compliance Board Access Board conducted tests with persons with disabilities and concluded that a higher coefficient of friction was needed by such persons.
A SCOF of 0. The standards require ground and floor surfaces to be slip resistant, but they do not specify a minimum value. Per A ANSI A The standard specifies a threshold of safety of 0. ASTM D goes one step further to establish a compliance criterion to meet the requirement for a nonhazardous polished walkway surface. The value of data generated by this method is questionable because the SCOF is not applicable to someone walking across a polished surface. Because instruments utilize different sensors, geometries, and speeds of travel, correlations are impossible.
There is some debate about the accuracy of this device when testing wet surfaces. This instrument is portable and measures DCOF under wet and dry conditions. The instrument offers an operator training and certification program.
It has been argued that unreliable results are obtained under wet conditions. The German Ramp Test involves applying oil to a metal ramp and is conducted by a human walking on the surface. It utilizes a set of standard tiles available for purchase. When work is to be supervised by a qualified person, the qualified person shall have the necessary authority to carry out the assigned work responsibilities. About Carly McGee.
Testing the Slip Resistance Properties of Flooring
Static friction and Dynamic or Kinetic friction are the two types of coefficient of friction that are used to determine how safe a floor can be. Static Coefficient Friction is between non-moving surfaces; it can prevent an object or person from sliding down a gradient surface. Kinetic friction is between moving surfaces; it measures the friction between two surfaces moving against each other such as a book being pushed across a table or a sled being dragged across the ground. Many machines have been created to measure coefficient of friction. Highly regarded agencies use the results from these machines and their tests to create recommendations and standards that other agencies follow.
Grokazahn Again, the James Machine is measuring static COF, which is the measure of how slippery a floor is when someone is standing still on it. Of course for other applications in which the friction under slippage is important, such as machine operation or manufacturing processes, the dynamic coefficient of friction is a vital parameter and may be the more important practical parameter. It was once cited by the Asgm. Because the HPS is 2d heavy, it makes it rather difficult to test in the field. Again, the reasons included poor precision, which made it impossible to present an acceptable and reasonable precision statement as required by ASTM. Although it is necessary for a tribometer to pass this test, it is not sufficient astmm validating a scientific slip test instrument. It involves the James Machine with a leather friction pad measuring static friction, and specifies that all testing must be performed dry.