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The evaporative loss of coalescent further accelerates film hardening. The dried polish film is now ready to take on the ravages of pedestrian traffic. Brian T. Cartwright I The Interaction and Performance of Commercial and Experimental Fluorosurfactants and Commercial Floor Polish i Reference: Cartwright, B. , "The Interaction and Performance of Commercial and Experimental Fiuorosurfactants and Commercial Floor Polish," Technology of Floor Maintenance and Current Trends, ASTM STP 1448, W. J. , ASTM International, West Conshohocken, PA, 2004.

HUGHES ON COEFFICIENT OF FRICTION--AN OVERVIEW 55 force. Because there is now less force holding the interface together, less horizontal force will be required to cause the surfaces to slip. (More on this topic is discussed later). Is the Floor Too Slippery? Is the floor too slippery? One way to find out is to wait for people to fall; the better method is to test the coefficient of friction of the floor finish [2]. Those words, written by Stuart Gurney, Laboratory Director, Loss Prevention Department of Liberty Mutual Insurance Company, were published in National Safety News, October of 1940.

The frictional force exerted at the walking interface to oppose the horizontal forces of walking is a property of the two surfaces, which meet at the walking interface. It is a function of the chemical compositions and physical structures (particularly roughness and planarity) of both of the surfaces that make the interface. Since a polish-eoated floor is very often one of these surfaces, the frictional properties of polish films have been of great importance to the floor polish industry. There are a number of universally accepted, pertinent facts about friction as it relates to human locomotion.

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