COF
Polypedia > Properties of polymers > Physical properties
Coefficient of friction | |
The COH is the value that describes the relationship of the force of friction between two bodies and the force that presses them together. They range from near zero to more than one, depending on the types of materials used. In summary, the rougher surfaces tend to have higher effective values, while the smoother surfaces have smaller ones due to the friction they generate when pressed together. | |
Calculation | |
The coefficient of friction (COF) is usually expressed with the Greek letter "micro" μ. The weight of the sample "W" is placed on the sliding plate while "F" represents the force necessary to move the sample expressed in grams "gr" ASTM D 1894 - B / DIN 53375 |