Coefficient of Friction Tester
Saicheng coefficient of friction (COF) tester is specialized in measuring the static and kinetic coefficients of friction of plastic film and sheet, rubber, paper, cardboard, woven bag, fabric style, metal material composite belt for communication cable and optical cable, conveyor belt, wood, coating, brake pad, wiper, shoe material, tire and other materials when sliding.
Coefficient of Friction Test Standards
ISO 8295: Plastics -- Film and sheeting -- Determination of the coefficients of friction
ASTM D1894: Standard Test Method for Static and Kinetic Coefficients of Friction of Plastic Film and Sheeting
TAPPI T816: Coefficient of Static Friction of Corrugated and Solid Fiberboard (Horizontal Plane Method)
- AbdelrhmanZaky from EgyptPosted on Jul 22, 2021I received my COF tester in a timely matter. The machine was well packaged. Great value for the price. I’d recommend this tester table to others.
What is Coefficient of Friction Tester ?
The coefficient of friction (COF) tester is designed to measure the static and kinetic coefficients of friction of plastic film, sheeting and similar materials.
What is Coefficient of Friction?
Coefficient of friction, the ratio of the frictional force resisting the motion of two surfaces in contact to the normal force pressing the two surfaces together.
Coefficient of Friction Measurement
Coefficient of friction (COF) is a dimensionless number that is defined as the ratio between friction force and normal force. Materials with COF smaller than 0.1 are considered lubricous materials. COF depends on the nature of the materials and surface roughness.
The formula for the coefficient of friction is μ = Ff / FN, where μ is the coefficient, Ff is the friction force, and FN is the normal force.
Materials with COF smaller than 0.1 are considered lubricous materials. COF depends on the nature of the materials and surface roughness. Usually, ASTM D1894 is the most widely used method for COF measurement.
Static vs Kinetic Friction
Typically friction can be distinguished into static friction and kinetic friction. Static friction force Ffs is the friction force prior the initiation of motion. Kinetic friction (also known as dynamic, or sliding) force Ffk is the friction force developed during the motion. It should be noted that these forces are different with a following relation holding in most situations:
Ffk ≤ Ffs
Correspondingly, there are two friction coefficients, static μs and kinetic friction μk coefficients.
Static friction coefficient is calculated according to the following equation:
μs = Ffs / FN
Kinetic friction coefficient is calculated according to following equation:
μk = Ffk / FN