COF Testing for the Resistance of Materials

 The coefficient of Friction of a material would be the measure of the sliding resistance of a material more than a different material. In the case of thermoplastics the mating component is normally steel. When multiplying the co-efficient of friction by the perpendicular force amongst the two mating sliding faces, this result is definitely the force essential to slide the components across each other.

What Does ‘Coefficient of Friction’ Imply?

Coefficient of friction is really a measure on the level of friction existing in between two surfaces. If you obtain a coefficient of friction, you’re calculating the resistance to motion in the interface of two surfaces of similar or dissimilar materials.

The energy of this friction force depends upon the materials which are pressing against one particular yet another. As an example, a steel bar will slide much more simply on a sheet of ice than on a slab of concrete. In these examples, the steel-on-ice mixture has a considerably decrease coefficient of friction.

The coefficient of friction is a vital property of all materials which run on higher speed manufacturing lines; specifically these in the printing and packaging industry. Coefficient of friction is routinely specified for plastic flow-rapping films.

Why does it matter?

Basically, the coefficient of friction will differ amongst mobile and immobile objects. For probably the most element, objects that aren’t moving usually experience more friction. This can be because it requires far more energy to push them into motion than to maintain them moving.

How Do Friction Coefficient Values Operate?

Coefficient values would be the numbers that express how materials interact. These values normally run from 0-1, but they also can be larger than one particular if the components are in particular sticky.

Basically, if objects possess a coefficient value of zero, there’s no friction. This is not common, nevertheless it is achievable with components which have superfluidity. If materials possess a coefficient worth of 1, it implies the friction force is definitely the same because the normal force. In other words, the force expected to move the object is equal to that object's weight.

Objects also can have a friction worth greater than one. As an example, rubber is often a frequent material which will have a particularly high coefficient of friction. As a common rule, most supplies that are not wet are inclined to fall in the 0.3-0.six range.

Plastics Coefficient of Friction COFTesting

Measuring friction might be crucial aspect for a lot of industries, specifically for plastics and packaging. Friction is usually characterized by static friction, and kinetic friction. Static friction of plastic is present when two objects are in contact but not sliding across each other. Kinetic friction is often a resistance friction that is present during sliding motion involving two objects. The coefficient of friction is dependent on the surface situations of both materials which can be in speak to.

COF testing standards like ASTM D1894 and ISO 8295 cover the testing methods to decide the coefficient of plastic supplies. COF testing requires pulling a weight using a plastic specimen among the weight as well as the ground. The force required to accomplish so is usually measured and also a coefficient of friction is then determined.