Rubber is an important component in most of the industries. It is used in production, in safety gears, in domestic use, educational purpose, automotive, small components in machines, aerospace, etc. It has end applications, and so as its properties. Rubber is chosen for the application after testing its properties. The presence of ash in crucial aspect, that contribute in altering the properties of the natural rubber. While procuring the raw material, manufacturers have predefined properties they are seeking. For instance, tensile strength, ash percentage, flexibility and so on. Depending upon the application, the various properties are checked. In this post, we will shed some highlight on the popularly performed test. Rubber testing instruments are widely used in different industries as manually performed test are less accurate.

 

Testing of Ash Content

Ash is deliberately added into rubber to alter the properties of natural rubber or synthetic rubber. But the percentage is predefined with some tolerance more than that or less than that may result in the volatile behaviour of the rubber in real working conditions. This is why, before incorporating into the work flow, the samples are tested. Muffle furnace is used to determine the ash percentage in the sample. The sample is burnt down completely. The organic compound changes into fumes and ash left behind. The sample is weighed before and after the test. The difference in weight is a percentage of ash.

Testing of Tensile Strength

The resistance of rubber against the outward pull is defined as tension bearing strength. The tensile strength of rubber changed with the rise in temperature. At very low temperature, it becomes stiffer and prone to cracks when bent. On the other hand, with the rise in temperature, it becomes more flexible and resists cracks. Thus, to assess the real working behaviour, the sample is tested after hot and cold treatment. This brings a considerable change in the tensile properties of the rubber.

Testing of Abrasion

Abrasion is defined as the loss of some amount of rubber due to excessive friction. The abrading property change with the application. Rubber sample used as shoe sole will show more abrasion than the same sample used as O-Ring. As shoes sole will face more friction, it has to have more endurance. The abrasion of the sample is tested by rubbing it against the abrasive paper for a specific number of rotations. The sample is weighed before and after the test. Any difference in weight is considered as the loss of rubber as per the number of rotations.

Labtiger offers a wide range of rubber testing instruments. For more information about best machine for your industry, contact our experts.