Rubber Compounds Properties

The rubber properties chart below provides general information for various common elastomeric compounds and very general features of the most common elastomers.

Rubber compounds properties. Natural rubber is characteristically widely variable in viscosity from lot to lot so that several lots are usually blended and masticated to control viscosity and physical properties of the compound. It is also able to remain flexible over a wide temperature range. Generally the many different grades of neoprene have a direct correlation to the actual percentage of neoprene in the compounds. Sbr features excellent resistance to brake fluids and good water resistance.

A number of ingredients are added to both natural and synthetic rubber in order to obtain certain desirable properties. Rubber rubber additives. Rubber compounding is a broad field. The rubber materials selected by designers and technical buyers should meet all their application requirements.

Sbrs primary custom molded application is the use in hydraulic brakes system seals and diaphragms with the major of the industry usage coming from the tire industry. Different carbon black structures were used and characterised with respect to their rheological and physical properties it was found that the nr compound containing high structure black i e. Sbr compounds have properties similar to those of natural rubber. A typical rubber formation based on parts per hundred is.

Basic elastomers are mixed with a variety of chemicals and ingredients to obtain desired physical properties. The inherent physical characteristics of elastomers can be modified through compounding. Polymer 100 phr filler 30 60 phr. This could not be further from the truth.

Rubber compounds that crg supplies are capable of servicing a diverse range of temperatures from 73 c to 650 c and many are available in a wide range of durometers 40 80 shore a and thicknesses 1 32. Rubber compound formulations have generally evolved over many years with new additives and fillers combined with old. By convention mix formulations begin with the amount of the designated elastomer for instance natural rubber nr butadiene rubber br or styrene butadiene rubber sbr given as 100 parts by weight. Sometimes there is a misconception that a rubber compound is one ingredient and is the same for every different polymer type.

However the knowledge of rubber s physical properties and their measurement is critical for compound selection. As noted above rubber compounds exhibit a wide range of properties resulting from differences in each material s formulation. A typical rubber formulation may have two or three different types of rubber adding up to 100 parts and then curatives fillers process stabilizers accelerators antiozonants antioxidants lubricants processing aids acid and base neutralizers and colorants to name a few. This study aims to investigate the effect of carbon black structures on the mechanical properties of industrial tyre rubber compounds containing natural rubber nr and styrene butadiene rubber sbr.