The inherent physical characteristics of elastomers can be modified through compounding. THE PROPERTIES OF MATERIALS and their everyday uses Children need to have experience of, and explore as many different materials (substances) as possible in order to make sense of their world. While polyisoprene can also be made synthetically, producing what is known as “synthetic natural rubber.” Their properties while similar to those of rubber, are capable of wider variation. NR – Natural Rubber IR – Polyisoprene Properties. Rubber Material Selection Guide NR or Natural Rubber Polyisoprene ASTM D-2000 Classification AA Chemical Definition Polyisoprene Compound Number Category 10000 Series ♦ Physical & Mechanical Properties Durometer or Hardness Range 30 – 95 Shore A Tensile Strength Range 500 – 3,500 PSI Elongation (Range %) 300 % – 900 % Typically, a small percentage of other materials – including proteins, fatty acids, resins, and inorganic materials – are found in natural rubber. In addition, it has the highest ductility and the lowest thermal conductivity. An elastomer is a substance which can undergo much more elastic deformation under stress than most materials and still retain its previous size without any deformation. MECHANICAL PROPERTIES AND DURABILITY OF NATURAL RUBBER COMPOUNDS AND COMPOSITES Joseph Thomas South (ABSTRACT) The focus of this research was to investigate the effect of thermal degradation upon the mechanical properties of natural rubber compounds and apply those effects to the life prediction of off axis 2-ply cord rubber laminates. However, the knowledge of rubber’s physical properties and their measurement is critical for compound selection. It has a fairly low density among rubber materials. Synthetic rubber is produced artificially from polymers in different varieties to mimic the different properties of natural rubber. The processing of synthetic rubbers involves approximately the same steps and equipments as that of crude rubber. Styrene Butadiene Rubber (SBR) is one of the cheaper general purpose rubbers. Raw rubber when heated to 130°C becomes soft and plastic. Typically, a small percentage of other materials – including proteins, fatty acids, resins, and inorganic materials – are found in natural rubber. Material Reference. The rubber materials selected by designers and technical buyers should meet all their application requirements. Rubber compounding is a very broad and technical field, since basic rubbers or elastomers are mixed with various chemicals and ingredients (and even with each other) to obtain desired physical properties. NR, or Natural Rubber sometimes called “india rubber” is a visco-elastic material consisting of a natural organic compound called polyisopreme as well as, others organic compounds including water. Natural rubber usually withstands polar organic solvents (alcohols, ketones, aldehydes), organic acids, and … There are two types of rubber — Natural Rubber and Synthetic Rubber. It is a natural occurring elastomer extracted from the sap of the Hevea Brasiliensis tree grown on plantations. They are rubber like materials which have many of the characteristic properties of rubber and some of which resemble rubber in their chemical nature. For assistance in identifying the appropriate polymer or material, or to develop and formulate a NR or natural rubber compound to meet your specific application and performance requirements, please contact Rahco Rubber, Inc. at [email protected] or 847-298-4200. Rubber, which can either be synthetically produced or derived from the milky colloidal suspension found in the sap of some plants, exhibits unique properties that render it extensively useful in many applications and products. Chemistry, Manufacture and Applications of Natural Rubber is a comprehensive resource for academics, chemists, chemical engineers, mechanical engineers, and other professionals in the rubber industry, as well as those industries, including automotive, civil, and medical engineering, using natural rubber products. The advantages of natural rubber are less buildup of heat from flexing and greater resistance to tearing when hot. In general, synthetic rubber has the following advantages over natural rubber: better aging and weathering, more resistance to oil, solvents, oxygen, ozone, and certain chemicals, and resilience over a wider temperature range. The graph bars on the material properties cards below compare IR rubber to other rubber materials … 3. Natural rubber properties. Keywords: rubber mixtures, latex, hybrid parts, strength properties 1 INTRODUCTION: CHARACTERIZING THE MIXTURES EXAMINED The natural rubber is the most often used type of mixture of the rubber industry nowadays which is produced from the milk-like fluid (from latex) of certain tropical trees.

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