The raw material to make natural rubber comes from trees. However, the knowledge of rubbers physical properties and their measurement is critical for compound selection. Natural rubber is the product of the sap of the hevea tree. As the name would indicate, this elastomer occurs naturally and comes from the latex of certain trees and plants. Our rubber properties chart provides a guide for making initial decisions about the suitability of an elastomer for a given application or service environment, our technicians are available to help you make informed decisions most of the main rubbers are included in the properties chart below although white cross rubber products ltds capability also extends to a. Natural rubber and synthetic rubber preparation and properties. Nbr is actually a complex family of unsaturated copolymers of acrylonitrile and butadiene. Blending in latex form of natural rubber and nitrile. Vulcanization part 3 of a 3part series contributed by michael cremeens. The rubber properties chart below provides general information for various common elastomeric compounds and very general features of the most common elastomers. In this study the influence of fullerenes in concentrations from 0. The physical properties of rubber linkedin slideshare. It has excellent tensile, elongation, tear resistance and resilience. Several studies have been carried out to reuse scraptires in a variety of rubber and plastic products, incineration for production of electricity.
Mechanical properties of natural rubber nanocomposites. A tough material for physically demanding applications. Rubber grade carbon blacks are characterized by four basic properties. Common name neoprene natural polyisoprene butyl chlorinated butyl buna n sbr hypalon vamac ethylene propylene rubber polyethylene teflon crosslinked polyethylene modified crosslinked polyethylene composition. Acrylonitrilebutadiene rubber nbr properties and applications nitrile rubber nbr is commonly considered the workhorse of the industrial and automotive rubber products industries. A wide variety of nitrile rubber properties options are available to you, there are 111 suppliers who sells nitrile rubber properties on. Sulphur acts as a crosslinking agent and after vulcanization, rubber gets crosslinked and becomes hard. Rubber is quite stretchy, as indicated by the nature of rubber bands. Pages in category rubber properties the following 32 pages are in.
The most common properties of rubber are its elasticity, resistance to water and its use as an electrical insulator. Rubber properties in compression1 this standard is issued under the. Carbon black is one of the major fillers used in rubber production as. Martins rubber explain the advantages of natural rubber.
The rubber is collected from the latex in a series of steps involving preservation, concentration, coagulation, dewatering, drying, cleaning, and blending. Natural rubber combines high strength tensile and tear with outstanding resistance to fatigue. Properties of natural rubberbased composites containing. Rubber properties table white cross rubber products. Rubber guide to properties material abbreviation propertiesapplications natural nr natural rubber offers a good balance of properties, particularly for mechanical applications and can be compounded to produce high resilience, good tensile strength, low compression set and high tear properties over a wide range of hardness. Crude natural rubber is found in the juices of many plants shrubs, vines, and trees, the principal of which is the hevea brasiliensis tree, native to brazil. We can change the formulation of the rubber so that the specifications meet your needs. The third stage of the curing or vulcanization process is a point at which all technological properties of the rubber compound are forming and is necessary to cure the rubber compound to its optimum state of cure. Natural rubber features low compression set, high tensile strength, resilience, abrasion and tear resistance, good friction characteristics, excellent bonding capabilities to metal substrate, and good vibration dampening. Butyls excellent impermeability to gas makes it very useful in seals for vacuum. Properties of rubber elastomer properties custom advanced. The structures of the pristine, purified, and modified attapulgite were characterized by ftir, tem, xrd, and bet. Natural rubber has certain unique properties such as follows.
In this article, martins rubber explain the advantages of natural rubber. Acrylonitrile butadiene rubber nbr, usually shortened to nitrile, is a unique elastomer. Testing of elastomers and plastics in support of analysis. Rubber material selection guide epdm or ethylene propylene. Mechanical and electrical properties of natural rubber and. Elastomers have a variety of properties such as hardness, tensile strength, and elongation. Rubbers ability to sustain large deformations with relatively little damage or permanent set makes it ideal for many applications. For example, if you need to find rubber compression properties, rubber weather resistance or even rubber ozone resistance for your orings, you can find the best combination of elastomer properties by using this oring material guide for your application. Basic elastomers are mixed with a variety of chemicals and ingredients to. Glossary of rubber words, terms and terminology commonly. Natural rubber is an elastomer with excellent properties, which have been exploited in a wide range of applications. These properties of carbon black effect on rubber properties.
Or better yet, use the rubber chart to find which material will best suit your environment. Natural rubber is a crop able to grow only in tropical climates and it doesnt age well, so for many countries it is easier to use synthetic rubber. Despite the fact that it is a welldefined engineering material, with comprehensive documentation on both mechanical data and design principles, many engineers remain ignorant of natural rubbers potential. In addition, it has the highest ductility and the lowest thermal conductivity. Natural rubber is a versatile material use in engineering for many years because it can take a beating and still perform crucial functions. It has a fairly low density among rubber materials. A study on effect of addition of natural rubber on the. After the latex is processed, natural rubber becomes an elastomer with excellent mechanical properties.
The effect of the filler dispersion in the elastomeric matrix has been also investigated. It can be produced by freeradical emulsion polymerization of butadiene with 15 to 45 percent acylonitrile either hot hot rubber or cold cold rubber. Rubber blending is commercially important because it gives a balance of properties which one rubber alone cannot provide. This nitrile 70 durometer 70a specifications chart will help you determine if these nitrile material properties will be compatible with your rubber or oring seal application. It has excellent green strength and tack which means that it has the ability to stick to itself and to other materials which makes it easier to fabricate. Properties, behavior and uses natural rubber nr is the most often used rubber in the industry. Engineering sciences mechanical properties of rubber an overview al. Standard test methods for rubber properties in compression.
Properties of nr epdm blends with or without methyl methac. The graph bars on the material properties cards below compare ir rubber to other rubber. Overall, the combined properties of natural rubber outweigh synthetic rubbers or combinations of synthetic rubbers available. Natural rubber combines high tensile and tear strength with an outstanding resistance to fatigue. Natural rubber nr natural rubber is a product coagulated from the latex of the rubber tree, hevea brasiliensis. Ethylene propylene diene monomer rubber epdm is an excellent rubber for outdoor use. Rubber and elastomers overview professional plastics. The results indicated that the structure of attapulgite changed. Rubber properties qfeatures excels in mechanical strength.
Nitrile rubber belongs to the family of unsaturated copolymers of acrylonitrile and butadiene. Technical data sheet 1069 page 2 of 2 33 york street, elora, ontario, canada. Rubber material selection guide nbr nitrile or buna n. Only some significant difference is observed at very low shear rate frequency on tangent tainstruments. A number in parentheses indicates the year of last reapproval. Rubber performance characteristics studied include cure properties and physical properties such as stressstrain, tear strength, cut growth resistance, abrasion resistance and heat buildup. Following is the list of nitrile rubber properties. It is extracted in the form of latex from the bark of the hevea tree. Avoid using in areas where it may be exposed to direct sunlight or around ozonegenerating electrical devices. Some applications demand the most out of their individual parts. The following range of properties shows just how versatile of a material natural rubber has proven to be to engineers. Properties of natural rubber natural rubber has been successfully used as an engineering material for many years. Epdm was blended with natural rubber with various blend ratios, after which the processing, cure characteristics, and mechanical properties of the nrepdm blends were determined. Nbr rubber,nitrile rubber properties,applications of nbr.
The inherent physical characteristics of elastomers can be modified through compounding. We measure structural properties usa elasticplastic models hyperelastic models stress straintimetemperature. To enhance all these properties, sulphur is added to the rubber and it is heated at a temperature ranging 373 k to 415 k. Excels in abrasion resistance and oil resistance, and economical.
The rubber materials selected by designers and technical buyers should meet all their application requirements. When raw rubber is heated, it becomes sticky, and when it is in colder temperatures, it tends to break, just like the synthetic variety. Ir rubber is a thermoset elastomer or rubber material. Once the rubber has been vulcanized or cured, physical properties are enhanced and the compound is more resistant to deterioration. Blend of natural rubber nr and nitrile rubber nbr imparts rubber with a balance in tensile strength and oil resistance,, while the other mechanical properties of the blend such as tear strength and abrasion resistance can be improved by the addition. 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 milklike fluid from latex of certain tropical trees.
Bulletin of the transilvania university of bra sov vol. Next time you jump in your car, spare a thought for how far your tyres have come even before. Nr is a polymer of cisisoprene units linked together at 14 positions. Rubber properties, rubber mechanical properties, oring. Viscoelasticityviscoelasticitythis is because an elastomer goes throughboth a viscous phase and an elastic phase. Nitrile rubber can generally be used down to about 30c but special grades of nbr can work at lower temperatures too. Natural rubber nr containing epdm may show improved weathering resistance. Natural rubber, natural rubber properties, natural rubber. However, synthetic rubber is advantageous because it is easier to produce.
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