Polymeric rubber is the term used for a range of elastomers made from polymerised monomers (polymers are groups of linked molecules) and that have a degree of elasticity. The elasticity is what distinguishes it from plastics which are rigid and do not stretch. In addition, rubbers have good resistance to a wide range of chemicals and oils and are excellent electrical insulators.
Natural rubber is extracted from the latex vessels (ducts) or cells of various species of the Hevea brasiliensis plant. It is a milky liquid at room temperature and is processed into the solid form commonly seen today. It is then combined with other materials to produce a wide range of products. This link https://www.muga.co.uk/
Rubber has high tensile strength and elongation and can be stretched many times without tearing. This makes it useful in items such as hoses, rollers for domestic clothes wringers and specialised machinery mountings to reduce vibration. It also has good abrasion and impact resistance, and is water resistant and gas tight.
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The majority of rubbers in use are synthetic, with only 10% or so being derived from natural sources. Modern rubbers are essentially highly engineered composites consisting of a number of different natural and synthetic components that are bonded together through the process of vulcanisation. Most common is a blend of natural rubbers, such as polyisoprene and cis-polybutadiene, with synthetic polymers such as acrylonitrile butadiene styrene, poly(butadiene), and other polymers based on petroleum oil like styrene and butadiene. The blend is then mixed with fillers and modifiers such as silica, carbon black, factice and whiting to give it specific properties for its intended application.