Within the first year of production, output of synthetic rubber tripled to 30, tons, increasing to more than , tons by the end of the war. There is only one chemical type of natural rubber. The variety of physical properties found in different natural rubber products is produced entirely by different methods of plantation processing. The purified form of natural rubber is polyisoprene which can also be produced synthetically. Natural rubber is used extensively in many applications and products.
It is naturally very elastic, flexible and waterproof. Contrarily, there are many different chemical types of synthetic rubber — each with its own advantages and disadvantages, its own spectrum of properties and its own particular area of usefulness. It is important to understand that there is not a single type of rubber that is better than all others in an absolute sense. The choice depends on what properties are essential for a particular application.
When more than one rubber can meet the requirements, certainly then price and availability would be considerations. The earliest commercial synthetics were developed in direct response to the growing need for elastic materials with better resistance than natural rubber to oil, to heat, to sunlight and aging.
Chloroprene, aka neoprene, offered improvement in all respects. There is an exhaustive litany of mechanical, chemical, physical and specialized tests to measure specific outcomes to help you determine which rubber material best fits your specific application.
If you have any specific questions that your would like us to answer, email your questions to sales warco. If you have any specific questions that your would like Mark Johnson to answer, email your questions to sales warco. Chemical Resistance Guide. The latex proteins in rubber made from Hevea brasiliensis can produce severe allergies in certain people, even when they are exposed to very small amounts.
The latex proteins are very difficult to separate from the rubber in the purification process. Since these allergies can be so dangerous, an alternative to rubber that does not contain these latex proteins would be advantageous.
The conditions needed to grow these rubber trees are very specific and only occur in certain areas in the world. Most of our natural rubber is produced in a small region of Asia, making the supply vulnerable to damage. It would be helpful to be able to find other plants producing rubber that can be grown in other areas of the world. Not all rubber-containing plants produce good-quality rubber. Some plants that have been considered as alternative rubber sources are guayule, Russian dandelion, rubber rabbit brush, goldenrod, sunflower, fig tree, and lettuce.
Two of these plants seem to be the best alternatives to Hevea brasiliensis : guayule and Russian dandelion. Guayule Parthenium argentatum is a native shrub of the north plateau region of Mexico, which usually grows in limestone soils in areas with very low rainfall Figure 3C. Guayule grows best when temperatures are between 18 and Under these conditions, it can live for 30—40 years.
Rubber is found in the stems and in the roots of guayule, and it is found in the individual cells of the plant, instead of in latex vessels or tubes. The rubber content of guayule increases over a period of several years. Rubber from this plant is studied for biomedical applications, because it does not cause allergies. In order to extract the rubber from the plant, guayule tissue must be thoroughly softened and smashed up to free the rubber particles contained in the individual cells.
The quality of rubber from guayule is not good enough for all uses, because it has more impurities than does rubber from Hevea brasiliensis. The other good option for rubber, Russian or Kazak dandelion Taraxacum koksaghyz , is a fast-growing plant with a high-quality rubber that was discovered in in Kazakhstan Figure 3D. Kazak dandelion grows very close to the ground, can be grown in regions with mild temperatures, and produces yellow flower heads they look like a flower but they are a dense group of small flowers without stem.
Kazak dandelion contains rubber in the leaves, flowers, and roots, but only rubber in the roots is good for extraction, due to its higher quality and quantity.
For rubber extraction , Russian dandelions must be either pressed or mixed [ 5 ]. Kazak dandelions have another advantage—they also produce a carbohydrate called inulin, which is a substance that can be used in foods as well as the production of medicines against cancer, biofuels, or even bioplastics plastics made out of natural products. At this point, it is still too expensive to extract the rubber from Kazak dandelions. Through research, a plant with bigger root and higher rubber content can hopefully be developed.
Even though the rubber tree is the best source of rubber available today, it is facing some important threats. Rubber is only produced from plants that grown in certain unique areas. If you require a wide variety of high-quality rubber products , ranging from matting to seals and extrusions, look no further than Coruba. This entry was posted on October 15, by Admin. Coruba is one of the UK's leading providers of high-quality rubber products and rubber matting.
All Rights Reserved. Welcome to UK's 1 choice for all things rubber! Advanced Search. How is Rubber Made? Posted On: 15 Oct by Admin. Recent Posts. Most relevant matches are shown.
Click Search for more items. Asbestos Robert H. Dorothy at Skyrie Evelyn Raymond. Ancestors Gertrude Atherton. Also called: India rubber , gum elastic , caoutchouc a cream to dark brown elastic material obtained by coagulating and drying the latex from certain plants, esp the tree Hevea brasiliensis. Word Origin for rubber C origin unknown. An elastic material prepared from the milky sap of certain tropical plants, especially the tree Hevea brasiliensis. Rubber is a polymer that is used, after processing, in a great variety of products, including electric insulation and tires.
In its pure form, it is white and consists of repeating units of C 5 H 8. Any of various synthetic materials having properties that are similar to those of this substance.
0コメント