Natural rubber,Treatments to improve and modify natural rubber properties

How To Learn rubber  : Natural Rubber(India Rubber),Treatments to improve and modify natural rubber properties,Reclaimed Rubber,Synthetic Rubber,Rubber flooring materials for general purposes RUBBER It is essentially an elastic material and is obtained both as natural and as synthetic material.  Natural Rubber (India Rubber). Natural rubber  is present as an emulsion in the latex of certain plants growing in Ceylon, Singapore, Malaya and Mexico etc. Latex is the milky colloidal fluid oozing from vertical grooves having an upward inclination cut around the trunk of the rubber trees. Pots are tied to the trunk of trees for collection of lates. Crude rubber is obtained from the latex by its coagulation with acetic acid, alcohol, alum or lime etc. Coagulation of latex is achieved even by heating. In certain cases the latex is mixed with appropriate compounding materials and then precipitated directly from the solution to the shapes required. More modern methods are…

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Wood wool Building material

WOOD WOOL Generally it is bye-product of big timber industries in the form of shavings of light weight timbers like chir, deodar and kail etc. At times it may be specially prepared with the help of special planning machines. It is an effective heat and sound insulating material. It is fairly cheap and flexible. Generally it is used in packaging of delicate materials for transportation and in the manufacture of fibre boards. Wood wool Properties Wood wool fibers can be compressed and when the pressure is removed they resume their initial volume. This is a useful property for minimizing their volume when shipping. Due to its high volume and large surface area, wood wool can be used for applications where water or moisture retention is necessary. The width of wood wool fibers varies from 1.5 to 20 mm, while their length is usually around 500 mm (depending on the production process). In…

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Rexine Building material

REXINE Rexine : Molten PVC is applied to cotton cloth coming out of calendering machine and the treated cloth is then subjected to pressure between steel rollers. It  is then printed in desired colours and patterns. It is finally polished with varnish and dried. It is available in rolls. It is mostly used in upholstery work. Leatheroid is synthetic leather used in making coverings for furniture and for interior decoration work. Rexine is the registered trademark of an artificial leather leather cloth fabric produced in the United Kingdom by Rexine Ltd of Hyde, near Manchester, England. It was made of cloth surfaced with a mixture of cellulose nitrate (a low explosive also used as the propellant in firearms rounds), camphor oil, pigment and alcohol, embossed to look like leather. Used as a bookbinding material and upholstery covering, Rexine was also widely used in trimming and upholstering the interiors of motor…

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Thermocol Building material

 THERMOCOL Thermocol : It is the trade name of a very light and cellular plastic material. Initially it is obtained in liquid form and then molded into desired forms. it is an excellent insulating material of heat, sound and electricity. It is very light, strong and durable. It resists dampness. Its compressive strength is 117 to 144 kg/cm2. It can be manufactured in any color, though it is mostly white in color. It is very soft, can be easily swan, cut, broken and scratched with nails. Uses. It is used for heat and sound insulation in refrigeration and air conditioning buildings. It is used in acoustic treatment and lining of ceiling and walls. Thermocol is available in slabs 50×50, 60×60, 100×100, 50×100 cm and 15 to 25 mm thick. Thermocol is another name for Polystyrene, it's a synthetic aromatic (benzene derivative) polymer made from the monomer styrene (a monomer is…

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Linoleum floors Building material

Learn : LINOLEUM : Linoleum floors Types of linoleum - Plain linoleum,Stamped or printed linoleum,Inlaid linoleum,Uses of linoleum, Thickness of linoleum LINOLEUM In it linseed oil is oxidized by exposure to air into a tough, rubber like substance which is then mixed with ground cork, wood flour, colouring matter and other ingredients. The resulting plastic material is pressed upon a backing of burlap. It is then thoroughly cured and seasoned by passing it through drying ovens to get linoleum which is used as floor covering for wood and concrete floors. After drying the whole surface is applied with transparent oil varnish. Types of linoleum Linoleum is of three types : plain, printed or stamped and inlaid. It is available in the form of tiles or as rolls 2.0 metre wide. Length of rolls is not less than 5.5 metre. overall thickness is 4.5, 3.2, 2.0 and 1.6 mm. Tiles are…

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Asbestos,Asbestos cement sheets,Asbestos cement boards,Bakelite

Asbestos :Properties,Uses, Asbestos cement sheets,Types of AC sheets,Asbestos cement flat sheets,unreinforced corrugated asbestos sheet,Asbestos cement boards,Bakelite ASBESTOS Asbestos is available in nature as a mineral in Marwar, Garhwal (in U.P.); Bhandara (in MP) and Mysore. It is a silicate of calcium and magnesium found in the form of very thin fibers in venin’s of metamorphic rocks. Properties : It has low water permeability, is vermin proof and resists rot. It is brown, grey and white in colour. It is good for heat sound and electric insulation. It is resistant to acids and alkalies. Its fibres are capable of being woven into fabrics. It is highly durable and is strong. Its specific gravity is 3.10 Its melting point is 1200-11 50ºC It acts as reinforcing material when mixed with ordinary Portland Cement. Uses. Asbestos is used extensively for heat insulation. It is used for making fire proof padding, packing sheets and…

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