A car small tyre weighs about 7.5 kilos - about 30% is Natural rubber, 30% synthetic polymer, 16% reinforcing material (wire cord and textile), 11% chemicals and 13% filler (chalk like stuff). So car tyres have about 2.5 kilos and up depending on size.
Natural rubber is a polymer built up of isoprene units. Latex is found in nature. It comes from rubber tree (Hevea Brasiliensis). Latex coagulates naturally and turn into dry natural rubber. Normally, latex containing 25 to 40% of dry rubber.
Only carbon, hydrogen, and oxygen in pure natural latex, but rubber articles of manufacture usually contain other elements to improve the properties of the natural rubber for specific applications. Sulfur and zinc oxide are common additives to rubber.
It depends on the style of shoe: some contain natural rubber, synthetic rubber, leather, plastic, nylon, canvas, and polyurethane. Most contain foam insulation.
Natural rubber is made from latex, a substance derived from tropical plants. Rubber can also be produced synthetically; synthetic types of rubber may contain no raw materials.
"Rubber" is a generic term for polymers or copolymers with certain elastic characteristics. It can be made from natural sources (renewable materials) such as rubber tree sap which contain natural latexes, or from petrochemical sources which are non renewable
rubber bands do contain sulfur
Mixing natural rubber with nitrile rubber is possible. In fact, it is quite common to mix natural rubber with other kinds of rubbers.
natural rubber is more elastic than synthetic rubber
Natural rubber is created from the sap of the Rubber Tree. In fact, that is the only thing needed from the tree to produce natural rubber.
Natural rubber
There is no such thing as a natural rubber, rubber is man made.
There is natural rubber, made from the latex of the rubber tree (Hevea brasiliensis).There are several manmade rubber compounds, including butyl rubber, neoprene, and nitrile rubber.