Rubber: Properties, Uses and Types | Engineering
It is used as a heat and sound insulating material. 4. Guayle Rubber: It is a variety of natural rubber available in North America. It is prepared from the branches of guayule, It contains 70 percent of hydrocarbon, 20 percent of resin, 10 percent of insoluble materials, cellulose, liquid etc. 5. Smoked Rubber: It is a variety of crude rubber.