It oozes from superficial cuts in rubber trees and is collected in containers. Latex is a milky colloidal fluid containing from 30 to 40 percent of the rubber, the remaining being mainly water and a small amount of protein and resinous material. Small quantities of rubber are produced in Brazil from uncultivated trees and from the guagle shrub in Mexico and south western United States. Hevea prasiliensis, grows on plantations, mainly in Sri Lanka and Malaya Peninsula. More than 95 per cent of this rubber is obtained from the latex of rubber trees. Natural rubber is an elastic material present in the latex of certain plants. The following are some of the uses of rubber:ġ0. For butyl rubbers the working temperature can be as high as 90☌. For normal rubbers the maximum operating temperature is usually considered to be 55☌, for rubbers of great heat resistance it is equal to 65☌. Only specially compounded rubbers can maintain their electrical characteristics nearly unchanged when kept continuously in contact with moisture.ġ7. Although rubber is practically water and gas tight its electrical characteristics are affected by moisture, especially for rubbers, compounded with considerable quantities of the substances which increase the sensitivity to moisture. electric strength of rubber is 2 to 2.5 times the electric strength at 50 Hz.ġ6. When left unstretched and subjected to a short-time 50 Hz test voltage, rubber will have an electric strength within the following limits, -depending on the pure rubber constant.įor a 20 to 25% rubber content: 20 to 30 kV/mmįor 30 to 35% rubber content: 30 to 45 kV/mm
![rubber hose 2 after effects free download rubber hose 2 after effects free download](https://softotornix.com/wp-content/uploads/2020/03/RubberHose-v1.0-for-Adobe-After-Effects-Allowed-Free-Download4.jpg)
The electric strength of organic rubbers strongly depends on the kind of current involved, the degree of stretch, and the time during which the voltage remains applied.