Rubber is a crop that grows in suitable areas following there is not raining too much or too little, the average temperature is about 24 - 27 degrees Celsius, the average relative humidity not less than 65 percent all the year, selection the species of rubber suitable the environment to be able to resist disease as well and high yielding latex rubber. Currently rubber species used species is improved by Rubber Research Institute of Agriculture to provide suitable for each area. After selecting trees to be planted, farmers have to take care of rubber trees until the age of 4-5 years and able to tappers rubber trees until the age of 18-23 years. Then rubber trees were sold to sawmills and rubber from the tree is used to make rubber latex or rubber sheets. In Thailand, rubber sheets are popular because rubber farmers in Thailand are a small rubber plantations there is no more productivity of rubber when rubber tapper. Therefore, farmers transform rubber sheets and kept a sufficient amount to be sold to the dealer or factories. The structure production of Thailand's rubber sheets more than other types of rubber. Although there are some period demand of rubber latex increased such as the epidemic of AIDS cause the demand for rubber gloves and condom increased, but it is only a small part when compared with the productivity of rubber sheets.