Stone paper is a brand-new material made in Taiwan, and being marketed under a brand name "Keeplus" in Japan. This high performance paper is prepared by the film processing of calcium carbonate (CaCO3) from limestone with high-density polyethylene (HDPE). The content of CaCO3 ranges from 56 to 80% according to the product grades. Both CaCO3and HDPE are very familiar in our daily life. This material is placed on sale in major advanced nations such as Japan, United States of America, England, France, Germany, Italy, Australia, Canada and China. The production of stone paper is not concerned in wood cutting, water consumption and other chemicals such as dyes and bleaching agents in the manufacture process, resulting in less environmental influences. Especially, environmentally-friendly companies have used the stone papers both in domestic and overseas territories. In the future, high resistance to water and rupture strength of the stone paper would become fit for various purposes in use.