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nature : commonly known as cork. Plant stem and root growth after thickening to the surface protection organizations. Many radiation with a flat cells. Often cell cavity containing resin and tannic compounds, or full of air, thus friedelin often color, texture is light, soft, flexible, waterproof, the chemical was not easy, but it is electrical, thermal and acoustic bad conductor. Use a wide, such as system stopper, refrigeration equipment insulation layer, life preserver, such as noise barriers. Mainly from the oak achieved. Because of these trunks friedelin especially developed.
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