A Google search turned up that the Chinese have used a heat shield made of impregnated oak, and perhaps the Russians used a cork one. Some speculation: http:/

A Google search turned up that the Chinese have used a heat shield made of impregnated oak, and perhaps the Russians used a cork one. Some speculation: http://forum.nasaspaceflight.com/index.php?topic=11075.25;wap2 http://forum.nasaspaceflight.com/index.php?topic=11075.25;wa...