... is one kind of special composite construction with 5 layers, it’s an organic bond after special hot ... Feature:1. Small linear expandability coefficient, only 1/5 of the pure plastic pipe, almost equal to ... 43-52W/M.K, Copper: 383W/M.K )5. Tight connection, easy installation. The exterior layer is convenient ... ;4. Caliduct, floor, wall-applied heating unit;5. Snow melt unit in building in North China;6 ...