... high-strengh high-qiality wool board, cutalong the length direction of the board, the filp can be made of rock wool ... ball size>63umThe thermal conductivity of the rock wool board0.0360.0360.038W/mkThe thermal conductivity of the core material lath0. ... tensile strength, good stability, does not produce thermal expansion or contraction, aging resistance, good compatibility with systerm, etc can provide ...