With high quality shale as raw material, the products are extruded by hard plastic vacuum technology and sintered in tunnel kiln by fuel gas with stable high temperature.
产品采用优质页岩为原料，经硬塑真空挤压成型，在隧道窑中用燃气恒定高温烧结而成。
2
The experiment was done in the pressure-vacuum supersonic wind tunnel of Muroran Institute of Technology of Japan.