The compounding technique of PQ was described and its influences to cement thickening time and application in highdensitycement system were evaluated, as well as its temperature sensitivity.
This high packing density accounts for the strength and stability of cement, which makes it useful for structures like tunnels and Bridges.
这种高堆积密度说明了水泥的高强度和稳定特性，使其成为隧道和桥梁等建筑物的理想材料。
3
Polyester, polypropylene, highdensity vinylon filter cloth is widely used in the pharmaceutical, chemicals, dyes, smelting, cement, mining and other enterprises in production.