... of resin 3.Low shrinkage and warpage 4.More economical 5.Adjusting density High-performance hollow ... materials at twenty-first century. Its true density is 0.20-0.60g/cm3 with ... It owns features with light weight, large bulky, low thermal conductivity, high compressive strength, smoothly mobility. ... be used to produce high-strength low-density cement slurry and low-density drilling fluid in oil and gas ...