The product is a needle-like inorganic inert powder with thixotropy. Under the action of high shear force, the needles in the colloidal system are separated and parallel to each other so that the colloids become thin; when the shearing force stops, these needles cross each other and become a firm colloidal network. . This mutual transformation of the thinning of the shear force and the stoppage of the external force can be infinitely cycled. The product has excellent anti-sag, anti-sag effect.