| 摘要 |
<p>A filling composition e.g. for filling cracks or other defects in walls, ceilings etc, comprises an admixture of 15-40% by weight of 'primary' microspheres having a density of 0.3 to 0.4 g cc-1 and a resin system for effecting hardening of the applied composition. The composition is lightweight and, when hardened, is `self plugging' in the sense that a screw may be driven into the composition without the need for a separate plug.</p> |
