| 摘要 |
<p>Ground marking material, characterised by the fact that it comprises of the order of 20% to 70% by weight of a slurry based essentially on particles of calcium carbonate, at least a significant part of which particles has a mean statistical diameter of the order of 2 microns at most, and a load of particles which are compatible with those of the calcium carbonate, at least a significant part of which particles has a mean statistical diameter at least of the order of 5 microns.</p> |
