| 摘要 |
<p>The scourer elements are made by (1) preparing an abrasive product consisting of a relatively high viscosity fluid formed from a combination of a fluid vehicle and an abrasive charge, (2) impregnating a block of flexible closed-cell polyurethane foam on the surface to be used for scrubbing with the abrasive product and (3) drying, cross-linking and solidifying the impregnated assembly.</p> |
