| 摘要 |
<p>Solid synthetic resin is used as an aggregate with cement such as Portland or an oxychloride for floors, wall facings, castings or mouldings. Other aggregates such as stone, fibrous material, carborundum, may also be added. Scrap phenol-aldehyde or urea-formaldehyde may be crushed or powdered before adding to the cement. The composition may be laid and after setting, ground and polished as is customary with terrazzo work. Specifications 217,279,275,541, [both in Class 22], and 519,078 are referred to.</p> |
