| 摘要 |
The production of foams or compact materials by adding an acidic hardener to an aqueous system containing an organic material selected from urea-formaldehyde and thiourea-formaldehyde and allowing said system to set to a hardened mass, is improved by employing boron phosphate as the hardener. The urea-formaldehyde or thiourea-formaldehyde is used optionally together with an alkali metal silicate. A polyhydric alcohol such as glycerine and/or a gelling agent may also be included along with a foaming agent. |
