| 摘要 |
<p>Composition for impregnating porous materials, in which the composition contains at least one component having preservative properties or which releases a component having preservative properties on heating, the composition comprising an emulsion of water and oil containing a primary surfactant and an amphoteric additive, the pH of the emulsion being equal or approximately equal to the iso-electric point of the amphoteric additive. The compositions of the invention are particularly useful in the preservation of timber.</p> |
