| 摘要 |
<p>In an example the soln. included (by vol.) 5% mineral water, 50% sodium silicate solution including at least 15% sodium silicate, 45% highly mineralised water e.g. spring or volcano water and 28.35g dilute acid with a pH from 5.5 to 4. The solution was coated on the wood, penetrated it and gelled within it. (Provisional basic previously advised in Week 8408).</p> |
