| 摘要 |
<p>Gypsum-based fine plaster. Easily processed plastering with good sound insulating properties and strength above that of bricks is made by mixing 1000kg. gypsum with 2 kg. powdered ammonia and mixing with 180-200 1 water when required for use. The dry gypsum/NH3 powder can be packed in bags and is non-hygroscopic.</p> |
