| 摘要 |
<p>537,683. Rot-proofing; fireproofing. ANFT, P. Oct. 2, 1939, No. 27021. Convention date, Jan. 28. [Class 140] [Also in Group. V] Organic fillers, such as sawdust, paper waste and straw, for use in light concrete are mineralized and preserved from decay and fire by mixing them dry with ground burnt lime and adding sufficient water to slake the lime while still stirring, preserving agents such as potassium permanganate, potassium alum, sodium carbonate and sulphuric acid being added to the slaking water.</p> |
