| 摘要 |
Designed to give a low energy trail with high resistance to harmful external influences and to inhibit any side shock waves, the inner core of the tubing holding the powder contains an inert powder such as a blend or Na carbonate and Na chloride, ammonium carbonate or double salts of aluminium or cryolite. The outer covering or the tubing is a band of paper, fabric or plastic covered with spun natural or synthetic fibres. The whole is sprayed with thermoplastics or rubber. |
