Sibirit SM™ - a substance intended for explosive breaking of rocks that contain no sulfides and with borehole waters of pH values above 4 except for the sites (bottom holes) with intensive methane emission and vulnerable to coal or other rocks ignition, with the method of borehole charges above ground.
Depending on the composition three grades of Sibirit SM™ are produced, representing a homogeneous blend of Sibirit-1200™ emulsion explosive and ANFO:
- Sibirit SM-7500™ - with the ratio of mass fractions of Sibirit-1200™ and ANFO 75/25 - intended for application in the boreholes with any degree of water presence;
- Sibirit SM-5000™ - with the ratio of mass fractions of Sibirit-1200™ and ANFO 50/50 - intended for application in the boreholes with any degree of water presence;
- Sibirit SM-2500™ - with the ratio of mass fractions of Sibirit-1200™ and ANFO 25/75 - intended for application in dry and dried boreholes.
Minimum blasthole diameter - 150 mm. Recommended depth of the boreholes - up to 50 m
Sleeping time:
- for Sibirit SM-7500™ - no more than 10 days;
- for Sibirit SM-5000™ - no more than 7 days;
- for Sibirit SM-2500™ - no more than 7 days.
The product will perform in temperatures ( free-air temperature) from -350C to +500C.
Main phisical-chemical and explosive properties of Sibirit-SM™ are given in the Table below.
| Properties | Sibirit SM™ |
||
|---|---|---|---|
| 7500 | 5000 | 2500 | |
| Calculated | |||
| The heat of explosion kJ/kg (kcal/kg) | 3028 (723) | 3329 (795) | 3623 (865) |
| Volume of explosive gases,L/kg | 1025 | 1008 | 990 |
| Oxygen balance,% | -3,3 | -2,2 | -1,1 |
| Experimental | |||
| Density kg/m3 | 900-1250 | 1000-1350 | 800-1150 |
|
Impact sensitivity as per GOST 4545-88: - lower limit,mm |
Above 500 | ||
| Friction sensitivity as per GOST R 50 835-95 on К-44-3: - lower limit, MPa |
Above 300 | ||
| Critical detonation diameter in polymeric cover, mm: | |||
| - AN-FO with porous AN | 40-50 | 80-90 | 30-50 |
| - AN-FO with AN (GOST 2-85) | 40-50 | 80-90 | - |
| Relative capacity by explosion crater in sand (compared with Trinitrotoluene) |
0,95-1,05 | ||
| Self-ignition temperature per GOST 12.1.044-89, oС, with time delay 16 sec |
340 | ||
| Minimum ignition energy, J | Above 1 | ||