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NB Blasting Training
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Conversion Tables

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Conversion Tables


Cartridge Specifications - 70%

Cartridge Size (millimetres)Cartridges per CaseWeight per Cartridge (grams)Weight per Case (kilograms)
22 x 20025026497
25 x 200195207124
30 x 200154165156
32 x 200125133193
40 x 2008894274
45 x 2006569374
50 x 2005457454
65 x 2003436714
75 x 20024251,040
32 x 4006266390
40 x 4004346560
45 x 4003234760
50 x 4002627940
60 x 40020211,220
65 x 40017181,430
75 x 40012-2,080
90 x 400--2,780

Conversion Factors

English to Metric

EnglishMetric
1 Inch2.54 Centimetres (cm)
1 Foot30.48 Centimetres (cm)
1 Mile1.61 Kilometres (km)
1 Ounce28.35 Grams (gm)
1 Pound0.45 Kilograms (kg)

Metric to English

MetricEnglish
1 Centimetre (cm)0.39 Inches
1 Metre (m)3.28 Feet
1 Kilometre (km)0.62 Miles
1 Gram (gm)0.035 Ounces
1 Kilogram (kg)2.20 Pounds

Cartridge Specifications - 40%

Cartridge Size (millimetres)Cartridges per CaseWeight per Cartridge (grams)Weight per Case (kilograms)
22 x 200207219117
25 x 200161171150
30 x 200129137189
32 x 200105111231
40 x 2007276338
45 x 2005356459
50 x 2004144588
30 x 4006569373
32 x 4005356459
40 x 4003638676
45 x 4002627943
50 x 40019201,280
65 x 40013-1,920
75 x 4009-2,780
90 x 4007-3,570

Cartridge Specifications - 75%

Cartridge Size (millimetres)Cartridges per CaseWeight per Cartridge (grams)Weight per Case (kilograms)
25 x 200179189136
30 x 200139147175
32 x 200117123208
40 x 2007781316
45 x 2005761424
50 x 200-46562
32 x 4005761424
40 x 4004042610
45 x 4002729893
50 x 40022231,110
45 x 60020211,220

Electric Blasting Caps - Average Resistance in Ohms

Length of Leg Wire (Feet)E.B. Caps, LPV Delays (Copper Wire)SHORT-PERIOD Caps (Iron Wire)SHORT-PERIOD Caps Non-Incendive (Copper Wire)SEISMOCAP E.B. Caps (Copper Wire)
41.232.180.772.54(2)
61.322.710.852.58
81.403.250.942.63
101.513.991.022.48
121.574.321.112.73
141.685.011.192.77
161.745.411.232.82
201.916.511.442.92
242.077.561.613.01
301.56(1)--3.15
361.71--3.30
401.80--3.39
502.04--3.63
602.28--3.87
70---4.11
80---4.34
1003.23--4.82
150---6.01
200---7.20

Tolerance: ±0.25 (E.B. Caps), +0.45 (Iron Wire), +0.20 (Non-Incendive)

Notes:

  1. Leg wire of this length, and longer, supplied in 0.030" diameter.
  2. All SEISMOCAP E.B. CAPS supplied with leg wires of 0.030" diameter.

Copper Lead Wire - Resistance and Capacity for Blasting Purposes

Wire Size (B&S Gauge)Resistance (Ohms per 1000 Feet)Capacity (Amperes)
00000.04902250
0000.06181750
000.07791500
00.09831250
10.12391000
20.1563900
30.1970800
40.2485700
50.3133540
60.3951500
80.6282350
90.7923280
100.9991250
121.588170
142.525130
164.01660
186.38530
2010.1515
2320.367

Resistance of Electric Detonators (Copper Wire Only)

Legwire Length (metres)Resistance (ohms)
21.35 ± 0.25
31.55 ± 0.25
41.70 ± 0.25
51.85 ± 0.25
62.00 ± 0.25
72.20 ± 0.25
101.85 ± 0.25
122.10 ± 0.25
152.35 ± 0.25
202.75 ± 0.25

Resistance of Commonly Used Lead Wires

Wire Size (B&S Gauge)Resistance (ohms per 100 metres)
100.328
120.521
140.828
161.347
183.330
206.680

Load Per Foot (Metre) of Explosives Column at a Density of 1.0 g/cm³

Small Diameter (1" - 6 1/4")

Diameter (inches)Diameter (centimetres)Load (lb./foot)Load (kg/metre)
12.540.340.51
1 1/82.860.430.64
1 1/43.180.530.79
1 3/83.490.640.95
1 1/23.810.771.15
1 5/84.130.901.34
1 3/44.451.041.55
1 7/84.761.201.79
25.081.362.02
2 1/85.401.542.29
2 1/45.721.722.56
2 3/86.031.922.86
2 1/26.352.133.17
2 5/86.672.343.48
2 3/46.992.573.82
2 7/87.302.814.18
37.623.064.55
3 1/87.943.324.94
3 1/48.263.595.34
3 3/88.573.875.76
3 1/28.894.176.21
3 5/89.214.476.65
3 3/49.534.787.11
3 7/89.845.117.60
410.165.458.11
4 1/810.485.798.62
4 1/410.806.159.15
4 3/811.116.519.69
4 1/211.436.8910.25
4 5/811.757.2810.83
4 3/412.077.6811.43
4 7/812.388.0812.04
512.708.5112.66
5 1/813.028.9413.30
5 1/413.349.3813.96
5 3/813.659.8414.64
5 1/213.9710.3015.33
5 5/814.2910.7716.03
5 3/414.6111.2616.76
615.2412.2618.25
6 1/815.5612.7719.00
6 1/415.8813.3019.79

Medium Diameter (6 3/8" - 10")

Diameter (inches)Diameter (centimetres)Load (lb./foot)Load (kg/metre)
6 3/816.1913.8420.60
6 1/216.5114.3921.42
6 5/816.8314.9422.23
6 3/417.1515.5123.08
6 7/817.4616.0923.94
717.7816.6824.82
7 1/818.1017.2825.72
7 1/418.4217.9026.64
7 3/818.7318.5227.56
7 1/219.0519.1528.50
7 5/819.3719.8029.47
7 3/419.6920.4530.43
7 7/820.0021.1231.43
820.3221.7932.43
8 1/820.6422.4833.45
8 1/420.9623.1734.48
8 3/821.2723.8835.54
8 1/221.5924.6036.61
8 5/821.9125.3337.70
8 3/422.2326.0738.80
8 7/822.5426.8239.88
922.8627.5841.04
9 1/823.1828.2542.19
9 1/423.5029.1343.35
9 3/823.8129.9344.54
9 1/224.1330.7345.73
9 5/824.4531.5446.94
9 3/424.7732.3748.17
9 7/825.0833.2049.41
1025.4034.0850.72

Large Diameter (10 1/4" - 22")

Diameter (inches)Diameter (centimetres)Load (lb./foot)Load (kg/metre)
10 1/426.0435.7753.23
10 1/226.6737.5455.87
10 3/427.3139.3558.56
1127.9441.1961.31
11 1/428.5843.0964.13
11 1/229.2145.0367.01
11 3/429.8547.0069.94
1230.4849.0373.97
12 1/431.1251.0976.03
12 1/231.7553.2079.17
12 3/432.3955.3582.37
1333.0257.5285.63
13 1/234.3962.0492.89
1435.5666.7299.31
14 1/236.8371.57106.54
1538.1076.59114.01
15 1/239.3781.78121.74
1640.6487.14129.72
1743.1898.37146.44
1845.72110.29164.18
2050.80136.16201.49
2255.88164.75245.25

This document is the property of Maritime Blasting Services Ltd., Moncton, NB