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Bursting Charges

This page contains 9 formulas.


DANGER:  Burst charges have a high rate of burn and are considered explosive. Extreme caution must be exercised when preparing, handling, or using any burst composition.

Perchlorate-based bursting charges
 
Shimizu  Shimizu  Shimizu  Shimizu  unknown  unknown 
name KP No.5 No.44 No.46 Whistle mix 
Potassium perchlorate  70 70 70 70 70 70
Sulfur 12
Charcoal 18 30 30
Lampblack 25
Aluminum, German black  30
Sodium benzoate 30
Potassium dichromate +5 +5
Dextrin +2 +2 +2 +2
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Chlorate-based bursting charges

CAUTION: Chlorate-based burst charges should never come into contact with sulfur or sulfur-bearing substances. Use of a flash bag or similar container is recommended.
 
Shimizu 
name H3
Potassium chlorate  77
Charcoal 23
Dextrin +2
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Nitrate-based bursting charges
 
Shimizu 
name  BP
Potassium nitrate  75
Sulfur 10
Charcoal 15
Dextrin +2
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Ofca bursting charge
 
Ofca 
Potassium perchlorate  23
Potassium nitrate 22
Barium nitrate 11
Sulfur 11
Antimony trisulfide 11
Aluminum, flake, 325 mesh  22
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Burst composition to carrier ratios

NOTE: It is not necessary to employ a carrier such as rice hulls or cotton seeds for aerial shell bursts, but using one does spread the fire more rapidly throughout the burst composition. It also conserves the amount of burst composition used by filling some of the space in the shell or flash bag. The following ratios are suggestions only; experimentation through trial and error with various burst charges, with or without carriers, is the best way to decide what is right to use.
 
Shimizu  Shimizu  Shimizu 
shell size  3" and smaller  4" to 6"  8" and larger 
Burst composition  80 52 52
Carrier 20 48 48
Burst type Perchlorate-based  Perchlorate-based, 
chlorate-based 
Perchlorate-based, 
nitrate-based 
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Bursting charge amounts for chrysanthemum shells

NOTE: The following bursting charge amounts are suggestions only; experimentation through trial and error with various burst charges and the amount used is the best way to decide what is right to use.
 
Shimizu  Shimizu  Shimizu  Shimizu  Shimizu  Shimizu  Shimizu 
shell diameter  3"  4"  5"  6"  8"  10" 12" 
Bursting charge amount  40 g  56 g  70 g  140 g 395 g 950 g 1250 g 
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Last updated April 22, 1998, by Andrew Krywonizka.
Copyright (C) 1997,1998, Andrew Krywonizka.  All rights reserved.