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Impact Sensitive

An explosive is considered to be impact sensitive if is can be shown to detonate under exposure to the types of impacts found in normal mining operations.

This would include impact from ground engaging tools (loader and dozer teeth) and drilling operations, crushing between rocks, grinding in a crusher and the like.

It does not include being struck by high velocity (supersonic) projectiles.

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Impact Sensitivity

Impact sensitivity testing can be completed using the BAM Fall Hammer apparatus developed by the German Federal Institute for Testing Materials (BAM). Impact energy is imparted to a 40mm3 sample by means of a falling weight. The limiting impact energy is determined as the lowest energy at which a flash, flame, or explosion is observed. The test is used to assess the sensitivity of the test material to drop-weight impact. The BAM Fallhammer test is a part of UN Test Series 3 which is used to assess the ignition sensitivity of suspected explosive materials. As many as 54 trials may be performed and therefore approximately 3 cubic centimeters (cc) of sample may be required.

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Impact sensitive products are known to have detonated under moderate impacts such would commonly occur in a drill and blast operation.

Sources of impact include drilling, machine excavation, rock crushing and the like.

Whilst there are products such as ANFO which are not considered impact sensitive there is always a potential, however small, for abuse of explosives to lead to adverse effects.

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In Situ

In its original position or place.

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Relates to goods which when mixed or otherwise brought into contact with each other, are likely to interact and increase risk because of the interaction.

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Inhibited Emulsion

Emulsion that has been rendered less sensitive to reactive ground through the addition of inhibiting chemical.
Inhibited explosives are generally less energetic than standard products.

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Initiating Systems

Blasting components which provide the transmission of signal, control of delay timing and the initial explosive energy within the blast hole.

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Initiation Plan

Initiation plan

Hard copy or electronic plan showing all the blast hole positions and the initiation system with all connections and products specified.
The initiation plan may also show the toe position where multiple angle holes are loaded as well as the blast hole firing times.

BlastPlan is the premier initiation design application available.

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Initiation Point

The location of the first hole in a blast to fire. Also the point at which the lead in line is attached to the pattern.

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Inter-row Timing

Is the delay time between rows.

Entry link: Inter-row Timing

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