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Mains Firing

The use of electric power from a mains power supply for firing explosive charges.

Entry link: Mains Firing

Mass Strength (or Weight Strength)

The explosive strength of a unit mass of an explosive material expressed against a standard reference.
Note: in this Code any reference to Mass Strength is with reference to TNT as the standard.

Entry link: Mass Strength (or Weight Strength)


Of or pertaining to a large mass, much larger than normal.

Entry link: Massive

Material Safety Data Sheet

A material safety data sheet (MSDS), or product safety data sheet (PSDS) is an important component of product stewardship and occupational safety and health. It is intended to provide workers and emergency personnel with procedures for handling or working with that substance in a safe manner, and includes information such as physical data (melting point, boiling point, flash point, etc.), toxicity, health effects, first aid, reactivity, storage, disposal, protective equipment, and spill-handling procedures. MSDS formats can vary from source to source within a country depending on national requirements.

pentolite msds

Entry link: Material Safety Data Sheet

Mean Average

The arithmetic average of a range of values.

Entry link: Mean Average


The insulation resistance (IR) test (also commonly known as a Megger) is a spot insulation test which uses an applied DC voltage (typically either 250Vdc, 500Vdc or 1,000Vdc for low voltage equipment <600V and 2,500Vdc and 5,000Vdc for high voltage equipment) to measure insulation resistance in either kΩ, MΩ or GΩ


Meggers actively power circuits with high voltages and should never be used to test circuits containing electric detonators.

Megger 2


See also Multimeter

Entry link: Megger


The maximum charge, in kilograms, initiated at any instant of time.

MIC is used to limit charge weight for ground vibration control.

The underlying assumption is that charges that are separated by a minimum time delay do not reinforce with regards to vibration and can be treated separately.

reinforcing vibs

Whilst this assumption is known to be flawed it helps to understand how vibrations reinforce and cancel.

Due to some work carried out in the 1960's the minimum separation for charges to be considered independent for ground vibration is 8 milliseconds.

This is known as the 8 millisecond rule.

Maximum Instantaneous Charge (MIC) is calculated by blast software such as BlastPLAN-PRO


Entry link: MIC


Term sometimes used where a pre-split firing is integrated with the adjacent dependent production blast.

Entry link: Mid-Split


1/1000th of a second

Entry link: Millisecond

Millisecond (MS) Series

Delay detonator series with relatively short (commonly 25MS) delays between adjacent numbers.

MS Detonators are designed for in-hole use to initiate a primer and are generally of #12 / #8* strength which is a base charge of about 1 gram total.

Entry link: Millisecond (MS) Series

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