Blasting Latest Update 2026 (Questions
and Answers-Verified solutions)
Distance from mag for no smoking/open flame - Correct
Answers ✅15m
Define detonation - Correct Answers ✅A shockwave and
sudden release of heat and gas
Define velocity of detonation - Correct Answers ✅the
speed at which the shockwave travels through the column of
explosives
SFA burning speed at sea level - Correct Answers ✅131
s/m +/-10%
Do SFA burn slower or faster at high elevation compared to
sea level - Correct Answers ✅Slower at high elevation -
less air pressure
What is the minimum length of SFA that can be used? -
Correct Answers ✅1m
What else can make an SFA burn faster? - Correct Answers
✅Confinement, pressure
What can make SFA burn slower or misfire? - Correct
Answers ✅moisture, chemicals, oil, solvent, kinks, bends
, Blasting Latest Update 2026 (Questions
and Answers-Verified solutions)
How long do you wait to deal with an SFA misfire - Correct
Answers ✅30min or manufacturers recommendation,
whichever is longer
What is a static shunt - Correct Answers ✅metal staple
embedded in the detonator. Its purpose is to drain static
electricity to help prevent premature detonation
What is the Blast Site - Correct Answers ✅Under OHS
regulation, the blast site is defined as the area that extends
15m/50ft in all directions from explosives.
What is the danger area - Correct Answers ✅The danger
area is at least as big as the blast site (15m from primed
explosive), but actual size will be situation-specific. It will be
determined by the blaster based on the amount of explosives
used, the blasting technique and material blasted, and the
potential for environmental instability
What is the detonation speed of Det Cord? - Correct
Answers ✅7000 m/s
What is the core of Det Cord made of? - Correct Answers
✅PETN
and Answers-Verified solutions)
Distance from mag for no smoking/open flame - Correct
Answers ✅15m
Define detonation - Correct Answers ✅A shockwave and
sudden release of heat and gas
Define velocity of detonation - Correct Answers ✅the
speed at which the shockwave travels through the column of
explosives
SFA burning speed at sea level - Correct Answers ✅131
s/m +/-10%
Do SFA burn slower or faster at high elevation compared to
sea level - Correct Answers ✅Slower at high elevation -
less air pressure
What is the minimum length of SFA that can be used? -
Correct Answers ✅1m
What else can make an SFA burn faster? - Correct Answers
✅Confinement, pressure
What can make SFA burn slower or misfire? - Correct
Answers ✅moisture, chemicals, oil, solvent, kinks, bends
, Blasting Latest Update 2026 (Questions
and Answers-Verified solutions)
How long do you wait to deal with an SFA misfire - Correct
Answers ✅30min or manufacturers recommendation,
whichever is longer
What is a static shunt - Correct Answers ✅metal staple
embedded in the detonator. Its purpose is to drain static
electricity to help prevent premature detonation
What is the Blast Site - Correct Answers ✅Under OHS
regulation, the blast site is defined as the area that extends
15m/50ft in all directions from explosives.
What is the danger area - Correct Answers ✅The danger
area is at least as big as the blast site (15m from primed
explosive), but actual size will be situation-specific. It will be
determined by the blaster based on the amount of explosives
used, the blasting technique and material blasted, and the
potential for environmental instability
What is the detonation speed of Det Cord? - Correct
Answers ✅7000 m/s
What is the core of Det Cord made of? - Correct Answers
✅PETN
