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holmes1880
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@grexy
Normal quantities of secondary work via thermal principle- a #8 is a #8. The blasting cap costs come largely from the cost of the capsule and all the
surrounding equipment needed to perform operations- not the 1g quantities of the cap powder.
As far as ETN, I believe in doing away with it, but it is safer than NG in impact and thermal stability. You said "making NG"... he must have had a
violent runaway then?
@rosco
Not everyone is a robot who can ignore the minor probability of a blasting cap going off from static. There have been accidents both static and
mechanical with caps. Mishandling is often the cause, but mishandling happens quite a bit. But it's OK, if you're LA type of guy- the odds are on your
side, indeed.
[Edited on 24-6-2011 by holmes1880]
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quicksilver
International Hazard
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Actually the costs of a blasting cap (as an example) come from enormous amounts of production and handling/contact control. on each capsule
(generally) there is a stamped sequence number of where it was produced, who (what shift) handled it and the time it was officially added into
inventory. Then there is a further (often non-permanent) stamp on the carton showing who is the attendant supplier and what part of a bulk sales
inventory the cap carton is from. So we have two sequences - one actually permanently stamped into the capsule and another stamped into the container.
That's a Hell of a lot of paper work and it's continual. Secondaries always have taggents today but even caps may have taggents if they are mfg in
certain conditions. The taggents also have commensurate paper work.
Controlling all those records is what actually boosts the price beyond logical. This is a classic example: A carton of "fuse caps" in the 1950's used
to cost about $2.50 per 100 units. "Fuse caps" are actually only made by one (or maybe 2) mfg in the USA. The rest are Nonel caps as no one really
even uses fuse any more. They are no longer sold as 100. but sold as dozens. Electric caps are the most common (w/ a zero time delay). They used to
sell for 50 cents per unit in a carton of 100. They sell for approx $10 per individual in boxes of 100 in special circumstances. They typically sell
in half and full dozen small containers for $16-$20 per unit. There has been little change in electric, zero delay caps other than the immense record
keeping (which is actually more than I briefly described here). All those records have to be available locally (at point of mfg) and copied to other
agencies at time of construction.
All the numeric and taggent controls mean little if not handled with the most anal of record-keeping sophistication! THIS is what has taken a cap that
really did sell for 20cents and make it virtually impossible to obtain today and one that sold for fifty cents; which today sells for up to $20.
Detonators are the single most expensive expenditure in modern blasting / construction / demolition.
Source: Journal of Explosives Engineering (isee.org)
[Edited on 25-6-2011 by quicksilver]
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holmes1880
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Thanks for the info, silver. The labor is therefore the largest cost factor. Makes sense since it's a regulated, dangerous industry.
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freedompyro
holmes1880
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After recrystallization in boiling ethanol and boiling acetone...
Both are a total failure to make proper crystals of any recognizable size. In the second case the acetone was even filtered and evaporated.
All I have been able to achieve is highly sensitive low density white fluff and higher density granular white fluff... LoL! It may not be possible to
get MHN to crystallize anything like ETN.
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