We use some "military grade" detonators at work, and the igniter in
them is a small modular unit, that's crimped into the det after the
PETN and lead azide is pressed in. We use two types, the first is a
1A/1W det (i.e. you can apply 1 A at 1 W for 300 seconds with No
Fire), and the other is "less safe" (i.e. easier to fire). I believe
the 1A/1W type are considered the "gold standard" for bridegwire-type
dets or other electrical igniters to withstand HERO (Hazards of
Electromagnetic Radiation to Ordnance), or stray RF frequencies that
might ignite your igniter prematurely. See MIL-DTL-23659; there's
details of the test methods in there for RF and also for static
discharge.
I'll put the NO FIRE and ALL FIRE specs for the dets we use below:
1A/1W type:
NO FIRE 1.05 A for 300 s
ALL FIRE 3.10 A for 40 ms
(Recommended firing current > 4 A for 10 ms)
Other type:
NO FIRE 180 mA for 300 s (max.)
ALL FIRE 2 A for 10 ms (min.)
On Tue, 5 Jan 2021 at 20:48, Dr Edward Jones <RocketPioneer@xxxxxxxxx> wrote:
Are there 'best practices' or usual standards for NO-fire and
SURE-fire power for amateur solid rockets? I'm developing some
atypical bridgewires. Thanks.
Edward in Socorro