mshaner

karlfoxman, on Jan 5 2006, 06:09 PM, said:

They will be expressed in parts, not percentages. There is good explination HERE from a few well respected guys.

Doh! Missed that "part"

I don't have formulations written in this format. Oddly enough, the referred to post was one of the first post I read in this forum and BigG has always been a big help to me.

Thanks again,

Shane

willd, on Mar 22 2004, 08:10 PM, said:

heres a composition i found in a database im not sure how well it works as ive never tried it but if you can get the chems u can give it a go

Electric Match
Source: PML, post by Mike Carter <pyro@primenet.com
Comments: This composition does not require the use of a bridge wire. The composition itself acts as a resistor. Comments from the poster: "The matches fire just fine on 200 feet of #16 guage wire and a standard 12V battery two at a time. Sometimes there's a delay...I haven't tested these on the high power electric firing systems so I don't know how they fare."
Preparation: 1) Bind in water. Make CMC & Water into a mostly soupy mess. Add components into a container and mix well. 2) Dip freshly stripped wire with both conductors about 1mm or slightly less between them, evenly parallel. The longer the exposed metal on the wire, the less Ohmage the match will have. Allow to dry in vertical hanging position. Redip as necessary. I find that two dips is just fine. 3) Once the comp is dry, you will need to coat it with NC (Nitrocellulose) laquer. I find that two dips in the NC laquer is enough to keep the very brittle comp from cracking or splitting while manuevering the wire into your shell or mine or rocket motor. I normally will color the double-dippers with some Iron Oxide stirred into the NC Laquer so I have a visual that they're unsuitable for firing whistle motors. (Double Dipped tend to go BANG, and destroy the motor).
Potassium chlorate, Ball milled into a fine powder.....16
Conductive lampblack..............................3
Magnalium (50/50), 200 mesh.......................3
Atomized aluminum, 120 mesh.......................2
Zirconium, 200 mesh (optional)....................2
CMC Binder (carboxymethylcellulose)...............5

Its been a long time since the string has been addressed, but that's just how busy life is sometimes

Disclosure: I'm an Rocketry EXer and have a good foundation of experience in the department of formulations, but I am still teachable.

That being said, the above formulation's numbers don't "add up" do they? What am I missing?

Thanks for the help

Thank you for all the insight. I've been contemplating this for about a month now. Frankly, my motivation is the fact that it drives me nuts know I have all these chips that I can't use in my propellants. Firefox ships them with the 325 mesh Mg. I spoke with Gary at Firefox just this week and his largest concern was with the moisture as I live in an area with high humidity.

To offset this, I'm going to load the barrel in the AC and will only mill the stuff 2-3 hours at a time and remotely, of course! I'm using a PVC barrel with a twist-in top and you know that is not airtight, if you will, so would it be better to open the top slowly or spin it right off? Also, I have no desire to take it down to a 325 mesh - just something useable.

Anymore thoughts

Shane

oops...poured I mean...

Shane

Sasman,

When you pour your ball media, where did you acquire the tin? And I'm thinking you live in the UK so the offer to sell off some of your antimony is probably a mute point as I am this side of the pond.

Oh well,

Shane