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Hot Prime


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#1 utmustang07

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Posted 23 July 2012 - 03:04 PM

Hellow every one,
I built a star roller last week and put it to use over the weekend. It worked well but the white star comp I used will not start the stars with a BP prime. Using the same prime and cutting the stars seemed to work ok. Any sujestions for good hot prime as well as why rolling the stars made them harder to start?
Thanks
Dave

#2 dagabu

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Posted 23 July 2012 - 05:15 PM

Hellow every one,
I built a star roller last week and put it to use over the weekend. It worked well but the white star comp I used will not start the stars with a BP prime. Using the same prime and cutting the stars seemed to work ok. Any sujestions for good hot prime as well as why rolling the stars made them harder to start?
Thanks
Dave


IMHO, rolling stars makes the little particles fit more snugly together. Pretty scientific huh? Posted Image

Try a stepped prime, it has worked for most of my stars. Take 75% BP and 25% your comp, prime with that, now 50%-50%, then 75%-50% and finish with 100% BP.

-dag
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#3 taiwanluthiers

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Posted 24 July 2012 - 08:41 PM

have you tried bp mixed with silicon?

#4 utmustang07

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Posted 26 July 2012 - 07:34 AM

Thanks for the response. Is the Silcon in powder form? I have not used it before..

#5 utmustang07

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Posted 26 July 2012 - 07:43 AM

As an interesting side note. I gave a handfull of the stars inquestion letting him know that I could not get them to light. He loaded a 3" shell with them and he said they did light.

#6 chemtech89

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Posted 12 December 2012 - 12:13 AM

What do you use for break charge? boosted? What white star formula are you using (post formula)?

Yes, meaning silicon in powdered form, 325 mesh is common. Add 10% to screened BP. I believe this is known as green mix (unsure, please correct).

I think what dagabu meant to say was, mix 75% of comp and 25% BP for your first layer of prime, next 50%-50% comp to BP, then 75%-25% comp to BP, then finish with 100% BP. Which makes me think are there chlorates in your formula?(possible safety issue)
75:15:10

#7 Karlos

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Posted 13 December 2012 - 10:17 AM

If you add colored composition to the mix with BP as intermediate prime, it is waste with coloring agents and chlorine donors! It is no proffesional.
Every colored or metalic composition which is hard to ignite, can be ignite by strong hot perchlorate copmosition etc. : 74 KP 12 red gum 9 charcoal 5% dextrin or variant with aluminum 74 KP 12 red gum 6 charcoal 3 aluminum(spherical, dark) 5 dextrin. Every white silver wave type composition which I tested, was succesfull ignited by these mixtures. Compositions with bad ignitability may be poorly designed. Metalic Al stars(white, Siver waves) need 5% red gum for good burning and ignitability.

#8 AirCowPeacock

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Posted 13 December 2012 - 07:24 PM

I step prime with 60:40 star-comp:BP then 90:10 star-comp:BP then 100% BP

#9 AirCowPeacock

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Posted 13 December 2012 - 07:30 PM

Also, for some things I use:
Potassium perchlorate 40%
Potassium nitrate 30%
Charcoal 14%
Red Gum 10%
Dextrin 6%
Silicon +5%

It works as changing relay and as hot prime, it can be ignited by BP (and TT, and just about anything else.)

#10 Potassiumchlorate

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Posted 14 December 2012 - 02:41 AM

Bleser hotprime with silicon seems to be good. It's very similar to pinball prime, except that there is more red gum than charcoal in it:

Potassium perchlorate 70
Red gum 12
Charcoal, airfloat 9
Silicon 5
Dextrin 4
"This salt, formerly called hyperoxymuriate of potassa, is used for sundry preparations, and especially for experimental fire-works." Dr. James Cutbush

Conflo, ergo sum




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