Jump to content


Photo
- - - - -

Peret's BP-Silicon Prime


  • Please log in to reply
7 replies to this topic

#1 AzoMittle

AzoMittle

    Pyrotechnician

  • Donator
  • PipPipPipPip
  • 413 posts
  • Gender:Not Telling
  • Interests:Bicycling, Algorithms/Data Structures, & Food

Posted 23 June 2016 - 01:25 AM

Name of composition: BP Prime
Creator: Peret

The Composition:

40...Potassium Nitrate (Milled)

40...Silicon (Not Milled)

20...Black Powder (Milled)

Dextrin as needed

 

Or, given directly:

 

55...Potassium Nitrate

40...Silicon

03...Charcoal

02...Sulfur

Dextrin as needed

Precedure/Preparation:

 

It doesn't need milling but the ingredients should be fine powders.

 

I pre-mill all my nitrate and perc oxidizers to flour before I use them for anything, so my version of the prime above uses 20% ball milled BP, 40% ball milled KNO3 and 40% silicon out of the bag. I never tried making a green mix prime with crystalline KNO3. However, theoretically all you need is for the prime to take fire instantly from the burst - it doesn't have to burn very fast, and indeed it won't with all that silicon. I had 100% success with the silicon prime this year, reliably lighting the difficult barium nitrate stars that blew blind in the past, though looking at the videos, those stars don't actually start to burn until they're some distance from the center of the break.

 

--- http://www.amateurpy...ime/#entry84656

 


Terminat hora diem; Terminat author opus.
The hour ends the day; The author ends his work.
 
Oh lente lente noctis equi!
Slowly, slowly run oh horses of the night!
 
Perfection does not exist, but that does not mean you cannot work constantly to attain it.
 
The really important kind of freedom involves attention, and awareness, and discipline, and effort, and being able truly to care about other people and to sacrifice for them, over and over, in myriad petty little unsexy ways, every day. . . . The only thing that's capital-T True is that you get to decide how you're going to try to see it. You get to consciously decide what has meaning and what doesn't. . . . The trick is keeping the truth up-front in daily consciousness. -David Foster Wallace


#2 BengalFlair

BengalFlair

    Pyromaniac

  • Full Member
  • PipPipPip
  • 115 posts
  • Gender:Male
  • Location:India
  • Interests:Pyrotechnics

Posted 23 June 2016 - 02:48 AM

I think Peret is not the creator of this prime.The actual prime composition is in "PYROTECHNICS" by Alexander P. Hardt which is as follows-

Potassium nitrate--38

Silicon--38

Meal D--19

dextrin--5

 

Peret just modified it a bit.


  • AzoMittle likes this

#3 dagabu

dagabu

    Grandmaster

  • Donator
  • PipPipPipPipPipPipPipPipPipPip
  • 8,779 posts
  • Gender:Male
  • Location:Up Nort

Posted 24 June 2016 - 09:53 AM

I think Peret is not the creator of this prime.The actual prime composition is in "PYROTECHNICS" by Alexander P. Hardt which is as follows-

Potassium nitrate--38

Silicon--38

Meal D--19

dextrin--5

 

Peret just modified it a bit.

 

Then it becomes his version.  I don't think Hardt came up with the prime either but a variant. 


Dave
 
PGI Member http://www.pgi.org
IPA Member http://www.iowapyro.com
 
"The art of fire is indeed the supreme art; for fire is at once the universal slave, the universal master."

#4 Mumbles

Mumbles

    Grandmaster

  • Admin
  • PipPipPipPipPipPipPipPipPipPip
  • 11,606 posts
  • Gender:Male
  • Location:Above You

Posted 24 June 2016 - 10:15 AM

Nope, neither Hardt nor Peret came up with this composition.  38:38:19:5 is the exact same as 40:40:20 +5 dextrin to within a tenth of a percent for what it's worth, no modification.  I got this formula 10 years ago from someone who's had it since probably the mid 80's to early 90's, and he certainly wasn't the innovator either.  I don't know who actually created it, but I had it labeled as "English hot prime".  

 

In any case, this is a supremely hot prime.  If it doesn't light your composition, I'm not sure anything will.


Just so you guys quit asking, here is the link to the old forum. http://www.xsorbit2....forum/index.cgi

The sky is my canvas, and I have 2,113 pounds of powdered paint in the workshop.

#5 BengalFlair

BengalFlair

    Pyromaniac

  • Full Member
  • PipPipPip
  • 115 posts
  • Gender:Male
  • Location:India
  • Interests:Pyrotechnics

Posted 24 June 2016 - 01:20 PM

I do use this prime and agree that practically there is no difference between 38:38:19:5 and 40:40:20 +5 dextrin.

But when I got this prime composition as 38:38:19:5, I didn’t have any digital balance and only had some 100, 50, 20,10 and 5 gram weights. So I MODIFIED the composition by rounding  up the numerical values as 40:40:20 +5 dextrin to weigh it easily.

I think Peret might think so ...as...Wise men think alike :D 


  • OldMarine likes this

#6 dangerousamateur

dangerousamateur

    Pyrotechnician

  • Full Member
  • PipPipPipPip
  • 398 posts

Posted 25 June 2016 - 12:50 PM

How does this compare to the much more expensive perchlorate primes?

 

Does silicone make any trouble when wetted with nitrate?



#7 DonCopal

DonCopal

    Pyromaniac

  • Full Member
  • PipPipPip
  • 56 posts

Posted 07 December 2016 - 02:47 PM

Does the prime require an additional outer prime to ignite reliably?



#8 Arthur

Arthur

    Firebreather

  • HE Qualified
  • PipPipPipPipPip
  • 3,229 posts

Posted 10 December 2016 - 10:00 AM

I've seen this prime quoted as BP +5% Si, unmilled BP ingredients +5% Si and lots of other variants. It really only depends on the fact that burned Silicon is Silica which is a liquid as created so as the liquid cools to solid slag it gives out a lot of heat to the material in contact (the star) rather than spreading hot gas into the atmosphere.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users