AP stars

[24pyro97]

I've never made stars using ammonium perchlorate but i want to try try a formula for a blue as its said to give the best blues. as far a priming i know using potassium nitrate primes may cause drying issues. I want to use the AM Perc and benzoate star formula and want to know if anyone has had issues with this comps ignition or any other insight into the formula like priming used etc.

[Carbon796]

https://www.amateurpyro.com/forums/topic/14184-nc-lacquer-nitrocellulose-lacquer/?do=findComment&comment=193333

[nordicwolf]

I need to get some ammonium perchlorate. I found 3 sizes available.

 

What is a good size for AP stars?

 

What is a good size for use in a fountain mix?

 

90 micron (~170 mesh)

200 micron (~70 mesh)

400 micron (40 mesh)

Thank you

[SharkWhisperer]

 

I need to get some ammonium perchlorate. I found 3 sizes available.

 

What is a good size for AP stars?

 

What is a good size for use in a fountain mix?

 

90 micron (~170 mesh)

200 micron (~70 mesh)

400 micron (40 mesh)

Thank you

 

Get the finest you can...90 micron. The varied sizing is for APCP propellant grain formulation where you modify fuel performance using a combination of different oxidizer sizes.

 

For gerbs and stars you want the finest powder you can acquire. If you happened to purchase the huge 400 micron particles (think the size of very large grains of sand), you'd probably find yourself needing to waste time making it finer to get maximum utility, so just start with the 90um...

[ZavodKirova]

I do not recommend using copper benzoate. Because it does not give such color saturation. The best blue color is obtained on copper rhodanide, but rhodanide is a very effective AP catalyst, stars will burn very quickly. Most copper salts are catalysts for AP. The best option is to use copper oxide.

[dave321]

copper rhodanide = copper thiocyanate

 

is that correct?

[ZavodKirova]

copper rhodanide = copper thiocyanate

 

is that correct?

Yes.