Cerakote

[kbillet]

Does a black Cerakote finish on a suppressor slow or retard the cooling of the suppressor? This as opposed to a glass bead finish on a Titanium suppressor.

[fishman]

Does a black Cerakote finish on a suppressor slow or retard the cooling of the suppressor? This as opposed to a glass bead finish on a Titanium suppressor.

considering that people put cerakote on exhaust headers specifically to keep heat in, ima guess yes...

[fishman]

after a little research, i found a better option than black cerakote

"Transfer Grey (Air Cure)
Item: C-187Q

Description:Charcoal grey with a soft metallic finish.

Cerakote Heat Dissipating Coatings are a line of submicron coatings with industry leading thermal conductivity. Transfer Grey is typically used on applications requiring a high thermal conductivity to transfer heat away from the energy source. Typical uses included but are not limited to radiators, engine blocks, transmission cases, heat syncs, intercoolers and anywhere heat dissipation is needed. (Air Cure)."
http://www.cerakotehightemp.com/finishe ... -air-cure/

[T-Rex]

"Transfer Grey (Air Cure) Item: C-187Q

I would email Cerakote and ask what temp this product can handle.
The items listed as examples do not see the same heat extremes that a suppressor does.
It might shed heat up to XX* and then start to bake off.

Just a thought.

[kbillet]

Talked to Cerakote. The Transfer Grey is designed to transfer heat out of the object and will withstand 1200 degrees Fahrenheit without discoloring. The High Temp Firearms coatings will withstand 1800 degrees and are intended to retain heat. So in trying to decide which coating to use the bigger question is what are you trying to do? In reading another post it indicated that the hotter the suppressor, the less efficient it was. That would lean to the choice of Transfer Grey. Thanks 'fishman" for the link and listing options. Thoughts?

[T-Rex]

Talked to Cerakote. The Transfer Grey is designed to transfer heat out of the object and will withstand 1200 degrees Fahrenheit without discoloring. The High Temp Firearms coatings will withstand 1800 degrees and are intended to retain heat. So in trying to decide which coating to use the bigger question is what are you trying to do? In reading another post it indicated that the hotter the suppressor, the less efficient it was. That would lean to the choice of Transfer Grey. Thanks 'fishman" for the link and listing options. Thoughts?

Good follow-up. Thanks

[fishman]

they also have another heat dissipating coat that is black and it is a bake cure, not an air cure.

[silencer_kid]

they also have another heat dissipating coat that is black and it is a bake cure, not an air cure.

https://www.youtube.com/watch?v=0hvvoLzMR5o#t=79

[Capt. Link.]

I used a product called GunCoat made by KG.It's a grey black high temp heat dissipating bake on finish.If applied correctly you must blast it off.It was used by the Navy for protection of the cannon.The stuff would even stay on the muzzle of the guns.I used it on my Yamaha thumper and it did help keep it cool.

[kbillet]

Thanks Capt. I'm having the current cans done with Cerakote 202 Arctic Black. Next round I will try GunCoat and do myself.

[fishman]

Thanks Capt. I'm having the current cans done with Cerakote 202 Arctic Black. Next round I will try GunCoat and do myself.

Arctic black 202 is only rated for 500 degrees Fahrenheit before discoloring, I would do the transfer gray, or one of the high temp coatings

[whiterussian1974]

V-168 Cobalt and V-167 Tungsten are other options if you just want a darker color that can handle 1800*F and transfers heat.
Maybe they could special mix in some Green or Brown if you ask. Though production lines usually aren't able to deviate for individual items. Just batch runs.

[kbillet]

Cans will be used on Bolt Rifles with relatively a slow rate of fire. I don't expect to reach that level of heat. I have read information "OUT THERE" that indicates as the temperature of the suppressor goes up it loses some suppression effectiveness. No big deal. But what is of a concern and why I am interested in thermal dissipation is the change in velocity. As the temperature builds up there is a gain in velocity with a potential change in the point of impact. Use is long range Prairie Dog hunts.

[whiterussian1974]

But what is of a concern and why I am interested in thermal dissipation is the change in velocity. As the temperature builds up there is a gain in velocity with a potential change in the point of impact. Use is long range Prairie Dog hunts.

Can heat shouldn't affect vel. Combustion is near complete in barrel, so post muzzle is treated as a local event. Less problem than traveling over a hot rock. B/c rock will cause air to rise. A hot can will only thin the air w/o causing any turbulence.

[kbillet]

Check out this link. Thoughts?
http://langhallsskytte.com/2014/01/25/p ... ppressors/

[whiterussian1974]

Re: http://langhallsskytte.com/2014/01/25/p ... ppressors/

He drew a false conclusion. It's not the CAN that causes vel variation. It's that the BARREL rifling is hotter. The can retains the heat that would otherwise jet into air, and so transmits/conducts this into barrel. Plus, the barrel bore retains hot gas longer (as desired effect of suppressor stagnation) and so more heat is retained and soaks into barrel.

His remarks about "freebore boost" are correct. The hot air w/i the can is thinner and so slows the bullet less, yet jet behind the base continues driving bullet faster.

He is also correct about periodically needing to check baffle bores. This is artifact known as "whiskering." Noted on early Apollo missions but 1st b/c problem on 1970s SkyLab. The ZeroG allowed metals to "creep" into filiments that caused short circuits. The extreme can environ also allows creep. Cans need reamed w bore brush to prevent buildup b/f and after range trips.

[whiterussian1974]

http://emptormaven.com/2007/03/freebore-boost-effects/

"If I may summarize liberally from the results of the experiment: A baffle suppressor essentially has two states, which we could call “Hot” and “Cold.” A suppressor is Hot when either (1) shots are fired in quick succession or (2) its temperature is above about 150F. In the first case I imagine that the baffles are still full of hot propellant vapor; in the second case the can is radiating enough heat to keep ambient air at this elevated temperature. A suppressor goes Cold as soon as ambient air seeps back in.

Using this equipment (16″ bbl and 6″ suppressor) the muzzle velocity out of a Hot suppressor is around 50fps higher than out of a Cold one. And if we look at the standard deviation of muzzle velocity when shooting Cold it comes out the same as when shooting Hot."

[silencer_kid]

increase in FPS is attributable to a hot barrel AND simply by screwing on a can, which affects POI.

[curtistactical]

We use Crerakote C series on all of our suppressors, it will have zero effect on suppression. You have to think guys use suppressor covers and those really do retain heat and they little to no effect on suppression. If you have a titanium tube suppressor and you get it hot enough to worry about the heat affecting suppression you are going to have bigger problems than that.

[silencer_kid]

Does a black Cerakote finish on a suppressor slow or retard the cooling of the suppressor? This as opposed to a glass bead finish on a Titanium suppressor.

there is a reason why heatsinks are black. when comparing same product the black color will dissipate more heat than the white color.

[whiterussian1974]

Black DOES radiate more heat than white. White reflects energy. But color here is mainly for aesthetics and camo preference.

OP asked if Cerakote or bead finish was better. He shouldn't have specified "black" b/c that only confused the issue.

Good that you brought color's role upon the ThermoDynamics of radiant heat.

For those interested. https://en.wikipedia.org/wiki/Black_body

[silencer_kid]

Black DOES radiate more heat than white. White reflects energy. But color here is mainly for aesthetics and camo preference.

OP asked if Cerakote or bead finish was better. He shouldn't have specified "black" b/c that only confused the issue.

Good that you brought color's role upon the ThermoDynamics of radiant heat.

For those interested. https://en.wikipedia.org/wiki/Black_body

in almost all cases black has higher emissivity than white. and in general, if it absorbs EMR better it also has better emissivity. a bead blast to give more surface area + flat black gives best cooling affect, just not sure that matters much here.

[whiterussian1974]

Black DOES radiate more heat than white. White reflects energy. But color here is mainly for aesthetics and camo preference.

OP asked if Cerakote or bead finish was better. He shouldn't have specified "black" b/c that only confused the issue.

Good that you brought color's role upon the ThermoDynamics of radiant heat.

For those interested. https://en.wikipedia.org/wiki/Black_body

WRONG.
in almost all cases black has higher emissivity than white. and in general, if it absorbs EMR better it also has better emissivity.
Stick to you day job.

What part of DOES radiate do you disagree w?
Since you couldn't understand Blackbody radiation, maybe this will help explain for you.
https://en.wikipedia.org/wiki/Stefan%E2 ... tzmann_law

[whiterussian1974]

Way to cover your tracks w editting. Didn't count on me already having your quote open in reply window, huh? :d'oh:

[silencer_kid]

Way to cover your tracks w editting. Didn't count on me already having your quote open in reply window, huh? :d'oh:

no, sorry, i misread your post, and did edit. my bad.
if you cant recognize the blunder then forums like this are not for you....... and if you want to nitpick it, you stated "White reflects energy.", which is true, but so does black, so not really sure why you even mentioned it.

and to note, the color/material does not have to absorb light to have excellent emissivity of infrared (aka heat). in this case we dont really care about visible light range. and its the reason why i said "in general". in this specific case it depends on what type of R value the cerakote material has, thus it could be black yet act as a insulator vs no coating at all.