Anyone know where carbon black is sold? So far, all I've found is Google's Chinese advertizers and some that's been treated for pigment use.
Hul
Anyone know where carbon black is sold? So far, all I've found is Google's Chinese advertizers and some that's been treated for pigment use.
Hul
onsdag den 27. februar 2019 kl. 22.30.44 UTC+1 skrev Hul Tytus:
google says,
Lasse Langwadt Christensen wrote in news:925dc2da- snipped-for-privacy@googlegroups.com:
Do you just want that to make an emissive surface?
Look into VantaBlack too. They have to be producing processed surfaces by now.
Purpose is to mix with, probably, polyurethane resin to make some pressure sensitive resisters. There's no concern regarding emissions, hopefully.
Hul
snipped-for-privacy@decadence.org wrote:
I'm sure you have your reasons, but just in case, force sensing resistors are readily available.
[I had been meaning to buy (what used to be) a conventional safety razor for a while, having used disposable cartridge types for years. My usual twin blade supply was discontinued, and I'm not prepared to use the replacement five blade cartridges. Five blades on something which grows continuously. Fuck that shit.When I eventually got around to it, in the course of my Googling I discovered that there were strange very long handled extra wide razors available for shaving one's back. I had never heard of (or wanted) such a thing.
So just maybe these pressure sensitive resistors are equivalent to back-shaving razors.]
Cheers
-- Clive
Carbon black is intended to be used as a pigment.
You should be able to buy it in small amounts from anyone that sells hobby plastic casting resins - eg. Amazon. You may actually want graphite dust judging by your intended use further down the thread.
You could make your own from a 3B pencil in that case or from crushed charcoal if you don't really care about reproducibility.
-- Regards, Martin Brown
Graphite powder is sold as a lubricant for locks. Try that.
Back in the day we used aquadag as a thermal IR absorber.. it's water based and not a 'hard' coating.
I see nothing online that isn't way too spendy,
George H.
For carbon-microphone type sensors, graphite is what you'd want; carbon black is buckyballs, has very different electric conduction.
Rather than mixing with liquid resin, one usually wants to sinter a powder mix: the urethane might cure/outgas/age poorly, and that means sensor drift.
Clifford Heath wrote in news:X_EdE.20690$ snipped-for-privacy@fx38.iad:
Silvery and viscous like slick. Not black, but perhaps a good choice for this app, since it is conductive. I guess it depends if the individual particles meld/glom together.
Cement black colouring powder is carbon black IIRC. Pencils are graphite and clay and who knows what else. Might work for you. Charcoal briquettes are mostly nonconductive.
NT
if you only want a tiny amount of C, a candle flame on a cold surface can deliver.
NT
For a small experiment is there nothing like this on offer in the US?
Price per gram is ludicrous really but a little goes a long way.
BTW OP should beware of handling TDI if they intend to make their own flexible PU foam as it is a quite serious respiratory sensitiser.
They may be better off seeing if antistatic foam will do what they want.
-- Regards, Martin Brown
You can find "milled carbon fiber powder conductive" on Ali in
50um/75um/150um/300um for around $50-65/1 kg. USD.--Spehro Pefhany
I'll try looking for "graphite powder". That may work better on Google's.
Hul
Clifford Heath wrote:
A candle might work but it'd be hyper slow even for ounces.
Hul
snipped-for-privacy@gmail.com wrote:
Martin - carbon black sold as a pigment is usually treated to diffuse in paints or resins. Unfortunantly, that treatment renders the powder nonconductive.
Hul
Mart> > > >> Anyone know where carbon black is sold? So far, all I've found is
Thanks Spehro. I'll take a look.
Hul
speff wrote:
If you want volume:
John :-#)#
it's more for milligrams
NT
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