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Had a Slow day just made some circlips to hold the gudgeon pins in the pistons for a 3 cylinder radial

Piston.jpeg
 
Progress on my Scratch build 1/6th scale Miss Severn/APBA Runabout. Mahony planks install.
 

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Just been reading a scary DATA SHEET For BRAZING FLUX. (Flux 4).
It contains Potassium bifluoride...
The safety data sheet said it was for use in machines (presumably with suitable fume extraction and processing?) and highly toxic.
Yet sold on 3&@y as about the cheapest available for copper, jewellery, etc. silver soldering.
Now I appreciate modellers etc. are a sensible bunch and don't breath toxic fumes, Or at least I assume the surviving readers don't... except maybe the smokers...
But considering the toxicity of the flux and fumes, I am a bit surprised that is freely available and the cheapest on the market?
But maybe that particular brand isn't any worse than other manufacturers' flux of different formulation?
All that bothered me was the instructions to wear total skin eye and breathing protection.... because skin contact, eye contact, and breathing Fluoride fumes causes permanent damage... and can kill?
I shall be MORE careful in future when silver soldering, as the brand I use also contains some nasty stuff that can create Hydrogen Fluoride fumes, etc.:(
But it is not carcinogenic... :)
(Have to look on the bright side!) ;)
Back to fixing my boiler today...
Yesterday I gave it an hydraulic test and a very fine jet of water exited a microscopic hole in the silver solder... I couldn't see it with a jewellers' loupe. I just spotted a damp patch appearing on a surface 2 ft away! (after feeling some wetness on my hand passing around the boiler). The jet of water was fine like a hair... It proved the necessity of the hydraulic test, as it didn't leak until just about NWP... But leaked well at 2 x NWP. - Perhaps there was a fine particle of Muck in the soldered joint?
Otherwise all OK... But watch this space...
K2
 
Just been reading a scary DATA SHEET For BRAZING FLUX. (Flux 4).
It contains Potassium bifluoride...
Teflon (your frying pan) also contains fluorine and if you leave it on the stove empty on HIGH will start fuming it in a short time, and many many other products contain it like Gortex (your jacket), and even non-stick pizza box lining paper. toxic is everywhere, the irony of "better living through chemistry!", its scary :-( !!!
 
Apparently birds (such as pet canaries or parrots) can be killed by fumes from overheated Teflon pans. Not having either a bird in the house or any non-stick pans (except old well seasoned cast iron), I can't verify this personally, but it makes me wary of heating anything containing Teflon.
 
hi folks: as a veterinarian who has worked with birds for 40 odd years, we frequently see dead/dying small birds like budgies and cockatiels with severe respiratory distress after someone has burned a teflon frying pan, which releases PTFE fumes which are toxic to respiratory epithelium, so my advice is avoid teflon and high heat. When your pan starts to flake off a blackish residue, or any time you can see bare metal shining through the black coating, the coating has degraded, and you are ingesting little bits of this and volatilising them during cooking/heating, so its a good time to discard it and get a new one. Regular cooking temperature on intact surfaces seems Ok with relatively little PTFE release.
cheers Chris
 
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