Thank you for explaining 😁

What’s was it like back In the 70’s working scientific? Where people open with knowledge or did everyone keep to them self and not share information and techniques?

Aaaww, love you too Isshogai xx

Haha woops! I hope it wasn't too complicated! Many thanks xxx

But at least you don't have to worry about thermal stress... : )

Do welding masks melt or transmit too much heat for this kind of work?

@@Kenionatus they Will melt im sure,sometimes im blowing 110mm Glass wallthickness 5mm,thats why i asked :)

While I'm not Natalie I'll drop my twopence here anyway ;-) Generally speaking, the biggest obstacle to joining two different types of glass is the difference in their respective thermal coefficients. Too big, and try as you may, the joint will always crack. Quartz glass has an extremely low thermal coefficient, so low that it won't crack even if you put it, red hot, straight into water. Uncle Google says: _"Borosilicate glasses are known for having very low coefficients of thermal expansion (∼5 × 10^−6/ °C at 20 °C)"_ - low FOR A GLASS, that is - which is still pretty high "generally speaking". _"One of the most attractive features of quartz glass is its very low thermal coefficient of expansion (CTE). The average CTE value for quartz glass at about 5.0 × 10^ -7/ °C is many times lower than that of other common materials"_ So it looks like the CET of borosilicate glass is TEN TIMES higher than that of quartz glass, thus "I doubt it very much". Then there's a huge difference in melting (softening) temperature: 820°C vs 1670°C, so when you touch softened borosilicate element to softened quartz glass, the former will probably just melt completely and drip down as a rather runny liquid.

@@MrKotBonifacy thanks !

Suuuuuuper high heat reactions. The strain point of quartz is 1120C, so you could safely use this in reactions up to at least 925C as many times as you want without worry of failure. Borosilicate strain point is only 515C for comparison. My educated guess on the long neck is for the purpose of keeping that insane heat away from the rest of the apparatus. Glass is insulating, so it would take a long time for the heat to travel up the neck and apparatus. This is a very purpose built item, so I can't speak to a specific reaction. I mean the flask is on a very tiny scale and that looks like a 10mm joint, which is also super tiny. I'd venture a strong guess toward research or analytics rather than production.

It is for Ketene synthesis. She stated the use in the name (although I am not used to the spelling, but that might just be a region thing) the legend Doug's Lab made 2 videos about a similar process these would typically be used for. kzfaq.info/get/bejne/lZedgLpj1quqaGg.html

Thank you. Yeah it's a b****rd to work with! We don't actually have an oven that can handle annealing quartz, so I warm it through by hand as we go. It's annoying when those white patches appear, but I just heat the glass til it's glowing but not yet soft, and that gets rid of them alright xx

@@Celebnariel bird? bitch? :D Yeah, I can imagine working with quarts to be hard, I didn't even know it can be hand blown, like you do it in the video. Hard work. Take care of protecting your skin and eyes, even on small jobs.

We call it smoke. Basically take a torch to it, as if polishing, but move the fire a bit quicker while going over the smoke

@@gokugohan9000 get a fat flame on a double cone

Some other viewer, MrEurypterid, commented on this "fogging": _"I believe the white bloom is condensed silicon monoxide, the working temperature being so high that the silica vaporises, partially dissociates and condenses onto the comparatively cooler parts. A gentle reheat, as you say, restores it to the dioxide, which then dissolves back into the bulk."_

Maybe people don’t wanna make nick nacks..

Air from my lungs 😂

@@Celebnariel what torch and gas are you using?