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Round-Bottom and Florence Flasks Blown from Glass Tube
A round-bottom flask is a glass sphere on a tubular neck: the round shape heats evenly and stands up to vacuum, so it is the flask for boiling and distilling. Blow it from the end of a borosilicate tube; flatten the bottom while soft and it becomes a Florence flask that stands on the bench.
The picture: our diagram of the steps, from tube to round-bottom and Florence flask.
Osezingeni eliphezulu
An hour per flask, plus annealing
Imiyalelo
1
1
Close and gather
Close and gather
Close one end of the tube in the flame as for a test tube. Keep heating and turning the closed end, pushing gently, so glass gathers into a thick knob for the bulb.
Izinto zokwakha zalesi sinyathelo:
Isethi Yemibhobho Yengilazi1 ucezuAmathuluzi adingekayo:
Isibani sokuphephetha ingilazi sasetafuleni
Izibuko zokuphepha
Amagilavu Amelana Nokushisa2
2
Blow the bulb
Blow the bulb
Take the gather out of the flame and blow gently into the open end while turning, so the bulb grows round. Reheat and blow again until it is the size you want.
Amathuluzi adingekayo:
Isibani sokuphephetha ingilazi sasetafuleni
I-Caliper Yedijithali Yamayintshi Ayi-6Izibuko zokuphepha3
3
Flat bottom for a Florence flask
Flat bottom for a Florence flask
For a flask that stands, soften the bottom of the bulb and press it gently on a flat plate.
Amathuluzi adingekayo:
Isibani sokuphephetha ingilazi sasetafuleniAmagilavu Amelana Nokushisa4
4
Cut and finish the neck
Cut and finish the neck
Score and snap the tube to neck length, fire the edge smooth and flare it a little with the jacks so a stopper or joint fits.
Amathuluzi adingekayo:
Isibhoboza SedayimaneIsibani sokuphephetha ingilazi sasetafuleni
Jacks (udlawu lwabakhi bengilazi)5
5
Anneal and check
Anneal and check
Anneal in the kiln at the glass's annealing temperature and cool slowly. Fill with measured water to find and mark the volume. Stand round flasks in a cork ring.
Izinto zokwakha zalesi sinyathelo:
Amanzi1 ilithaAmathuluzi adingekayo:
Isithando
Isilinda sokukalaIsibhoboza Sedayimane6
6
Bulb size for a volume
Bulb size for a volume
Ilayisha incwadi ye-Jupyter…
7
7
Limits
Limits
The flask's form and why it is round are from Wikipedia; the blowing is our lampwork practice. Heat only borosilicate flasks, and never boil in a flask with a scratched or unannealed wall.
Amathuluzi Adingekayo
8- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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