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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.
高级
An hour per flask, plus annealing
说明
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.
此步骤所需材料：
玻璃管套件1 个所需工具：
台式玻璃吹制喷灯
安全眼镜
耐热手套2
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.
所需工具：
台式玻璃吹制喷灯
6 英寸数显卡尺安全眼镜3
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.
所需工具：
台式玻璃吹制喷灯耐热手套4
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.
所需工具：
金刚石划针台式玻璃吹制喷灯
Jacks（玻璃工钳）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.
此步骤所需材料：
水1 升所需工具：
窑炉
量筒金刚石划针6
6
Bulb size for a volume
Bulb size for a volume
正在加载 Jupyter 笔记本…
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.
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