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Round-Bottom and Florence Flasks Blown from Glass Tube

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Bubbles

14. 10월 2026

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.

고급

An hour per flask, plus annealing

안내

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.

이 단계의 재료:

유리관 키트1 개

필요한 도구:

탁상 유리 불기 토치

보안경

내열 장갑

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.

필요한 도구:

탁상 유리 불기 토치

디지털 캘리퍼스 6인치

보안경

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.

필요한 도구:

탁상 유리 불기 토치

내열 장갑

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.

필요한 도구:

다이아몬드 금긋기 바늘

탁상 유리 불기 토치

Jacks(유리 장인의 잭스)

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.

이 단계의 재료:

물1 리터

필요한 도구:

가마(킬른)

메스실린더

다이아몬드 금긋기 바늘

Bulb size for a volume

Jupyter 노트북 불러오는 중…

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.