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Borosilicate Beakers Made from Wide Glass Tube

Jeffrey M. Vinocur (Wikimedia Commons) · CC BY 2.5

作成者

Bubbles

14. 10月 2026

Borosilicate Beakers Made from Wide Glass Tube

A beaker is a glass cylinder with a flat bottom and a small pouring lip; the usual low form, devised by John Joseph Griffin, is about 1.4 times as tall as it is wide. Made from wide borosilicate tube, it takes the heat of a flame or hot plate: close one end flat, open and lip the other, anneal, and mark the volumes. The picture: a small low-form beaker with its pouring lip and volume marks.

上級者

An hour per beaker, plus annealing

手順

Cut a length of tube

Choose wide borosilicate tube and score and snap a length a little more than 1.4 times its diameter.

このステップの材料:

ガラス管キット1 個

必要な工具:

ダイヤモンドけがき針

デジタルノギス 6インチ

保護めがね

Close the bottom flat

Turn one end in the flame until soft, pull off the end to close it as for a test tube, then heat the closed end and press it flat on a graphite or steel plate, turning, until it stands level.

必要な工具:

卓上ガラス吹きバーナー

ピンセット（実験用）

保護めがね

耐熱手袋

Flare the rim, pull a lip

Heat the open end and flare it slightly with the jacks so the rim is thickened and smooth. Heat one spot of the rim and push it out with a pointed tool to form the pouring lip.

必要な工具:

卓上ガラス吹きバーナー

Jacks（ガラス職人のジャックス）

保護めがね

耐熱手袋

Anneal

Put the hot beaker straight into a kiln held at the glass's annealing temperature, soak it, and let it cool slowly so no strain is left.

必要な工具:

窯

耐熱手袋

Mark the volumes

Pour in measured water from a measuring cylinder a step at a time and scratch a line at each level with the diamond scriber.

このステップの材料:

水1 リットル

必要な工具:

メスシリンダー

ダイヤモンドけがき針

Griffin proportions

Jupyter ノートブックを読み込み中…

Limits

The shape and proportions are as Wikipedia gives them; the working steps are our lampwork practice. Only borosilicate takes heating; an unannealed beaker can crack on its own.