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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.
Advanced
An hour per beaker, plus annealing
Instructions
1
1
Cut a length of tube
Cut a length of tube
Choose wide borosilicate tube and score and snap a length a little more than 1.4 times its diameter.
Materials for this step:
Glass Tubing Kit1 pieceTools needed:
Diamond Scriber
Digital Caliper 6-Inch
Safety Glasses2
2
Close the bottom flat
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.
Tools needed:
Bench Glassblowing Torch
Tweezers (Laboratory)Safety Glasses
Heat-Resistant Gloves3
3
Flare the rim, pull a lip
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.
Tools needed:
Bench Glassblowing Torch
JacksSafety GlassesHeat-Resistant Gloves4
4
Anneal
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.
Tools needed:
KilnHeat-Resistant Gloves5
5
Mark the volumes
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.
Materials for this step:
Water1 literTools needed:
Measuring CylinderDiamond Scriber6
6
Griffin proportions
Griffin proportions
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7
7
Limits
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.
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