Xem Studiomeasured geometryLibrary › Hardware › Stirling & thermoacoustic ·
Borosilicate test tubes, 10×75 to 30×200 mm
What are standard test tube sizes and wall thickness? · Hardware · basis: Common laboratory sizes (OD × length), round bottom, rimless; wall 0.8–1.2 mm depending on size and maker
Long Earth Society build part. Displacer cylinders for the LES low-temperature demonstrators. The engines · all LES parts
- sizes
- 11 in table
Notes
- Sizes are OD × length in mm: 10×75, 12×75, 13×100, 16×100, 16×125, 16×150 (the classic), 18×150, 20×150, 25×150, 25×200, 30×200. OD tolerance about ±0.5 mm, so measure before a press fit.
- Wall: about 1.0 mm up to 20 mm OD, 1.2 mm for 25–30. Rimmed versions add a 1.5 mm flare at the mouth.
- Why it's here: a 20×150 or 25×150 borosilicate tube is the displacer cylinder of a low-temperature Stirling / thermoacoustic demonstrator; it survives a 300 °C hot end and lets you watch the displacer. Mount in a silicone-lined printed collar at OD + 0.5 mm.
Sizes
| size | od_mm | length_mm | wall_mm | id_mm |
|---|---|---|---|---|
| 10 × 75 | 10 | 75 | 1.0 | 8.0 |
| 12 × 75 | 12 | 75 | 1.0 | 10.0 |
| 13 × 100 | 13 | 100 | 1.0 | 11.0 |
| 16 × 100 | 16 | 100 | 1.0 | 14.0 |
| 16 × 125 | 16 | 125 | 1.0 | 14.0 |
| 16 × 150 | 16 | 150 | 1.0 | 14.0 |
| 18 × 150 | 18 | 150 | 1.0 | 16.0 |
| 20 × 150 | 20 | 150 | 1.0 | 18.0 |
| 25 × 150 | 25 | 150 | 1.2 | 22.6 |
| 25 × 200 | 25 | 200 | 1.2 | 22.6 |
| 30 × 200 | 30 | 200 | 1.2 | 27.6 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Test tube | web | CC BY-SA 4.0 (text) |
| Pyrex / Corning | Pyrex reusable test tubes, rimless (sizes) | web | Corning site terms verify |
| Long Earth Society | Engine builds that use these parts (videos and write-ups) | web, video | LES site |
Free files
★ Free files 11 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| test-tube-10x75 | Ø10 × 75 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
| test-tube-12x75 | Ø12 × 75 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
| test-tube-13x100 | Ø13 × 100 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
| test-tube-16x100 | Ø16 × 100 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
| test-tube-16x125 | Ø16 × 125 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
| test-tube-16x150 | Ø16 × 150 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
| test-tube-18x150 | Ø18 × 150 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
| test-tube-20x150 | Ø20 × 150 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
| test-tube-25x150 | Ø25 × 150 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
| test-tube-25x200 | Ø25 × 200 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
| test-tube-30x200 | Ø30 × 200 round-bottom, 1.0 mm wall (nominal) | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=borosilicate-test-tubes
Fits with
Questions
What are the dimensions of a 16x150 test tube?
16 mm OD, 150 mm long, about 1.0 mm wall (14 mm ID), round bottom; it holds about 25 mL.
What test tube works as a Stirling engine cylinder?
20×150 or 25×150 borosilicate (not soda-lime): the hot end takes a flame, the glass shows the displacer, and a printed collar at OD + 0.5 mm holds the cold end.
How much does test tube OD vary?
About ±0.5 mm between makers; design holders with 0.5 mm clearance and a silicone or felt liner.