{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "borosilicate-test-tubes",
 "name": "Borosilicate test tubes, 10×75 to 30×200 mm",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "What are standard test tube sizes and wall thickness?",
 "tags": [
  "test tube",
  "glass",
  "borosilicate",
  "cylinder",
  "lab",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "test tube dimensions",
  "16x150 test tube",
  "test tube sizes mm",
  "25x150 test tube",
  "glass tube stirling engine",
  "borosilicate tube od"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
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 "sheet_txt": "https://xemstudio.com/objects/borosilicate-test-tubes/sheet.txt",
 "sheet": {
  "basis": "Common laboratory sizes (OD × length), round bottom, rimless; wall 0.8–1.2 mm depending on size and maker",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "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."
  ],
  "table": {
   "columns": [
    "size",
    "od_mm",
    "length_mm",
    "wall_mm",
    "id_mm"
   ],
   "rows": [
    [
     "10 × 75",
     10,
     75,
     1,
     8
    ],
    [
     "12 × 75",
     12,
     75,
     1,
     10
    ],
    [
     "13 × 100",
     13,
     100,
     1,
     11
    ],
    [
     "16 × 100",
     16,
     100,
     1,
     14
    ],
    [
     "16 × 125",
     16,
     125,
     1,
     14
    ],
    [
     "16 × 150",
     16,
     150,
     1,
     14
    ],
    [
     "18 × 150",
     18,
     150,
     1,
     16
    ],
    [
     "20 × 150",
     20,
     150,
     1,
     18
    ],
    [
     "25 × 150",
     25,
     150,
     1.2,
     22.6
    ],
    [
     "25 × 200",
     25,
     200,
     1.2,
     22.6
    ],
    [
     "30 × 200",
     30,
     200,
     1.2,
     27.6
    ]
   ]
  }
 },
 "sheet_text": "Borosilicate test tubes, 10×75 to 30×200 mm — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/borosilicate-test-tubes/  (CC BY 4.0)\nBasis: Common laboratory sizes (OD × length), round bottom, rimless; wall 0.8–1.2 mm depending on size and maker\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n- 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.\n- 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.\n\nsize  od_mm  length_mm  wall_mm  id_mm\n10 × 75  10  75  1.0  8.0\n12 × 75  12  75  1.0  10.0\n13 × 100  13  100  1.0  11.0\n16 × 100  16  100  1.0  14.0\n16 × 125  16  125  1.0  14.0\n16 × 150  16  150  1.0  14.0\n18 × 150  18  150  1.0  16.0\n20 × 150  20  150  1.0  18.0\n25 × 150  25  150  1.2  22.6\n25 × 200  25  200  1.2  22.6\n30 × 200  30  200  1.2  27.6\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Test tube — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Test_tube\n- Pyrex / Corning: Pyrex reusable test tubes, rimless (sizes) — web — Corning site terms [verify license at link] — https://www.corning.com/worldwide/en/products/life-sciences/products/glassware/pyrex-tubes.html\n- Long Earth Society: Engine builds that use these parts (videos and write-ups) — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 11 parts): https://xemstudio.com/files/hardware/borosilicate-test-tubes/index.json\nAPI: https://xemstudio.com/api/geometry?object=borosilicate-test-tubes\n",
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   "publisher": "Wikipedia",
   "title": "Test tube",
   "url": "https://en.wikipedia.org/wiki/Test_tube",
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   "publisher": "Pyrex / Corning",
   "title": "Pyrex reusable test tubes, rimless (sizes)",
   "url": "https://www.corning.com/worldwide/en/products/life-sciences/products/glassware/pyrex-tubes.html",
   "formats": [
    "web"
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   "license": "Corning site terms",
   "license_verified": false,
   "hosted": false
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  {
   "publisher": "Long Earth Society",
   "title": "Engine builds that use these parts (videos and write-ups)",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
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   "license": "LES site",
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 "related": [
  "tri-clamp-spool",
  "copper-pipe-type-l-m",
  "o-rings-metric",
  "crank-conrod-flywheel-kit"
 ],
 "faq": [
  {
   "q": "What are the dimensions of a 16x150 test tube?",
   "a": "16 mm OD, 150 mm long, about 1.0 mm wall (14 mm ID), round bottom; it holds about 25 mL."
  },
  {
   "q": "What test tube works as a Stirling engine cylinder?",
   "a": "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."
  },
  {
   "q": "How much does test tube OD vary?",
   "a": "About ±0.5 mm between makers; design holders with 0.5 mm clearance and a silicone or felt liner."
  }
 ],
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