Description
Test tubes 20 ml cylindrical with screw cap are polystyrene (PS) laboratory vessels for sample handling, temporary storage and routine analytical work. Each tube offers a 20 ml working volume in a straight cylindrical body measuring 16 x 150 mm, a format that fits common racks and supports clear visual inspection of fill level and sample appearance. The screw closure helps keep contents secure during bench transfer, short holding periods and movement between work areas. Supplied in packs of 500 pieces, these tubes from manufacturer Witeg suit high-throughput clinical, research, teaching and quality-control environments where disposable plasticware is preferred to reusable glass. The rigid, transparent PS wall is practical for general aqueous samples and many everyday laboratory procedures, while the cylindrical profile simplifies labelling along the shaft and organised placement in multi-sample runs. Consistent dimensions support standardised workflows in diagnostic prep, environmental testing and industrial sampling stations. Single-use construction reduces washing cycles and lowers carry-over risk between successive samples in busy laboratories that require reliable, ready-to-use tubes without glass breakage concerns.
This article is part of Test tubes, in Tubes & vials.
Key features
- Pack size: 500 pc(s)
- Material: Polystyrene (PS)
- Volume: 20 ml
- Dimensions: 16 x 150 mm
- Shape: Cylindrical
- Closure: Screw cap
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Questions about Test tubes 20ml cylindrical screw cap
What is this article?
Test tubes 20ml cylindrical screw cap is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Test tubes, inside Tubes & vials, in Labware.
A test tube is the open cylindrical vessel for a small liquid, in borosilicate glass or in plastic. Rimmed and rimless mouths differ. The size is diameter by length. It is not graduated for a result, and a glass tube that will be centrifuged has a force limit.
A tube holds a small sample upright. A test tube is the open glass or plastic cylinder. A centrifuge tube is conical so a pellet forms at the tip, and it is rated for a centrifugal force the rotor will actually reach. A vial is a small closed bottle, often for a sample that will sit in an instrument. NMR tubes are a special case: the glass has to be uniform or the spectrum is the tube, not the sample. Laboratory ware is listed under ISO laboratory glassware.
Which category should I open next?
The category is Tubes & vials. The sub-category is Test tubes. The catalogue is Labware.
Shelves beside this one are Centrifuge tubes (conical), Sample vials & NMR tubes and Tube & vial accessories.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
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Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.