Description
Test tube 20 x 150 mm thread 18 is a round-bottom laboratory tube fabricated from borosilicate glass 3.3 and fitted with a white frosted writing area plus a screw cap that incorporates a Butyl/PTFE seal. With overall dimensions of 150 × 20 mm and a thread size of 18, the tube offers ample volume for sample collection, incubation, and moderate-scale reaction work. The durable glass body resists thermal and chemical stress typical of routine laboratory environments, while the gasketed screw closure ensures a tight seal during storage or transport. Supplied in packs of 50 pieces, these tubes from manufacturer Witeg are practical for laboratories that require larger-format glassware without sacrificing labelling convenience. The matt white shield accepts standard laboratory markers, supporting clear sample identification throughout multi-step workflows. Suitable for chemistry, life-science, and medical applications, the tubes combine standardised geometry with reliable sealing performance for everyday analytical and preparative tasks.
This article is part of Test tubes, in Tubes & vials.
Key features
- Pack size: 50 pc(s)
- Dimensions: 150 x 20 mm
- Thread: 18
- Material: Borosilicate glass 3.3
- Bottom shape: Round bottom
- Cap seal: Butyl/PTFE gasket
Recently viewed
You may also like
Questions about Test tubes, round bottom, white marking
What is this article?
Test tubes, round bottom, white marking 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.
How does ordering and shipping work?
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.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.