Caplugs® Evergreen 21 mL Round Bottom Test Tubes, Polystyrene, 16 x 150 mm, Natural, 1000/Bag
These 21 mL Round Bottom Test Tubes are molded from clear polystyrene in a standard 16 x 150 mm format, giving labs an economical, single-use vessel for sample collection, reagent dispensing, and routine clinical and microbiology workflows. Natural-clarity PS walls support easy visual inspection of liquid levels and turbidity, while the round bottom suits standard rack and centrifuge adapter setups.
Technical Specifications
| Product Type | Round Bottom Test Tubes |
|---|---|
| Volume/Size | 21 mL, 16 x 150 mm |
| Material | Polystyrene (PS) |
| Color | Natural |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| Country of Origin | USA |
Applications
- Routine sample collection and aliquoting in clinical and research labs
- Reagent and buffer dispensing where single-use disposables reduce cross-contamination
- Microbiology dilution series and broth handling
- Optical density and turbidity checks through clear PS walls
- Specimen transport within standard 16 mm tube racks
- General benchtop mixing and short-term sample holding
Quality & Procurement
labsupplies.com is an authorized Caplugs® Evergreen dealer shipping from US inventory, and these tubes are Made in USA. Each bag carries lot numbers to support traceability for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available for high-volume and recurring procurement.
Frequently Asked Questions
Are these test tubes sterile?
No. These tubes ship non-sterile, which suits general reagent handling, dilutions, and non-critical sample work. For aseptic applications, sterilize compatibly with polystyrene or select a pre-sterilized product.
Can polystyrene tubes be autoclaved?
No. Polystyrene is not autoclavable and will deform under standard steam cycles. These tubes are intended as economical single-use disposables for non-sterile workflows.
What are the exact dimensions of each tube?
Each tube measures 16 x 150 mm with a round bottom and a working capacity of 21 mL, fitting standard 16 mm racks and tube holders.
How many tubes are in a pack, and how is pricing structured?
Each unit is sold as 1000/Bag, and the listed price is per pack. Institutional and grant-funded tiered pricing is available for larger orders.