Caplugs® Evergreen 19 mL Round Bottom Test Tubes, 16 x 125 mm, Polystyrene, Natural, 1000/Bag
The Caplugs® Evergreen 19 mL Round Bottom Test Tubes are clear polystyrene tubes molded to a 16 x 125 mm format for routine sample handling, reagent dispensing, and general bench work. Optical clarity supports visual inspection of color reactions and turbidity, while the round bottom suits mixing, decanting, and rack-based workflows in clinical and research labs.
Technical Specifications
| Product Type | Round Bottom Test Tubes |
|---|---|
| Volume/Size | 19 mL, 16 x 125 mm |
| Material | Polystyrene (PS), Natural/Clear |
| Closure/Cap | None (tubes supplied without caps) |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| Country of Origin | USA |
Applications
- Routine sample collection and aliquoting in clinical chemistry labs
- Reagent preparation, dilutions, and titration setup
- Visual colorimetric and turbidity assessments through clear PS walls
- Specimen transport and short-term storage at ambient temperature
- Rack-based batch processing for high-throughput benches
- General teaching and instructional lab exercises
Quality & Procurement
labsupplies.com is an authorized Caplugs® Evergreen dealer shipping these tubes from US inventory. Each bag is Made in USA and carries lot numbers that support traceability for CAP-, CLIA-, and ISO 15189-accredited facilities. Institutional and grant-funded tiered pricing is available for bulk and recurring orders.
Frequently Asked Questions
Are these test tubes sterile?
No. These tubes are supplied non-sterile and are intended for general laboratory use, reagent handling, and applications that do not require an aseptic vessel.
Do these tubes come with caps?
No caps are included. The spec covers the 19 mL polystyrene round bottom tubes only; closures must be ordered separately if your protocol requires them.
What rack size fits the 16 x 125 mm tubes?
The 16 x 125 mm dimension fits standard 16 mm test tube racks. Confirm well diameter against your existing racks before high-volume use.
Can polystyrene tubes be autoclaved?
No. Polystyrene is not autoclavable and will deform under steam sterilization. Treat these as single-use, disposable tubes for ambient-temperature workflows.