Caplugs® Evergreen 5 mL Round Bottom Test Tubes, 12 x 75 mm, Polystyrene (PS), Red, 1000/Bag
These 5 mL round bottom test tubes are molded from clear polystyrene in the standard 12 x 75 mm format, with a red tint for sample coding and tray organization. Bench teams reach for them in routine immunoassay setup, flow cytometry sample staining, and general clinical specimen handling where a disposable, single-use vessel keeps workflows clean.
Technical Specifications
| Product Type | Round Bottom Test Tubes |
| Volume/Size | 5.0 mL, 12 x 75 mm |
| Material | Polystyrene (PS) |
| Closure/Cap | None (tubes supplied without caps) |
| Color | Red |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| Country of Origin | USA |
Applications
- Flow cytometry sample staining and resuspension in the 12 x 75 mm rack format
- Immunoassay and ELISA reagent aliquoting prior to plating
- Routine clinical specimen collection and aliquot handling
- Color-coded sample tracking across batched bench runs
- Serial dilution and reagent prep where an inert disposable tube is preferred
- General hematology and microbiology aliquot storage at ambient temperature
Quality & Procurement
labsupplies.com is an authorized Caplugs® Evergreen dealer shipping these tubes from US inventory, and the product is Made in USA. Each bag carries lot numbers so traceability is documented for CAP-, CLIA-, and ISO 15189-accredited labs. Institutional and grant-funded tiered pricing is available on bulk orders — contact our team for volume quotes.
Frequently Asked Questions
Are these tubes sterile?
No. These tubes are supplied non-sterile, which suits reagent prep, dilutions, and most routine bench work. For applications requiring sterility, autoclaving is not recommended because polystyrene has a low heat-deflection point.
What is the rim style and do they come with caps?
The 12 x 75 mm round bottom tubes are supplied without caps. Standard 12 mm push-on or snap caps sized for 12 x 75 mm tubes can be ordered separately if a closure is required.
Can polystyrene tubes be used in a centrifuge?
Polystyrene tolerates only low-speed centrifugation; consult your rotor's g-force limits before spinning. For higher relative centrifugal force, a polypropylene tube is the more appropriate choice.
Why choose the red-tinted version?
The red tint supports visual color-coding so analysts can distinguish sample sets, controls, or workflow stages at a glance in shared 12 x 75 mm racks, reducing mix-ups during batched runs.