Caplugs® Evergreen 8 mL Round Bottom Test Tubes, Polystyrene, 13 x 100 mm, Natural, 1000/Bag
These 8 mL Round Bottom Test Tubes are molded from optically clear polystyrene with a 13 x 100 mm footprint that drops into standard tube racks, automated analyzers, and benchtop centrifuge adapters. Bench scientists rely on them for sample aliquoting, routine clinical chemistry, and general specimen handling where rimless round-bottom geometry aids pipette access and complete liquid recovery.
Technical Specifications
| Product Type | Round Bottom Test Tubes |
| Volume/Size | 8.0 mL, 13 x 100 mm |
| Material | Polystyrene (PS) |
| Color | Natural (clear) |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| Country of Origin | USA |
Applications
- Routine clinical chemistry and serum sample handling
- Hematology and immunoassay specimen transfer
- Reagent dilution and aliquot preparation at the bench
- Sample storage on standard 13 mm tube racks
- Loading into automated analyzers accepting 13 x 100 mm tubes
- General-purpose mixing, decanting, and short-spin protocols
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 purchase orders.
Frequently Asked Questions
Are these test tubes sterile?
No. These tubes ship non-sterile and are intended for general laboratory and non-aseptic specimen handling. For sterile workflows, autoclaving polystyrene is not recommended due to its limited heat tolerance.
What rack and analyzer formats fit these tubes?
The 13 x 100 mm dimension is a standard 13 mm round-bottom format compatible with common tube racks and many automated analyzer carriers that accept 13 x 100 mm tubes. Confirm your specific instrument's tube specification before loading.
Can these polystyrene tubes be centrifuged?
Yes, for low to moderate g-forces typical of routine bench spins, provided tubes are properly supported in matched adapters. Polystyrene has lower mechanical strength than polypropylene, so avoid high-speed protocols.
Do the tubes come with caps?
This listing is for the round-bottom tubes only; caps are not included. Compatible 13 mm closures are sold separately and can be added to your order through labsupplies.com.