16 mL Round-Bottom Test Tubes with Two-Position Snap Caps — PPC, Natural, Sterile (222-2394-08I)
These 16 mL polypropylene copolymer (PPC) round-bottom test tubes measure 17 × 100 mm and arrive sterile in individual packaging, ready for flow cytometry, cell sorting, immunofluorescence, and other cell-based workflows where maintaining sterility through point-of-use is critical. The integrated two-position snap cap toggles between a vented configuration for gas exchange during incubation and a sealed configuration for containment during transport or centrifugation. Part number 222-2394-08I is manufactured by Caplugs® Evergreen from virgin-grade, FDA-registered PPC resin at an ISO-certified domestic facility.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 222-2394-08I |
| Volume | 16 mL |
| Dimensions | 17 × 100 mm |
| Bottom Style | Round Bottom |
| Cap Type | Two-Position Snap Cap (vented / sealed) |
| Material | Polypropylene Copolymer (PPC) |
| Color | Natural |
| Sterility | Sterile |
| Pack Size | 1 / Individually Packed |
| BPA / Phthalate Free | Yes |
| Country of Origin | USA |
Applications
- Flow Cytometry & FACS: The 17 × 100 mm round-bottom format is the standard geometry for most flow cytometer sample-uptake probes; the two-position cap seals tubes during transport to the instrument.
- Cell Sorting & Immunofluorescence: Round-bottom geometry concentrates stained cell populations into a tight pellet after centrifugation, enabling efficient resuspension in buffer or antibody solution.
- Hematology Sample Preparation: The 16 mL working volume accommodates whole-blood dilutions and lysis protocols common in CBC differential workflows.
- Serological & Agglutination Testing: The round base promotes uniform agglutination patterns for gel card or tube-based blood bank assays.
- General Specimen Handling & Storage: Individual sterile packaging makes these tubes suitable for primary specimen collection and freeze-thaw cycling without cross-contamination risk.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent |
| Dilute acids | Excellent |
| Dilute bases | Excellent |
| Methanol | Compatible |
| Isopropanol | Compatible |
| Acetonitrile | Compatible |
| Aromatic solvents (benzene, toluene, xylene) | Use with caution — verify before use |
| Chlorinated solvents (chloroform, DCM) | Not recommended |
Quality & Procurement
Made in USA, these Caplugs® Evergreen tubes are produced under ISO-certified quality management using virgin-grade, FDA-registered PPC resin that is BPA-free and phthalate-free. Individual sterile packaging provides lot-level traceability to support CAP, CLIA, and ISO 15189 accreditation documentation requirements. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with tiered volume pricing available for hospitals, reference labs, and research institutions purchasing on grant or institutional accounts.
Frequently Asked Questions
Are these tubes sterile, and does individual packaging preserve that sterility?
Yes — each tube is sterilized and sealed in individual packaging at the factory. The sterility barrier remains intact until you open the package, making these tubes appropriate for cell culture, specimen collection, and any workflow where contamination control is paramount.
What does "two-position snap cap" mean in practice?
The cap has two distinct locking positions: one that leaves a small vent opening for gas exchange during incubation or when using CO₂-sensitive assays, and a second fully closed position that seals the tube for centrifugation, transport, or storage. No separate cap or parafilm is needed to switch between the two modes.
Can these tubes be used in a centrifuge, and will the round bottom hold up?
The PPC construction provides the flexibility and impact resistance needed for routine centrifugation. The round bottom concentrates pellets at a single focal point, which simplifies aspiration of supernatant and resuspension of cell pellets. Always verify your centrifuge rotor's tube-diameter and g-force ratings against the 17 × 100 mm format before use.
Are these tubes compatible with CAP- and CLIA-regulated laboratories?
The ISO-certified manufacturing process and individual lot traceability make these tubes suitable for accredited clinical environments. Lot numbers are available for documentation in quality management systems supporting CAP, CLIA, and ISO 15189 compliance.