16 mL Round Bottom Test Tubes with Two-Position Snap Caps — PPC, Natural, Sterile, 25/Bag (222-2393-080)
These 16 mL polypropylene copolymer (PPC) round bottom test tubes measure 17 × 100 mm and are supplied sterile and unassembled — tubes and snap caps packaged separately within the bag for assembly immediately before use. The round bottom geometry concentrates cell pellets and precipitates at the tube base for efficient resuspension and aspiration after centrifugation, while the two-position snap cap enables either vented or sealed operation to suit incubation and transport workflows alike.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 222-2393-080 |
| Volume | 16 mL |
| Dimensions | 17 × 100 mm |
| Bottom Style | Round Bottom |
| Cap Type | Two-Position Snap Cap |
| Assembly | Unassembled |
| Material | Polypropylene Copolymer (PPC) |
| Color | Natural |
| Sterility | Sterile |
| Pack Size | 25/Bag |
| BPA / Phthalate Free | Yes |
| Country of Origin | USA |
Applications
- Flow cytometry and FACS analysis — the standard 17 × 100 mm round bottom format fits most instrument sample probes directly
- Immunofluorescence staining and cell sorting, where round bottom geometry ensures complete pellet recovery after centrifugation
- Hematology sample preparation and serological / agglutination assays requiring a contained, resealable tube
- Vented incubation of cell cultures or assay reactions using the snap cap's open position, then sealed containment during transport or storage
- General specimen collection and sample handling in clinical, research, and biotech environments
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent |
| Dilute acids | Excellent |
| Dilute bases | Excellent |
| Methanol | Compatible |
| Isopropanol | Compatible |
| Acetonitrile | Compatible |
| Aromatic solvents (e.g., toluene, xylene) | Limited — not recommended for prolonged contact |
| Chlorinated solvents (e.g., chloroform) | Not recommended |
Quality & Procurement
Made in USA at Caplugs® Evergreen ISO-certified facilities from virgin-grade, FDA-registered PPC resin, these tubes are BPA-free and phthalate-free. Lot-level quality controls verify consistent tube geometry, wall thickness, and dimensional uniformity across every bag, supporting traceability requirements under CAP, CLIA, and ISO 15189 accreditation. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with tiered pricing available for high-volume and grant-funded institutions.
Frequently Asked Questions
Are these tubes supplied already assembled with the snap caps attached?
No — part number 222-2393-080 is supplied unassembled, with tubes and two-position snap caps packaged separately within each bag. This preserves sterility and allows assembly immediately before use.
What does "two-position snap cap" mean in practice?
The snap cap has two distinct locking positions: an open (vented) position that allows gas exchange during cell culture incubation, and a closed (sealed) position that provides containment for transport, centrifugation, or storage. Switching between positions requires only a simple finger press.
Can these tubes be used in a centrifuge?
Yes — PPC (polypropylene copolymer) offers flexibility and impact resistance suited to centrifugation, and the round bottom concentrates pellets at the base for efficient resuspension. Always confirm your centrifuge rotor's maximum RCF and tube-size compatibility before use.
Are these tubes compatible with standard flow cytometry instruments?
The 17 × 100 mm round bottom format is the standard geometry for most flow cytometer and FACS sample-probe systems. Confirm your specific instrument's tube-dimension requirements against the 17 × 100 mm specification before switching from your current supply.