8.0 mL Round Bottom Test Tubes with Two-Position Snap Caps — PPC, Natural, Sterile, 25/Bag
These 8.0 mL round bottom test tubes measure 13 × 100 mm and are molded from virgin-grade Polypropylene Copolymer (PPC) in a natural (translucent) finish, supplied sterile and unassembled at 25 tubes and caps per bag. The round bottom geometry concentrates cell pellets and precipitates at the tube base for clean, efficient resuspension after centrifugation, while the integrated two-position snap cap switches between a vented configuration for gas exchange during incubation and a sealed configuration for containment during transport or storage. Part number 222-2381-080 is the standard 13 × 100 mm format widely used in flow cytometry, FACS, and serological workflows.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 222-2381-080 |
| Volume | 8.0 mL |
| Dimensions | 13 × 100 mm |
| Bottom Style | Round Bottom |
| Cap Type | Two-Position Snap Cap (vented / sealed) |
| Assembly | Unassembled (tubes and caps packaged separately within bag) |
| Material | Polypropylene Copolymer (PPC) |
| Color | Natural (translucent) |
| Sterility | Sterile |
| BPA / Phthalate Free | Yes |
| Pack Size | 25/Bag |
| Country of Origin | USA |
Applications
- Flow cytometry and FACS analysis — the standard 13 × 100 mm round bottom format fits most cytometer sample-uptake probes directly
- Cell sorting — round bottom concentrates sorted cell populations for straightforward post-sort resuspension and aspiration
- Immunofluorescence staining — PPC tolerates the aqueous buffers, alcohols, and blocking reagents used in IF protocols
- Hematology sample preparation — 8.0 mL capacity accommodates whole blood and dilution volumes typical for differential and CBC workflows
- Serological and agglutination assays — round bottom facilitates reading of agglutination patterns and pellet formation
- Specimen collection and transport — two-position snap cap seals securely for safe containment during transit
- General centrifugation and freeze-thaw cycling — PPC flexibility and impact resistance reduce tube fracture risk under repeated mechanical stress
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent |
| Dilute acids | Excellent |
| Dilute bases | Excellent |
| Methanol | Good |
| Isopropanol | Good |
| Acetonitrile | Good |
| Aromatic / chlorinated solvents | Limited — verify before use |
Quality & Procurement
Made in USA at Caplugs® Evergreen ISO-certified manufacturing facilities, these tubes are produced from domestically sourced, FDA-registered virgin-grade PPC resin that is BPA-free and phthalate-free. Lot-level quality controls ensure consistent tube geometry, wall thickness, and dimensional uniformity across every bag, supporting traceability requirements under CAP, CLIA, and ISO 15189 laboratory accreditation programs. Sterile sealed packaging maintains integrity from receipt through point-of-use without additional processing steps. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with tiered pricing available for high-volume institutional and grant-funded laboratories.
Frequently Asked Questions
Are the tubes and caps supplied already assembled?
No — the tubes and snap caps are packaged separately within the bag and are intended to be assembled immediately before use. This unassembled format preserves sterility and prevents cap deformation during storage and shipment.
What does the two-position snap cap do, and how do I switch between positions?
The snap cap has two distinct seated positions: one that leaves a gap for gas exchange (vented, useful during cell incubation) and one that creates a full seal for containment during centrifugation or transport. The cap snaps audibly into each position and can be switched by hand without tools.
Are these tubes compatible with standard flow cytometer sample probes?
Yes — the 13 × 100 mm round bottom format is the industry-standard geometry for flow cytometry and FACS instruments. The round bottom seats over most uptake probes without modification, and the natural PPC material does not interfere with optical detection. Always confirm dimensional fit against your specific instrument model.
Can these tubes be used for freeze-thaw cycling or centrifugation?
PPC (Polypropylene Copolymer) is specifically chosen for its flexibility and impact resistance, making these tubes well suited to repeated freeze-thaw cycles and centrifugation. For specific g-force limits, consult the manufacturer's documentation or contact LabSupplies.com for technical support.