15 mL Conical Centrifuge Tubes with Green HDPE Screw Caps — PS Tube Body, Unassembled, 1,000/Bag (240-2448-G50)
These 15 mL conical centrifuge tubes pair a natural polystyrene (PS) tube body with a green high-density polyethylene (HDPE) threaded screw cap, supplied unassembled in bulk bags of 1,000 for cost-efficient procurement and flexible workflow assembly. The standard 17 × 120 mm conical geometry fits 15 mL rotor positions across all major centrifuge platforms, while the glass-like optical clarity of the PS tube body allows direct visual assessment of pellet formation and supernatant quality without removing the tube from the rack. Supplied non-sterile, the 240-2448-G50 is well suited to high-throughput clinical processing, research sample storage, and color-coded specimen management.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 240-2448-G50 |
| Tube Volume | 15 mL |
| Tube Dimensions | 17 × 120 mm |
| Tube Bottom Geometry | Conical |
| Tube Material | Polystyrene (PS) |
| Tube Color | Natural (clear) |
| Cap Material | High-Density Polyethylene (HDPE) |
| Cap Color | Green |
| Cap Type | Threaded Screw Cap |
| Assembly State | Unassembled — 1,000 tubes + 1,000 caps per bag |
| Sterility | Non-Sterile |
| Pack Size | 1,000/Bag |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Country of Origin | USA |
Applications
- Conical centrifugation and cell pelleting at standard clinical and research speeds
- Serum, plasma, and whole-blood processing in clinical and hospital laboratories
- Urine, environmental, and biochemistry aliquot storage with green-cap color coding for specimen-type differentiation
- Supernatant collection and multi-step separation workflows where optical clarity is essential for pellet visualization
- High-throughput sample archiving and biobanking where bulk unassembled packaging supports pre-labeling before point-of-use assembly
Compatibility
The standard 17 × 120 mm conical format is designed to seat in 15 mL rotor positions across all major centrifuge platforms. Verified compatible instruments include Eppendorf® 5810R and 5804R centrifuges fitted with the A-4-81 swing-bucket rotor, Beckman Coulter® centrifuges with standard 15 mL conical adapters, and Thermo Fisher Sorvall™ models including the ST16R, Legend X1R, CL10, and Fiberlite™ F15-6×100y rotor. Always confirm your instrument's maximum rated g-force and rotor capacity in the instrument manual before committing to a large-volume purchase, as rotor specifications vary by model and adapter configuration.
Chemical Resistance
| Reagent / Condition | Tube Body (PS) | Cap (HDPE) |
|---|---|---|
| Aqueous buffers / saline | Excellent | Excellent |
| Dilute acids and bases | Good | Excellent |
| Ethanol (<70%) | Not recommended | Good — short-term contact |
| Acetone | Not recommended | Not recommended |
| Chloroform / aromatic solvents | Not recommended | Not recommended |
| Autoclave sterilization | Not suitable | Not suitable |
Quality & Procurement
Made in USA, these Caplugs® Evergreen centrifuge tubes are produced from virgin, BPA-free, phthalate-free resin under ISO 9001 quality management. The threaded HDPE screw cap delivers a positive torque-resistant seal that maintains integrity at standard centrifugation forces up to 4,000 × g for the 15 mL conical format. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with tiered pricing available for institutional, hospital, and grant-funded laboratory accounts. The unassembled bulk format allows procurement teams to reduce per-unit cost while giving bench staff the flexibility to pre-label tubes before capping at point of use.
Frequently Asked Questions
Are these centrifuge tubes and caps supplied already assembled?
No — each bag contains 1,000 PS tube bodies and 1,000 green HDPE caps packed separately (unassembled). This format supports pre-labeling workflows and gives laboratory staff the flexibility to assemble tubes at the point of use.
Are these tubes sterile, and can they be autoclaved?
The tubes are supplied non-sterile. Because the tube body is polystyrene and the cap is HDPE, neither component is suitable for autoclave sterilization; PS in particular will deform under standard autoclave temperatures and pressures.
What is the maximum centrifugation speed for these tubes?
The 15 mL conical format with threaded HDPE screw cap is rated for centrifugation up to 4,000 × g under standard conditions. Always consult your centrifuge and rotor manual to confirm compatibility and maximum rated g-force before use.
Why are the caps green, and are other cap colors available?
Green caps are commonly used in laboratory color-coding schemes to designate specific specimen types — such as urine, environmental, or biochemistry aliquots — in multi-analyte workflows. Related family members in the Caplugs® Evergreen line are available with natural and red caps, enabling single-vendor procurement across your entire color-coding system.