50 mL Conical Centrifuge Tubes — Threaded Cap, PPC, Green, 1000/Bag (240-3937-G8PR2)
These 50 mL conical-bottom centrifuge tubes from Caplugs® Evergreen are molded from virgin-grade Polypropylene Copolymer (PPC) and feature a threaded, leak-resistant cap for reliable sealing during centrifugation, storage, and sample transport. Supplied non-sterile in 1000/Bag packaging, part number 240-3937-G8PR2 is manufactured at ISO-certified facilities and offers lot-to-lot dimensional consistency for dependable fit in standard 50 mL centrifuge rotor positions across clinical, research, and biotech workflows.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 240-3937-G8PR2 |
| Volume | 50 mL |
| Bottom Style | Conical |
| Cap Style | Threaded — leak-resistant seal |
| Material | Polypropylene Copolymer (PPC) |
| Color | Green |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| BPA / Phthalate Free | Yes |
| Country of Origin | USA |
Applications
- Cell culture harvesting — conical geometry concentrates cell pellets at the tube tip for maximum recovery with minimal dead volume
- Serum and plasma separation — threaded closure maintains a secure seal during centrifugation and subsequent cold storage
- Protein precipitation and density gradient centrifugation — conical bottom enables clean phase separation and complete pellet recovery
- Sample preparation and reagent storage — leak-resistant threaded cap prevents evaporation and contamination during extended storage or transit
- Clinical specimen processing in CAP/CLIA and ISO 15189 environments — lot-level traceability supports quality documentation requirements
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent |
| Dilute acids | Excellent |
| Dilute bases | Excellent |
| Methanol | Compatible |
| Isopropanol | Compatible |
| Acetonitrile | Compatible |
| Aromatic / chlorinated solvents | Not recommended — limited resistance |
Quality & Procurement
Made in USA at ISO-certified Caplugs® Evergreen manufacturing facilities, these tubes are produced from FDA-registered, virgin-grade PPC resin that is BPA-free and phthalate-free. Rigorous lot-level quality controls govern conical geometry, wall thickness, and threaded cap torque performance across every 1000-tube bag, ensuring consistent results run to run. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with tiered volume pricing available for high-throughput clinical labs, core facilities, and grant-funded research groups.
Frequently Asked Questions
Are these centrifuge tubes sterile?
No — they are supplied non-sterile in sealed 1000/Bag packaging. For applications requiring sterility, downstream sterilization by autoclave is compatible with PPC; however, confirm rotor and cap tolerances before autoclaving filled tubes.
How does the threaded cap compare to a snap-cap design for centrifugation and transport?
The threaded closure provides a more secure, leak-resistant seal than snap-cap formats under centrifugal force and during sample transport, reducing the risk of evaporation or cross-contamination in transit and long-term cold storage.
What is the advantage of PPC over standard polypropylene for centrifuge tubes?
Polypropylene Copolymer (PPC) retains the broad chemical resistance and autoclavability of homopolymer PP while offering improved impact toughness and flexibility at low temperatures — particularly useful for samples stored at –20 °C or below and for higher-g centrifugation runs.
Are these tubes compatible with standard centrifuge rotors?
Yes — the 50 mL conical format is dimensionally consistent with standard fixed-angle and swinging-bucket rotor positions designed for 50 mL conical tubes. Verify the maximum RCF rating of your specific rotor against your protocol requirements before use.