50 mL Conical Centrifuge Tubes — Threaded Cap, PPC, Natural, 1000/Bag (220-3937-080)
These 50 mL conical-bottom centrifuge tubes are molded from virgin-grade Polypropylene Copolymer (PPC) and supplied non-sterile in sealed 1000/Bag packaging for high-volume clinical and research workflows. The threaded cap delivers a leak-resistant seal that outperforms snap-cap formats under centrifugal force and during sample transport, while the conical bottom geometry concentrates cell pellets and precipitates at the tip for complete, low-dead-volume recovery. Lot-to-lot dimensional consistency ensures reliable seating in standard centrifuge rotor positions across the full case quantity.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 220-3937-080 |
| Volume | 50 mL |
| Bottom Style | Conical |
| Cap Style | Threaded — leak-resistant seal |
| Material | Polypropylene Copolymer (PPC) |
| Color | Natural |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| BPA / Phthalate Free | Yes |
| Country of Origin | USA |
Applications
- Cell culture harvesting — conical geometry pellets cells completely at the tube tip for maximum recovery
- Serum and plasma separation — threaded closure prevents leakage during centrifugation and subsequent handling
- Protein precipitation and density gradient centrifugation — precise pellet concentration at the conical tip
- Clinical specimen processing and transport — secure threaded seal prevents evaporation and contamination
- Reagent preparation and storage — chemical-resistant PPC compatible with aqueous buffers and common laboratory solvents
- Sample preparation workflows in CAP-, CLIA-, and ISO 15189-accredited laboratories requiring lot-traceable consumables
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, DCM) | Not recommended |
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. Sealed 1000/Bag packaging maintains product integrity from warehouse receipt through point-of-use, and lot-level quality controls ensure consistent conical geometry, wall thickness, and threaded cap torque performance across every bag. LabSupplies.com is an authorized Caplugs® Evergreen dealer, ships from USA inventory with same-business-day fulfillment for stocking items, and offers tiered pricing for institutional, hospital, and grant-funded laboratory accounts.
Frequently Asked Questions
Are these centrifuge tubes sterile?
No — the 50 mL tubes supplied under part number 220-3937-080 are non-sterile. They are intended for general cell culture, sample preparation, and specimen processing workflows where sterility is not a requirement. If your protocol requires sterile tubes, please contact us for alternatives.
Are PPC centrifuge tubes autoclavable?
Polypropylene Copolymer (PPC) offers good heat tolerance and is generally considered autoclavable; however, Caplugs® Evergreen has not published a validated autoclave cycle for these specific tubes. Confirm your sterilization requirements with your quality team before autoclaving, as the threaded cap seal may be affected by repeated high-temperature cycling.
What centrifuge rotors are these tubes compatible with?
The standard 50 mL conical format fits most swing-bucket and fixed-angle rotors designed for 50 mL conical tubes across major centrifuge platforms. Always verify maximum RCF ratings against your specific rotor manufacturer's specifications before centrifuging at high speeds.
Why choose a threaded cap over a snap-cap design for these tubes?
A threaded closure creates a more reliable leak-resistant seal under centrifugal force and during sample transport than a snap-cap format, reducing the risk of cross-contamination, evaporation, and sample loss — particularly important in clinical specimen handling and regulated laboratory environments.