50 mL Freestanding Centrifuge Tubes, Black Cap, Polypropylene Copolymer — 1000/Bag (240-3550-Z80)
These 50 mL freestanding centrifuge tubes from Caplugs® Evergreen are constructed from Polypropylene Copolymer (PPC), rated to 10,000 × g, and supplied non-sterile in an unassembled 1000/Bag format for efficient storage and dispensing. Molded-in graduations every 5 mL support accurate volume measurement directly on the tube, while the freestanding flat-bottom base eliminates the need for a rack during bench-top processing, centrifuge staging, and storage. The black cap enables straightforward color-coded batch and sample management across multi-cap-color laboratory systems.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 240-3550-Z80 |
| Product Type | Freestanding Centrifuge Tube |
| Volume | 50 mL |
| Maximum RCF | 10,000 × g |
| Graduations | Every 5 mL (molded-in) |
| Material | Polypropylene Copolymer (PPC) |
| Cap Color | Black |
| Tube Body Color | Natural |
| Base Style | Freestanding Flat Bottom |
| Sterility | Non-Sterile |
| Format | Unassembled |
| Pack Size | 1000/Bag |
| BPA / Phthalate Free | Yes |
| Country of Origin | USA |
Applications
- High-speed centrifugation up to 10,000 × g in clinical chemistry, molecular diagnostics, and research workflows
- Nucleic acid extraction (DNA/RNA) requiring a chemically resistant, large-volume tube
- Protein purification and cell culture processing at the 50 mL scale
- Microbiology and environmental laboratory sample collection and processing
- Bench-top specimen staging, aliquoting, and storage without an external rack — enabled by the freestanding flat-bottom base
- Color-coded batch and sample management in multi-cap-color laboratory systems using the black cap designation
- CAP-, CLIA-, and ISO 15189-supporting workflows that require lot-traceable consumables
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers and saline | Excellent |
| Dilute acids and bases | Excellent |
| Alcohols (ethanol, isopropanol) | Good — short-term contact |
| Ketones (e.g., acetone) | Limited — evaluate for your application |
| Chlorinated / aromatic solvents | Not recommended |
| Autoclaving | Compatible (polypropylene copolymer) |
Quality & Procurement
Made in USA, these Caplugs® Evergreen centrifuge tubes are manufactured from BPA-free, phthalate-free Polypropylene Copolymer resin and are lot-numbered to support traceability requirements in CAP-, CLIA-, and ISO 15189-accredited laboratories. LabSupplies.com is an authorized dealer of Caplugs® Evergreen consumables and ships from USA inventory, with tiered volume pricing available for high-throughput clinical, research, and institutional procurement programs.
Frequently Asked Questions
Are these centrifuge tubes sterile?
No — the 240-3550-Z80 tubes are supplied non-sterile. For workflows requiring sterile consumables, please contact us about sterile centrifuge tube options.
Do the tubes come assembled with caps attached?
No — these tubes are supplied unassembled (caps and tubes packaged separately within the bag). This format reduces package volume and is well suited to high-volume procurement and compact storage environments.
Can these tubes be used in a fixed-angle rotor without a rack?
Yes — the freestanding flat-bottom base allows stable bench-top placement without a rack before and after centrifugation. When centrifuging, always confirm that your rotor and adapters accommodate standard 50 mL conical tube dimensions.
What does the black cap indicate, and are other cap colors available?
The black cap is intended for color-coded sample and batch identification within multi-cap-color laboratory tube management systems. Caplugs® Evergreen offers 50 mL freestanding centrifuge tubes in additional cap colors; contact LabSupplies.com to identify the right option for your color-coding scheme.