30 mL Conical Bottom Centrifuge Tubes — Threaded Cap, PPC, Natural (220-3928-080)
These 30 mL conical bottom centrifuge tubes are molded from virgin-grade Polypropylene Copolymer (PPC) and feature a threaded, leak-resistant cap that outperforms snap-cap formats under centrifugal force and during sample transport. Supplied non-sterile in bulk (1000/Bag), part number 220-3928-080 is well suited for clinical specimen processing, cell culture harvest, and preparative centrifugation workflows where consistent pellet recovery and secure closure are essential.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 220-3928-080 |
| Volume | 30 mL |
| Bottom Style | Conical |
| Cap Style | Threaded — leak-resistant seal |
| Material | Polypropylene Copolymer (PPC) |
| Color | Natural |
| Sterility | Non-Sterile |
| BPA / Phthalate Free | Yes |
| Pack Size | 1000/Bag |
| Country of Origin | USA |
Applications
- Cell culture harvest: conical geometry concentrates cell pellets at the tube tip for complete recovery with minimal dead volume
- Serum and plasma separation: secure threaded closure maintains sample integrity before and after centrifugation
- Protein precipitation and density gradient centrifugation: reliable threaded seal prevents leakage at speed
- Clinical specimen processing and storage: leak-resistant closure controls evaporation and contamination risk in CAP/CLIA-regulated workflows
- Reagent preparation and general sample storage requiring a robust, resealable 30 mL format
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent |
| Dilute acids | Excellent |
| Dilute bases | Excellent |
| Methanol | Good |
| Isopropanol | Good |
| Acetonitrile | Good |
| Aromatic solvents (toluene, xylene) | Limited — verify before use |
| Chlorinated solvents (chloroform, DCM) | Not recommended |
Quality & Procurement
Made in USA, these Caplugs® Evergreen centrifuge tubes are manufactured under ISO-certified quality management from FDA-registered, virgin-grade PPC resin that is BPA-free and phthalate-free. Lot-to-lot dimensional consistency ensures reliable fit in standard centrifuge rotor positions and reproducible threaded cap torque performance across every 1000-tube bag. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with tiered pricing available for high-volume institutional and grant-funded purchasers.
Frequently Asked Questions
Are these centrifuge tubes sterile?
No — they are supplied non-sterile in 1000/Bag bulk packaging. For applications requiring sterility, such as aseptic cell culture, consider a gamma-irradiated or certified sterile alternative.
Will the threaded cap hold during centrifugation?
Yes. The threaded closure is designed to deliver a leak-resistant seal under centrifugal force, making it more reliable than snap-cap formats for sealed centrifugation and sample transport. Always confirm your specific centrifuge rotor's maximum RCF rating against your protocol requirements.
What is Polypropylene Copolymer (PPC), and how does it differ from standard PP?
PPC is a copolymer formulation of polypropylene that retains PP's excellent chemical resistance to aqueous buffers, dilute acids and bases, and common alcohols, while offering improved impact toughness and clarity compared to standard homopolymer PP. It is not suitable for use with chlorinated or aromatic solvents.
Are these tubes suitable for regulated clinical laboratory workflows?
The tubes are manufactured under ISO-certified quality management with lot-level traceability, which supports documentation requirements in CAP/CLIA and ISO 15189 environments. End users are responsible for validating the tubes within their specific laboratory quality system.