50 mL Tube Racks, Screw Caps, PPC, Green, Eppendorf/Beckman Compatible — 222-3936-G8D | 20/Tray | Caplugs® Evergreen

Quick Reference

Technical Narrative

The Caplugs® Evergreen 222-3936-G8D is a 50 mL Sterile PPC Conical Centrifuge Tube with Green Cap, 20/Tray Assembled. This is the standard conical-base format — distinguished from the freestanding series (222-3549-G8D / 222-3550-G80) by the absence of a flat base ring. The conical base provides the maximum centrifuge pellet concentration at the tube tip and is the standard format for centrifuge rotors designed for conical tubes. The 20/Tray Assembled format provides pre-assembled tube+cap units in an open sterile rack tray for direct BSC pick-and-use.

PPC provides improved cold-temperature flexibility over standard PP and PS, full organic solvent compatibility, and optical clarity for pellet and gradient monitoring. BPA-free, phthalate-free, FDA-compliant,

Procurement economics: $529.33/Tray (20/Tray), $26.4663/tube. Siblings: 222-3937-G80 (50 mL PPC Conical Green Cap 10/Bag Unassembled); 222-3549-G8D (50 mL PPC Freestanding Green Cap 20/Tray). LabSupplies.com ships from USA inventory, typically same business day.

Technical Specifications

50 mL Sterile PPC Conical Centrifuge Tube Applications

The is compatible with the following sterile workflows. Conical base concentrates the pellet at the tube tip for maximum recovery during centrifugation.

Chemical Resistance — Polypropylene Copolymer (PPC)

Compatibility reference for PPC at typical laboratory conditions.

Clinical & Research Laboratory Applications

Caplugs® Evergreen 50 mL sterile PPC conical centrifuge tubes with green caps serve cell therapy, immunology, and clinical laboratories requiring the standard conical-base centrifuge tube format in sterile PPC. The conical base is preferred when maximum pellet concentration at the tube tip is the priority — the conical geometry forces all sedimented material to the smallest possible volume at the tip, enabling complete supernatant removal with minimal disturbance of the pellet. Labs using standard centrifuge rotors designed for conical tubes (which hold the tube by the tip-to-shoulder transition) should choose conical format for secure rotor seating. The freestanding alternatives (222-3549/3550) are selected when BSC rack-free handling or bench upright positioning is the priority. The 20/Tray Assembled format is preferred for GMP cell therapy workflows where pre-assembled open-tray tube access minimizes batch record assembly steps.

U.S. Manufacturing, Quality & Institutional Procurement

Caplugs® Evergreen products are manufactured in the United States under ISO 9001 quality management from FDA-compliant, food-contact-grade resins. BPA-free, phthalate-free, and latex-free, with material-disclosure documentation supporting CAP, CLIA, and ISO 15189 laboratory accreditation audits.

LabSupplies.com is an authorized dealer for the full Caplugs Evergreen catalog and ships directly from USA inventory — typically same business day for stocking SKUs. We offer below retail pricing on volume orders, tiered institutional and academic pricing, and direct support for grant-funded laboratories and government procurement channels. Lab managers and procurement officers can request a written quote or speak with a product specialist directly from our sales engineering team.

Frequently Asked Questions

Are the 50 mL conical tubes sterile?

Yes. Sterile — tray sterile-packed.

What is the difference between the 50 mL conical and the 50 mL freestanding (222-3549-G8D / 222-3550-G80)?

The conical format has a standard tapered conical base only — it requires a tube rack or holder to stand upright, and concentrates the pellet maximally at the tube tip during centrifugation. The freestanding format adds a flat base ring that allows the tube to stand upright without a rack — useful for BSC rack-free handling. Select conical for maximum pellet concentration and standard centrifuge rotor compatibility; select freestanding for rack-free BSC use.

Is the 50 mL conical format compatible with standard Falcon-style rotors?

Yes. The 50 mL conical tube format (222-3936/3937) is dimensionally compatible with standard 50 mL conical centrifuge rotor positions used across major centrifuge platforms (Beckman Coulter, Thermo, Eppendorf, etc.). Verify adapter compatibility for your specific rotor.