Caplugs® Evergreen
50 mL Tube Racks, Screw Caps, PPC, Green — 222-3937-G80 | 10/Bag | Caplugs® Evergreen
50 mL Tube Racks, Screw Caps, PPC, Green — 222-3937-G80 | 10/Bag | Caplugs® Evergreen
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Quick Reference
| Part Number | 222-3937-G80 |
|---|---|
| Capacity | 50 mL |
| Material | Polypropylene Copolymer (PPC) |
| Color | Natural |
| Base | Conical — requires rack or holder for upright use |
| vs Freestanding | Conical base only; no freestanding ring |
| Cap | Green screw cap — unassembled (in bag) |
| Pack Size | 10/Bag Unassembled |
| Sterility | Sterile |
| Origin | Made in USA |
| Price | $253.95/Bag ($25.3950/tube) |
Technical Narrative
The Caplugs® Evergreen 222-3937-G80 is a 50 mL Sterile PPC Conical Centrifuge Tube with Green Cap, 10/Bag Unassembled. 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 10/Bag Unassembled format provides cost-effective bulk supply for labs that assemble at the bench.
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: $253.95/Bag (10/Bag), $25.3950/tube. Siblings: 222-3936-G8D (50 mL PPC Conical Green Cap 20/Tray Assembled); 222-3550-G80 (50 mL PPC Freestanding Green Cap 10/Bag). LabSupplies.com ships from USA inventory, typically same business day.
Technical Specifications
| Part Number | |
|---|---|
| Caplugs Item # | |
| Capacity | 50 mL |
| Geometry | Conical bottom — standard centrifuge tube format; requires rack |
| Material | Polypropylene Copolymer (PPC) |
| Color | Natural |
| Cap | Green screw cap (unassembled) |
| vs Freestanding | No flat base ring — conical base only |
| Sterility | Sterile |
| Pack Size | 10/Bag Unassembled |
| BPA / Phthalate | BPA-Free, Phthalate-Free, Latex-Free |
| Country of Origin | USA |
| Price | $253.95/Bag ($25.3950/tube) |
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.
| Application | Setting / Configuration | Notes |
|---|---|---|
| PBMC isolation (Ficoll) | 50 mL Ficoll gradient, sterile conical | Standard 50 mL conical format; conical for buffy coat recovery |
| Large cell culture harvest | 50 mL scale suspension culture, BSC | Sterile PPC; conical pellet concentration |
| GMP cell washing | CAR-T / TIL / NK-cell wash steps | Sterile tray-assembled for GMP batch records |
| Bench centrifuge | Standard 50 mL conical rotor, up to 3000×g | Universal 50 mL conical rotor compatibility |
| Density gradient separation | Percoll / OptiPrep gradient, 50 mL | PPC clarity for gradient layer monitoring |
| Cold storage | 4°C / —20°C / —80°C in tube rack | PPC: cold-temperature flexibility; requires rack |
| Sterile reagent aliquoting | 50 mL media or buffer aliquots | Sterile; PPC compatible with standard media chemistry |
Chemical Resistance — Polypropylene Copolymer (PPC)
Compatibility reference for PPC at typical laboratory conditions.
| Reagent / Condition | Compatibility | Notes |
|---|---|---|
| Aqueous buffers / saline | Excellent | PPC inert across pH 2–12. |
| Cell culture media (RPMI, DMEM) | Excellent | Standard sterile cell culture material. |
| DMSO (<10%) | Excellent | Compatible with cryoprotectant concentrations. |
| Methanol / acetonitrile (<100%) | Excellent | Full organic solvent compatibility. |
| LN2 / —196°C | Excellent | PPC: maintains flexibility and seal integrity at LN2 temperatures. |
| —80°C freezer | Excellent | Standard cryogenic storage; no brittle fracture. |
| Formalin (10%) | Excellent | Compatible for fixation. |
| Dichloromethane / chloroform | Not Compatible | Causes cracking; do not use. |
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 10/Bag Unassembled format provides cost-effective supply for standard research labs that assemble at the bench.
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 — bag 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.
What is the difference between 20/Tray Assembled and 10/Bag Unassembled?
20/Tray Assembled: pre-assembled in open sterile rack tray for direct BSC pick-and-use. 10/Bag Unassembled: tube and cap in same bag for bench assembly before use. Tray preferred for GMP; bag for cost-efficiency.
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