0.5 mL Racks, Freestanding, PPC, Natural — 220-3929-080 | 1000/Bag | Caplugs® Evergreen

0.5 mL Freestanding Flat-Bottom Cryogenic Tubes — PPC, Natural, 1000/Bag (220-3929-080)

These Caplugs® Evergreen MST™ 0.5 mL cryogenic tubes are built from polypropylene copolymer (PPC) for reliable performance across the full cryogenic temperature range — from –80 °C ultra-low temperature (ULT) freezers through liquid nitrogen (LN2) storage at –196 °C. The freestanding flat-bottom design allows upright placement on any bench surface without an additional rack, and the snap cap provides a secure seal to protect sample integrity during long-term archiving or dry-ice shipment. Supplied non-sterile in sealed 1000/Bag packaging, part number 220-3929-080 is well-suited for high-throughput biobanking, clinical biospecimen repositories, and research freezer programs.

Technical Specifications

Applications

• Biobanking and long-term cell line or tissue sample archiving in LN2 or vapor-phase nitrogen dewars
• DNA and RNA cryopreservation requiring stable storage at –80 °C or below
• Serum and plasma aliquot cryopreservation for clinical and translational research programs
• Clinical biospecimen repositories operating under CAP, CLIA, or ISO 15189 accreditation frameworks, where lot-level traceability is required
• Dry-ice shipment of frozen samples between sites or to reference laboratories
• High-throughput sample banking workflows where freestanding tubes eliminate the need for a separate tube rack during bench-side aliquoting

Chemical Resistance

Quality & Procurement

Made in USA, these MST™ cryogenic tubes are manufactured by Caplugs® Evergreen at ISO-certified facilities using virgin-grade, FDA-registered PPC resin that is BPA-free and phthalate-free. PPC's copolymer formulation maintains tube flexibility and crack resistance at cryogenic temperatures where standard polypropylene homopolymer can become brittle, making it the appropriate material choice for LN2 and ULT applications. Every bag ships with lot number and manufacturing date to support full traceability for accredited clinical and research laboratories. LabSupplies.com is an authorized Caplugs® Evergreen dealer and ships from domestic USA inventory, providing consistent supply without offshore lead-time risk — an important consideration for labs managing frozen specimen workflows on tight timelines.

Frequently Asked Questions

Are these cryogenic tubes sterile?
No — they are supplied non-sterile in sealed 1000/Bag packaging. If your application requires sterile tubes, contact us about sterile MST™ format options or consult your biosafety protocol for appropriate decontamination procedures before use.

Why is PPC used instead of standard polypropylene for cryogenic storage?
Polypropylene copolymer (PPC) retains flexibility and impact resistance at very low temperatures, whereas standard PP homopolymer can become brittle below approximately –40 °C. This makes PPC the preferred material for tubes subjected to liquid nitrogen, vapor-phase nitrogen, or –80 °C ULT storage, where thermal cycling and mechanical stress during retrieval could otherwise cause cracking.

Do these tubes require a rack, or can they stand on their own?
The flat-bottom freestanding design allows the tubes to stand upright on any bench surface without a separate rack, which simplifies aliquoting and sample retrieval during active cryogenic workflows.

Does each bag include lot and date information for accreditation purposes?
Yes — each bag of 220-3929-080 is labeled with a lot number and manufacturing date, supporting the chain-of-custody and traceability documentation required by CAP, CLIA, and ISO 15189 accredited laboratories.