Cryotubes and freezing vials: how can integrity and traceability be preserved at very low temperatures?

The cryovials ensure cryopreservation of cells, microorganisms, DNA/RNA or tissues from -80 °C to -196 °C. Internal or external thread, heat-sealable versions, 1D/2D-barcoded tubes for traceability, options with preservation beads for microbial strains: each format is tailored to a specific application. Made from medical-grade PP, sterile and leak-proof (silicone/TPE seal), they integrate with manual or automated workflows for reliable storage, from sample collection to long-term archiving.

What are the different types of cryotubes, and how do you choose the right one?

Cryotubes combine materials, closure systems and coding to safeguard sample integrity. The most common choice is low-extractable polypropylene (PP), sterilised (SAL 10??), rated from +121 °C down to -196 °C. Choose between external-thread cryotubes (easy handling with gloves, low cap height, ideal for racks and automation) and internal-thread cryotubes (wide opening, protected threads, excellent containment). Heat-sealable versions eliminate any leak path via the cap. For traceability, 1D cryotubes (side barcode) and 2D cryotubes (DataMatrix in the base) streamline high-density inventory and automated reading. Some models incorporate a coded base with laser-etched ID, durable and readable under cryo conditions. For microbiology, cryotubes with preservation beads (porous carrier + cryoprotectant) allow single-strain storage and re-sampling.

Key criteria: compatibility with the liquid-nitrogen vapour phase, leak-tightness (silicone/TPE gasket), volumes (0.5 to 5 mL), self-standing or round bottom, cleanliness (DNase/RNase, pyrogens), code legibility at -80 °C, and fit to scanners/racks. From a sustainability standpoint, prioritise laser codes (no adhesives), compact packaging and reusable racks.

Type	Principle	Applications
External-thread cryotube	External threading + gasket for leak-tightness and easy handling	Storage in LN2 vapour phase
Internal-thread cryotube	Wide mouth, protected thread, cap that seats inside the neck	Cells, tissues, clinical specimens
2D cryotube (aluminium base)	DataMatrix in the base, rack reading in 96/48-well formats	High-density traceability, HTA/GLP
Heat-sealable cryotube	Thermal sealing of the neck, zero leak path	Sensitive biobanks, secure transport
Cryotube with beads	Beads impregnated with cryoprotectant	Microbial strain collections

In which fields are cryovials used?

• Life sciences : cell banks (cell lines, PBMCs), organoids, tissues. Traceability 1D/2D to link sample and metadata.
• Pharma/biotech : MCB/WCB, bioassays, stability samples; GxP compliance and auditable inventories.
• Microbiology & food : reference strains, yeasts, starter cultures; cryovials with beads for single-colony picking.
• Environment : environmental DNA banks, microbial isolates.
• Cosmetics & chemicals : cell banks, compound libraries in 2D tubes that can be heat-sealed.
• Clinical/biobanking : sera, plasma, biopsies; 2D code reading in 96-well racks for throughput and reliability.

Best practices: storage in the vapour phase of liquid nitrogen, leak-tightness checks, calibrated scanners, and SOPs for rapid thawing.

The different types of cryovials available

Frequently asked questions about cryovials

How do I choose between internal and external thread cryovials?
External thread vials are easier to handle with gloves and suit automation. Internal thread gives a wide mouth and protects the threads. Both seal reliably with the right cap and O-ring.

Can I immerse a cryovial in liquid-phase liquid nitrogen?
Vapour-phase storage is recommended. Otherwise, LN2 can ingress and the vial may crack or burst on thawing.

What are 2D-coded cryovials for, and do they fit 96-racks?
The 2D code on the base secures inventory and enables simultaneous reading in 96/48-well racks. Check scanner/rack compatibility and that the code is cryo-resistant.

Do heat-sealable cryovials replace a screw cap?
Yes. Heat sealing removes the cap leak path and cuts cross-contamination. Ideal for biobanking, transport and automated high-throughput workflows.

Are bead-filled tubes suitable for eukaryotic cells?
No, they are designed for microbial strains. For eukaryotic cells, use standard cryovials with a validated cryoprotectant (e.g. DMSO) and a controlled-rate freezing SOP.

What volumes and certifications should I prioritise for GxP use?
Select 0.5–5 mL according to matrix and protocol; sterile tubes with SAL 10??, DNase/RNase-free, readable 1D/2D barcodes, batch traceability and equipment compatibility.