Overview
External Thread Cryogenic Tubes are essential for laboratories handling sensitive biological materials requiring ultra-low temperature storage. Their external threading design ensures a tight seal, preventing contamination and sample loss. These tubes are manufactured from high-grade polypropylene, which remains flexible and crack-resistant even at temperatures as low as -196°C. Commonly used in biobanks, research institutions, and pharmaceutical companies, these tubes meet stringent industry standards for sample integrity. Their design often includes features like printed graduations, color-coded caps, and sterile packaging to streamline workflow and ensure traceability.
Structure and Working Principle
The tube consists of a cylindrical body with an externally threaded neck and a matching screw cap. The threading system provides a secure closure, minimizing the risk of leaks during storage or transport. The cap often includes a silicone gasket for additional sealing. When sealed, the tube creates an airtight environment, protecting samples from moisture, air, and microbial contamination. The polypropylene material ensures chemical inertness, preventing interactions with stored samples. Graduation marks on the tube wall allow for precise volume measurement, critical for experimental reproducibility.
Key Features
External Thread Cryogenic Tubes are distinguished by their durability and user-friendly design. The external threading allows for easy handling, even with gloved hands, and reduces the risk of cross-contamination. The tubes are autoclavable and can withstand repeated freeze-thaw cycles without compromising integrity. Many models feature color-coded caps for quick identification and barcode labels for tracking. Some tubes are pre-sterilized using gamma irradiation, making them ready-to-use for sensitive applications. The material is free from DNase, RNase, and pyrogens, ensuring compatibility with molecular biology workflows.
Application Areas
These tubes are indispensable in fields requiring long-term sample preservation. In biobanking, they store DNA, RNA, cells, and tissues for future research. Clinical laboratories use them for patient-derived samples, such as blood and plasma, in diagnostic testing. The pharmaceutical industry relies on them for storing drug candidates and biologics during development. Research institutions utilize the tubes for archiving rare or irreplaceable specimens. Their compatibility with liquid nitrogen and mechanical freezers makes them versatile for various cold-chain applications.
Maintenance and Precautions
Proper handling ensures the longevity and performance of cryogenic tubes. Before use, inspect tubes for cracks or deformities, as compromised integrity can lead to sample loss. Avoid overfilling beyond the recommended volume (typically 80-90% capacity) to allow for expansion during freezing. For sterile applications, use pre-sterilized tubes or autoclave them at 121°C for 15-20 minutes. Label tubes with solvent-resistant markers or printed labels to prevent information loss during storage. When retrieving samples, avoid rapid temperature changes to prevent thermal shock, which can weaken the tube material.
B2B Procurement Guide
When sourcing External Thread Cryogenic Tubes, prioritize suppliers with ISO 13485 or similar certifications to ensure quality consistency. Bulk purchases (500+ units) typically offer cost savings, with prices ranging from $0.30-$1.50 per unit depending on specifications. Key procurement considerations include: tube capacity (1.5ml, 2ml, 5ml), sterilization status (sterile/non-sterile), cap color options, and compatibility with existing storage systems. Some manufacturers offer custom printing for branding or sample tracking. Request material certifications to verify chemical resistance and temperature tolerance claims.
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