Overview
Conical test tubes are essential lab tools designed for small-scale liquid handling and processing. Their conical shape facilitates efficient separation of phases during centrifugation, making them indispensable in biochemistry, pharmaceuticals, and clinical diagnostics. Available in glass (e.g., borosilicate) or plastic (e.g., polypropylene), they often include volume graduations and screw caps for secure storage. Standard sizes range from 5 mL to 50 mL, with larger variants used in industrial settings. Their versatility extends to educational demonstrations and quality control testing, where precise liquid manipulation is required.
Physical and Chemical Properties
Borosilicate glass conical tubes offer high thermal resistance (up to 400°C) and chemical inertness, suitable for acidic or alkaline solutions. Plastic variants, such as polypropylene, are lightweight, shatterproof, and ideal for disposable use but may have lower temperature tolerance (~120°C). Graduated markings ensure accurate volume measurement, while frosted labeling areas allow for sample identification. The conical design maximizes pellet formation during centrifugation, with angles typically between 30° and 45° for optimal separation efficiency.
Main Applications
In clinical labs, conical tubes are used for blood sample processing, DNA extraction, and urinalysis. Biotechnology applications include cell culture harvesting and protein purification. Industrial uses involve small-batch chemical reactions and viscosity testing. Their compatibility with automated rack systems enhances throughput in high-volume testing environments. Sterile, pre-packaged versions are critical for aseptic techniques in microbiology and vaccine development.
Safety and Storage
Glass tubes should be inspected for cracks before use to prevent leakage or implosion during centrifugation. Plastic tubes must be selected based on chemical compatibility; solvents like acetone can degrade certain polymers. Always balance centrifuge loads to avoid rotor imbalance. Store in clean, dry conditions away from reactive substances. Autoclave-safe models (marked with temperature limits) enable sterilization for reuse. Label contents clearly to prevent cross-contamination.
B2B Procurement Guide
Bulk buyers should prioritize suppliers with ISO 13485 or GMP certification for medical-grade tubes. Key considerations include material transparency (for visual inspection), cap seal integrity, and compliance with ASTM E1380 standards for graduations. For cost efficiency, evaluate reusable glass versus disposable plastic options based on application frequency. Custom printing (e.g., logos, barcodes) may be available for large orders. Request material safety data sheets (MSDS) for hazardous substance compatibility.
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