Overview
Sample tubes with clear caps are standard laboratory consumables designed for safe storage and handling of liquid or solid samples. The transparent body allows for easy visual inspection, while the snap-cap ensures a secure seal to prevent leaks or contamination. These tubes are typically made from polypropylene, offering excellent chemical resistance and durability. Common sizes range from 0.5 mL to 50 mL, with graduations for approximate volume measurement. They are widely used in molecular biology, clinical diagnostics, and chemical analysis due to their compatibility with centrifugation and freezing. The clear cap simplifies labeling and organization in high-throughput workflows.
Physical and Chemical Properties
Polypropylene-based sample tubes exhibit high thermal stability, withstanding temperatures up to 135°C for autoclaving. The material’s low moisture absorption (<0.01%) ensures sample integrity, while its translucency maintains visibility without compromising UV resistance. Tubes are often manufactured with a conical or round bottom for pelleting applications. The clear caps are designed with a hinged or separate snap mechanism, providing a tight seal rated for up to 12,000 x g centrifugation. Material inertness prevents interaction with acids, alkalis, and most organic solvents, though strong oxidizers may require fluoropolymer alternatives. Surface treatments like RNase/DNase-free certification are available for sensitive applications.
Main Applications
In clinical laboratories, these tubes are used for urine, blood, and tissue sample collection, often color-coded for specific tests. Molecular biology applications include PCR master mix preparation and nucleic acid storage, where the clarity aids in pipetting accuracy. The chemical industry employs them for catalyst testing or small-scale reactions. High-throughput screening workflows benefit from rack-compatible designs, while the autoclavability supports sterile techniques. Specialized versions with screw caps or O-rings are available for volatile samples. Their standardization ensures compatibility with automated liquid handling systems and cryogenic storage.
Safety and Storage
While polypropylene tubes are generally non-reactive, users should verify compatibility with specific chemicals—particularly strong acids like hydrofluoric acid. Caps must be fully seated before centrifugation to prevent aerosol generation. For cryogenic use, select tubes rated for -80°C to avoid brittleness. Storage recommendations include keeping tubes in low-humidity environments to prevent static buildup. Bulk packaging should retain original desiccant packs. Manufacturers typically provide USP Class VI or ISO 10993 certifications for medical-grade tubes, indicating biocompatibility for clinical applications.
B2B Procurement Guide
Bulk buyers should prioritize suppliers with ISO 13485 certification for consistent quality. Key specifications to confirm include cap seal integrity (tested via dye penetration), graduation accuracy (±5%), and gamma irradiation sterilization options. Volume discounts typically apply for orders exceeding 10,000 units. Customization options like pre-printed labeling areas, matrix tubes, or specific cap colors (while maintaining clarity) may incur additional costs. Lead times vary from 2-6 weeks for tailored products. Environmental-conscious buyers can request PCR (post-consumer recycled) polypropylene variants, though these may have slightly reduced clarity.
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