Centrifuge Tubes with Conical Bottom

The cap features an integrated seal ring—molded as part of the cap rather than a separate O-ring that can be lost. When the cap is tightened, this seal ring compresses against the tube rim, creating a positive, leakproof seal that withstands internal pressures generated during centrifugation. This design prevents sample loss, aerosol generation, and contamination, ensuring absolutely leakproof performance even at maximum G-forces.

Yes, these centrifuge tubes are manufactured from polypropylene and are fully autoclavable at standard sterilization temperatures (121°C). They can be autoclaved for sterile applications such as cell culture work, and for safe decontamination of biohazardous materials before disposal. The tubes maintain their clarity, graduations, and mechanical properties through multiple autoclave cycles.

The tubes feature bold, solvent-resistant printed graduations that provide accurate volume references during sample preparation. Unlike molded graduations which can be difficult to read, printed graduations offer high contrast and clarity. The ink is resistant to alcohols, acids, and common laboratory solvents, ensuring the markings remain legible even after autoclaving and chemical exposure. This makes these tubes the best choice for precision work and the top rated for convenience.

Yes, each tube features an integrated matte-finished writing area on the outer surface. This area accepts pencil, permanent marker, and adhesive labels, providing ample space for sample identification including IDs, dates, experiment codes, and other critical information. The writing area ensures traceability and supports chain-of-custody documentation requirements.

The conical bottom (tapered tip) is designed to facilitate efficient pellet formation during centrifugation. The tapered shape concentrates pelleted material at the very bottom tip, allowing complete aspiration of supernatants without disturbing the pellet. This design also enables recovery of very small sample volumes that might be lost in round-bottom tubes. The smooth interior surface minimizes sample retention.

These tubes are moulded from high-quality polypropylene, chosen for its excellent optical clarity, mechanical strength, chemical resistance, and autoclavability. Polypropylene provides the ideal balance of properties for centrifuge tubes, allowing clear visualization of contents while withstanding the mechanical stresses of high-speed centrifugation.

Both sizes are supplied in economical packs of 100 pieces: Code 63301 (15ml) in packs of 100, and Code 63302 (50ml) in packs of 100. This high-volume packaging ensures laboratories have an adequate supply for daily workflows while maintaining cost efficiency and reducing packaging waste.

Yes, these tubes are designed to be compatible with most standard centrifuge rotors, buckets, and adapters from major manufacturers. The 15ml and 50ml sizes conform to industry-standard dimensions, ensuring proper fit in swinging-bucket and fixed-angle rotors. Always verify compatibility with your specific rotor and adapter requirements.

Polypropylene offers excellent resistance to a wide range of laboratory chemicals including aqueous solutions, dilute acids and bases, alcohols, and many organic solvents. However, prolonged exposure to strong oxidizing agents, concentrated acids, or some chlorinated solvents may affect the material. For specific chemical compatibility with your samples or reagents, consult standard polypropylene resistance charts.

Yes, polypropylene maintains its properties at low temperatures, making these tubes suitable for sample freezing and storage at -20°C and -80°C. However, for liquid nitrogen storage (-190°C), we recommend our polycarbonate MCT boxes (Code 63213/63214) which are specifically designed for cryogenic temperatures. These centrifuge tubes are suitable for standard freezer storage.

These centrifuge tubes combine multiple features that make them exceptional: premium polypropylene construction for clarity and strength; two optimized sizes (15ml and 50ml) for versatility; high G-force ratings (7500xG/12000xG) for demanding protocols; absolutely leakproof seal with built-in seal ring; clear printed graduations for accurate measurement; integrated writing area for sample identification; autoclavable construction for sterility; conical bottom for efficient pellet recovery; and economical 100-piece packs for value. This comprehensive design, focused on real laboratory needs, makes these tubes the best choice and the top rated solution for centrifugation applications.