These centrifuge tubes are manufactured from ultra-pure, medical-grade polypropylene and are designed for high performance in all your laboratory centrifugation applications. The tubes feature a hydrodynamic conical bottom for perfect pelleting of sediments and a specially designed leak-proof cap with a unique plug seal. Highly transparent for easy sample viewing, they also include a large, frosted area for writing and clear, scratch-proof graduations. With an even wall thickness, these tubes are built to withstand high G-forces, making them a reliable choice for sample separation and storage. Key Features & Benefits High Centrifugal Strength: Feature an even wall thickness designed to withstand a maximum G-force of 18,000 xg RCF. Leak-Proof Cap: The cap has a built-in plug and a specially designed flat thread that confirms a perfect, vacuum-tight closure to prevent leaks. High-Purity Material: Manufactured from ultra-pure USP class VI certified virgin medical grade polypropylene to ensure the highest quality. Wide Temperature Range: Suitable for use in temperatures between -80°C and +121°C. User-Friendly Design: Includes a large white frosted portion for easy writing and easy-to-read, silk-screened graduations. Certified Pure & Sterile: Sterile tubes are validated for a Sterility Assurance Level (SAL) of 10⁻⁶ and are free from heavy metals and natural rubber.