These microcentrifuge tubes are manufactured from high-purity, medical-grade polypropylene and are designed for a wide range of molecular biology and biochemistry applications. They are engineered to be boil-proof and can withstand temperatures from -80°C to 121°C, making them suitable for various organic solvents. The tubes feature an integral snap cap for a secure seal, a frosted surface for easy labeling , and large, molded-in graduations for quick identification. With a high RCF rating, they are a reliable choice for all your centrifugation needs. Key Features & Benefits High-Purity Material: Manufactured using high-purity virgin USP Class VI Medical grade polypropylene (PP), free from natural rubber & heavy metal. High Centrifugal Strength: Can withstand a Relative Centrifugal Force (RCF) of up to 20,000 xg. Wide Temperature Range: Suitable for use in temperatures ranging from -80°C to 121°C and are boil-proof. User-Friendly Design: Feature an integral snap cap , a frosted surface that makes writing easier , and large molded-in graduations for easy identification. Certified Pure: Free of DNase, RNase, Human DNA, ATP, and Pyrogens