Abdos Bio-Reaction Tubes are a convenient and economical option for small-scale, high-density suspension cell culture and biological reaction experiments. Manufactured from high-purity, virgin Class VI medical-grade polypropylene (PP) conforming to US FDA 21 CFR, these tubes are free from natural rubber and heavy metals. They are designed for both culture and centrifugation, allowing harvested cells to be directly centrifuged within the same tube. Key Features & Benefits Gas Exchange: The tubes consist of an ultrasonically welded 0.22 μm hydrophobic membrane to allow for sterile gas exchange. High-Purity Material: Made from virgin Class VI medical-grade polypropylene, free from natural rubber and heavy metals. High-Speed Centrifugation: Designed to withstand high RCF. The 15 ml and 50 ml conical bottom tubes can withstand up to 18,000g, and the 50 ml self-standing tubes can withstand up to 7,000g. Sterile and Pure: The tubes are sterile and certified free of DNase, RNase, and endotoxins. User-Friendly: Features a large frosted area for writing and engraved graduations for easy identification. IVDR Certified: This product is IVDR certified. Versatile Formats: Available in 15 ml (conical) and 50 ml (conical or self-standing) options.