Abdos Cryo Vials with external threads are designed for the secure, long-term cryogenic storage of biological samples, including all types of cells, enzymes, or reagents. Manufactured from high-purity, virgin USP Class VI medical-grade polypropylene (PP) conforming to US FDA 21 CFR standards, these vials are free from natural rubber and heavy metals. Their robust construction, featuring a leak-proof screw cap design and strong wall thickness, makes them suitable for both cryogenic storage and the transportation of samples and specimens. The external thread and screw cap design minimize handling contamination risks. Key Features & Benefits High-Quality Material: Made from high-purity virgin USP Class VI Medical grade polypropylene (PP), free from natural rubber & heavy metals. Cryogenic Storage: Designed for long-term storage at temperatures between -196°C and +121°C, suitable for mechanical freezing. Leak-Proof Design: Features a leak-proof cap design and strong wall thickness, ideal for sample transport. Tested leak-proof at 635 mm/Hg. Reduced Contamination Risk: External thread screw cap reduces contamination risks associated with handling. User-Friendly: Includes a large white frosted area for easy writing and silk-screen printed graduations for identification. Single-Hand Operation: Unique Star Foot design allows for single-hand operation when used with Abdos P20616 single-hand cryo holder rack. Certified Pure: Free from DNase, RNase, endotoxins, ATP, pyrogens, and human DNA. GC/MS tested. Sterile: Sterile versions are validated according to ISO 11137 for a Sterility Assurance Level (SAL) of 10⁻⁶. IVD Certified: Suitable for In-Vitro Diagnostic (IVD) use. Autoclavable: Can be autoclaved.