Sperm freezing straws are the primary cryogenic container format for human and animal sperm cryopreservation across both IVF and veterinary reproductive medicine. They are small-diameter plastic tubes made from polyvinyl chloride or similar cryogenically stable biocompatible materials, available in defined sizes compatible with standard equipment used for filling, sealing, labelling, thawing, and loading for insemination or IVF use.
The two standard straw sizes in widespread clinical and veterinary use are the 0.25 ml and 0.5 ml formats. Cryolab stocks several options to suit different applications. The CBS Sterile Clear PETG Sperm Straws are available in both 0.25ml and 0.5ml and are the dominant format for bovine AI in the 0.5ml size and human IVF andrology in the 0.25ml size. For enhanced security and traceability in clinical settings, the CBS High Security Sperm Straws provide hermetic sealing with a unique identification system. The CBS Embryo and Sperm Straws are available in flexible and rigid configurations across multiple capacities.
Straw sealing is a critical step frequently responsible for variability in cryopreservation outcomes when not performed consistently. After filling, straws must be sealed hermetically to prevent liquid nitrogen ingress during storage. Cryolab supplies the CBS High Security Tubes and Accessories range including CBS SYMS and SYMS III sealer systems designed specifically for high-security tube and straw sealing.
Labelling must comply with HFEA traceability requirements using materials rated for cryogenic temperatures. Use our Cryomarker fine-tip pens or Brady cryogenic label printers for reliable identification at minus 196 degrees Celsius. Browse our complete range of sperm freezing straws for IVF, andrology, and veterinary reproductive programmes across the UK.
