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Reliable Cryogenic Tube, Specimen Storage, Private Label, Lab Consumables. 100% PP construction; selected source material states USP Class VI compliance. External/internal thread and self-standing configurations vary by SKU. Two-color molded caps and O-ring versions vary by SKU. Standard -80 degree Celsius and deeper cryogenic applications must be distinguished by exact product specification. Sterility, pressure resistance and low-retention claims require SKU-specific technical confirmation.