Standard polyethylene screw caps can be used in closed systems, providing a liquid and gas sheer seal. Though, the caps can also be used in open systems by simply unscrewing the cap one quarter of a turn.
Vented polyethylene screw caps contain a 0.22 µm hydrophobic filter to allow gas exchange and minimize risk of cross-contamination.
Packed in durable and re-sealable(zip-closure) self-standing bags that allow the flask to remain upright and reduce contamination.
Each case has printed Lot No. for quality/traceability.