* Flask Body: Polystyrene (GPPS) * Bottle Cap: High-density Polyethylene (HDPE) * Filter Membrane: Polytetrafluoroethylene (PTFE) * Conforming to USP CLASS VI * Various treated surfaces are suitable for different culture needs * The hydrophobic vent cap ensures continuous ventilation, enabled by turning the cap 1/4 of its full range * The tilted bottleneck facilitates pipets and cell scrapers for easy access * Low appearance design supports folding, effectively use the internal space of the incubator * The frosted area near the bottleneck can be written on * Volume graduations printed and molded on both sides * 100% Pass the strict online gas tightness tests * Lot No. on the bottom of each flask and package bag for quality traceability * Sterilized by irradiation, SAL 10-6 * DNase/RNase free, non-pyrogenic and non-cytotoxic