UltraCruz^® Cell Culture Flasks for Suspension Cells with Vent Caps are manufactured under the most stringent conditions and include a 100% integrity test to assure the reliability with your tissue and cell culture work. Suspension culture flasks are made from Class 100,000 clean room, USP class VI virgin polystyrene, and ISO 9001:2000 quality management systems in order to provide consistent tissue and cell culture performance of our flasks. Suspension culture flasks are non-treated and gamma irradiation sterilized. Surfaces are flat and free from striation to provide improved transparency. Cell Culture Flasks are provided with vent caps that contain a 0.22 µm filter to allow gas exchange and minimize the risk of cross contamination. Suspension culture flasks include engraved graduations on two sides and ridges for easy stacking, and innovative angled neck design offers excellent pipette access.