In suspension cell culture, cell shaker is a kind of cell consumable with high usage rate. Common specifications include 125ml，250ml，500ml，1000ml, etc. The lid is an important part of the cell culture vessel, which shoulders multiple functions such as sealing and air permeability, so what material is the lid made of?

The lid of cell flask  is usually made of high density polyethylene raw material by injection molding process. High density polyethylene is white powder or granular product, non-toxic and tasteless. This material has excellent hardness, tensile strength and creep property, good wear resistance, toughness and cold resistance. At room temperature, it is insoluble in any organic solvent and resistant to acid, reduction and corrosion of various salts. It is a good raw material for making LIDS and is also one of the commonly used raw materials for various plastic containers.

The lid of the flask is divided into a breathable cover and a sealed cover. The top of the breathable cover is equipped with an air vent, which is designed with PTFE hydrophobic film. It does not affect the sealing and breathable effect of the breathable film after contact with the liquid. The seal cover is completely sealed. It is mostly used for cell and tissue culture under sealed conditions, so that the culture environment is completely isolated from the outside world. If ventilation is needed, it can be achieved by loosening the cover for a quarter of a week.

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