Specifications: OD is 25mm, 0.22 micron Material: Hydrophilic PTFE Syringe filter applied to a small sample of laboratory filtration, adsorption of its small sample, thus ensuring the maximum recovery amount or a small amount of high-value samples, the filter housing is made of polypropylene material, ultrasonic welding, adhesive-free agents, and thus will not contaminate the sample.