Selection of filter membranes for insoluble particles using microscopic counting method

0.45 μ m filter membrane is the conventional first choice for insoluble particle experiments, suitable for most compliant detection scenarios, and applicable to test samples such as injections, eye drops, injection water, physiological saline, vaccines, etc; The 0.8 μ m filter membrane is only used in special scenarios (such as anti clogging of high viscosity samples) and requires strict validation to avoid being used for routine formulation testing. The applicable samples are high viscosity/easily clogged samples, such as syrup and emulsion.