Gel-seal HEPA filters have the tank filled with PU gel, which is reliable and particularly suitable for workplaces for DOP test and leakage detection on site. This filter is suitable for controlling particulates which is larger than 0.3μm in working area of the clean rooms and purification equipment. Gel seal mini-pleat HEPA filters have side seal type and top  seal type for options. And also can provide with wet or dry type seal structure according to the need.