Abstract: An original equipment type seal for recharged toner cartridges can be installed by splitting the cartridge, placing the toner section of the cartridge in a fixture which can include a track for precision alignment of the seal with the opening to be sealed, having a heated platen with a contact surface typically consisting of portions that are curved and others that may be flat so that when under pressure, the platen makes intimate contact with the seal and seals the toner cartridge, with only temporary minor and not permanent distortion of the cartridge. Better results occur with the cartridge constrained by the use of a precision machined or otherwise adjusted support beneath the toner section of the cartridge. The non-linear design of the platen makes possible the use of the same sealing apparatus for multiple toner cartridges of similar size, such as the generally referred to 2100, 2300, 4000, and 4100 model toner cartridges.