Abstract: A salt mixture used for chemical strengthening of data recording disks is subjected to sub-micron filtration prior to use to remove certain impurities. Preferably, glass disks are chemically strengthened by ion exchange in a bath of molten sodium nitrate and potassium nitrate. A salt fresh mixture is prepared by starting with high-grade bulk salt in the intended proportions, melting the salt, and filtering the salt in a stainless steel filter, which is preferably approximately 2 micron or smaller. Filtration removes trace amounts of certain contaminants. The salt mixture thus prepared is then used for chemical strengthening of disks in the conventional manner.

Abstract: A salt mixture used for chemical strengthening of data recording disks is subjected to sub-micron filtration prior to use to remove certain impurities. Preferably, glass disks are chemically strengthened by ion exchange in a bath of molten sodium nitrate and potassium nitrate. A salt fresh mixture is prepared by starting with high-grade bulk salt in the intended proportions, melting the salt, and filtering the salt in a stainless steel filter, which is preferably approximately 2 micron or smaller. Filtration removes trace amounts of certain contaminants. The salt mixture thus prepared is then used for chemical strengthening of disks in the conventional manner.

Abstract: A tray for retaining disks includes first and second longitudinally extending, spaced apart, parallel rods. A plurality of support plates are directly attached to the rods. Each support plate has at least one notch formed therein for receiving a respective support member. A plurality of rails are attached to the support plates. At least three spaced apart wires are provided. Each wire is formed to have a zigzag configuration adapted to receive and support the disk at an outer peripheral edge thereof. One of the wires is disposed to contact the outer periphery of the disk at a position of zero degrees, another one of the wires is disposed to contact the outer periphery of the disk at a position less than 90 degrees, and a further one of the wires is disposed to contact the outer periphery of the disk at a position greater than 270 degrees.

Abstract: A tray for retaining disks includes first and second longitudinally extending, spaced apart, parallel rods. A plurality of support plates are directly attached to the rods. Each support plate has at least one notch formed therein for receiving a respective support member. A plurality of rails are attached to the support plates. At least three spaced apart wires are provided. Each wire is formed to have a zigzag configuration adapted to receive and support the disk at an outer peripheral edge thereof. One of the wires is disposed to contact the outer periphery of the disk at a position of zero degrees, another one of the wires is disposed to contact the outer periphery of the disk at a position less than 90 degrees, and a further one of the wires is disposed to contact the outer periphery of the disk at a position greater than 270 degrees.