Filter and method for making a filter

A filter comprising:

• (a) layer of polytetrafluoroethylene;
• (b) layer of organic vapor adsorbing medium comprising activated carbon;
• and
• (c) scrim layers covering said layer of polytetrafluoroethylene and said layer of organic vapor adsorbing medium, and wherein the filter has sealed edges;
• wherein said filter as a figure of merit greater than about 60 wherein the figure of merit is calculated based upon a fractional efficiency determined for particles having a size of 0.3 .mu.m and an air flow having a velocity of 10.5 ft./min. and for Frazier permeability at 0.5 inches H.sub.2 O.

A filter comprising:

• (a) layer of electrostatic medium having a thickness of between 0.1 and about 5.0 mm;
• (b) layer of organic vapor adsorbing medium comprising activated carbon;
• and
• (c) scrim layers covering said layer of electrostatic medium and said layer of organic vapor adsorbing medium, and wherein said filter has sealed edges;
• wherein said filter has a figure of merit greater than about 60, wherein the figure of merit is calculated based upon a fractional efficiency determined for particles having a size of 0.3 .mu.m in an air flow having a velocity of 10.5 ft./min. and for Frazier permeability at 0.5 inches H.sub.2 O.

A method for preparing a filter for use in removing particulates and organic vapors from an air stream provided inside of a disk drive, said method including steps of:

• (a) providing a filter comprising:
• (i) layer of particulate removal medium having a thickness of between about 0.1 and about 5.0 mm;
• (ii) layer of organic vapor adsorbing medium comprising porous activated carbon beads affixed to a substrate, wherein the porous activated carbon beads have an average diameter of between about 0.3 and about 1 mm., and said porous activated carbon beads being impregnated with between 1 and 20% by weight chemical for adsorbing acid gas;
• and
• (iii) scrim layers covering said layer of particulate removal medium and layer of organic vapor adsorbing medium, and wherein said filter has sealed edges,
• (b) placing said filter inside a disk drive.

A method for preparing for a filter for use in removing particulates and organic vapors from an air stream provided inside of a disk drive, said method including steps of:

• (a) providing a filter comprising:
• (i) layer of polytetrafluoroethylene;
• (ii) layer of organic vapor adsorbing medium comprising activated carbon;
• and
• (iii) scrim layers covering said layer of particulate removal medium and layer of organic vapor adsorbing medium and wherein said filter has sealed edges;
• and
• (b) placing said filter inside a disk drive.

A method for preparing a filter for use in removing particulates and organic vapors from an air stream provided inside of a disk drive, said method including steps of:

• (a) providing a filter comprising:
• (i) layer of electrostatic medium having a thickness of between 0.1 and about 5.0 mm;
• (ii) layer of organic vapor adsorbing medium comprising an activated carbon;
• and
• (iii) scrim layers covering said layer of electrostatic medium and said layer of organic vapor adsorbing medium, and wherein said filter has sealed edges;
• and
• (b) placing said filter inside a disk drive.