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K8D

Heavy-Duty No-Drift Bi-Directional Hydraulic Piston Seal

The design includes an integrated rubber quad ring seal in the outer filled-PTFE cap to ensure positive sealing and drift-free operation in heavy-duty service application for large diameter piston sealing applications. Designed to separate and seal two different media, e.g. fluid/gas. Commonly used in piston accumulators, mobile hydraulics and where low-friction, high-pressure drift-free sealing performance is required. Retro fits seals of similar design.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	3,800psi (260bar)	5,000psi (350bar)	-40°F to 400°F (-40°C to 210°C)	6ft/s (1.8m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, most modern hydraulic fluids and gases
Permachem 6150	5,000psi (350bar)	6,000psi (420bar)	-40°F to 400°F (-40°C to 210°C)	6ft/s (1.8m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure or for any advice, please contact engineering@ahpseals.com

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K8E

Low-Friction Bi-Directional Hydraulic Piston Seal

Cap seal providing low friction and long service life over a wide range of light- to medium-duty bi-directional service applications. The K8E retrofits into standard O-ring grooves designed for no back-up, single, or two back-up rings without modification. The specially designed filled-PTFE cap resists extrusion and twisting of the O-ring under higher pressure.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	3,800psi (260bar)	5,000psi (350bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150	5,000psi (350bar)	6,000psi (420bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, surface speed above 5ft/s (1.3m/s), or for any advice, please contact engineering@ahpseals.com

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K8E

Low-Friction Bi-Directional Hydraulic Piston Seal

Cap seal providing low friction and long service life over a wide range of light- to medium-duty bi-directional service applications. The K8E retrofits into standard O-ring grooves designed for no back-up, single, or two back-up rings without modification. The specially designed filled-PTFE cap resists extrusion and twisting of the O-ring under higher pressure.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	3,800psi (260bar)	5,000psi (350bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150	5,000psi (350bar)	6,000psi (420bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, surface speed above 5ft/s (1.3m/s), or for any advice, please contact engineering@ahpseals.com

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K8P

Low-Friction Bi-Directional Piston Seal

PTFE cap seal providing low friction and long service life over a wide range of light-duty bi-directional service applications. The thin PTFE cap is more responsive to low-pressure sealing applications and can be used for pneumatic and light-duty hydraulic sealing.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	3,800psi (260bar)	5,000psi (350bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150	5,000psi (350bar)	6,000psi (420bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, surface speed above 5ft/s (1.3m/s), or for any advice, please contact engineering@ahpseals.com

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K8P

Low-Friction Bi-Directional Piston Seal

PTFE cap seal providing low friction and long service life over a wide range of light-duty bi-directional service applications. The thin PTFE cap is more responsive to low-pressure sealing applications and can be used for pneumatic and light-duty hydraulic sealing.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	3,800psi (260bar)	5,000psi (350bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150	5,000psi (350bar)	6,000psi (420bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, surface speed above 5ft/s (1.3m/s), or for any advice, please contact engineering@ahpseals.com

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L1

Labyrinth Seal

Economical non-contact labyrinth seal designed to exclude light splashing of liquids and/or fine to coarse granular contaminants.

Minimal component wear, minimal frictional loss, and no special preparation of mating surfaces are key advantages of this seal. High circumferential speeds are possible depending upon application. Small quantities are available in 3 days.

Operating Range

Material	Pressure	Temperature	Surface Speed	Dry-run
Duraloy 5163	zero	-40 to 170°F (-40 to 80°C)	Up to 12,000 fpm (60m/s)	YES
Duraloy 1258	zero	-40 to 400°F (-40 to 200°C)	Up to 14,000 fpm (70m/s)	YES

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L2

Labyrinth-type seal

Non-contact labyrinth seal designed to exclude light splashing of liquids and/or fine to coarse granular contaminants.

Minimal component wear, minimal frictional loss, and no special preparation of mating surfaces are key advantages of this seal. High circumferential speeds are possible depending upon application. Seal retention and improved static sealing performance are improved with O-rings on contacting shaft and housing. Small quantities are available in 3 days.

Operating Range

Material	Pressure	Temperature	Surface Speed	Dry-run
Duraloy 5163	zero	-40 to 170°F (-40 to 80°C)	Up to 12,000 fpm (60m/s)	YES
Duraloy 1258	zero	-40 to 400°F (-40 to 200°C)	Up to 14,000 fpm (70m/s)	YES

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MC20

Metal-cased PTFE double-lip rotary shaft seal

The redundant seal lips enable this seal to handle higher pressure and create additional sealing capabilities, especially under flooded conditions, and are usually used for hydraulic motors, pumps, and transmissions.

Operating Range

Material	Continuous Pressure	Max.Pressure Spike	Temperature	Surface Speed	Application	Dry-run	PV-Rating
Permachem 6233	200psi (14bar)	300psi (20bar)	-58 to 400°F (-50 to 200°C)	Up to 3,500 fpm (17.5m/s)	standard oil lubrication, high waterbased fluids	YES	8
Permachem 6235	200psi (14bar)	300psi (20bar)	-58 to 400°F (-50 to 200°C)	Up to 3,500 fpm (17.5m/s)	Soft shaft material, gaseous media, FDA compliant	YES	8
Duraloy 4736	200psi (14bar)	300psi (20bar)	-58 to 400°F (-50 to 200°C)	Up to 3,500 fpm (17.5m/s)	low wear and abrasion, long service life	YES	8

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MC21

Metal-cased PTFE rotary seal with wiper lip

This high-performance seal design incorporates a formed primary seal lip and an opposed secondary lip that provide dirt exclusion and act as a lube retainer, typically used for gearboxes and environmental seals. It may be used either lubricated or unlubricated. It is designed specifically for high-speed and low pressure sealing applications.

Operating Range

Material	Continuous Pressure	Max.Pressure Spike	Temperature	Surface Speed	Application	Dry-run	PV-Rating
Permachem 6233	110psi (7.6bar)	150psi (10bar)	-58 to 400°F (-50 to 200°C)	Up to 5,000 fpm (25m/s)	standard oil lubrication, high waterbased fluids	YES	5
Permachem 6235	110psi (7.6bar)	150psi (10bar)	-58 to 400°F (-50 to 200°C)	Up to 5,000 fpm (25m/s)	Soft shaft material, gaseous media, FDA compliant	YES	5
Duraloy 4736	110psi (7.6bar)	150psi (10bar)	-58 to 400°F (-50 to 200°C)	Up to 5,000 fpm (25m/s)	low wear and abrasion, long service life	YES	5

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MC22

Metal-cased Spring-loaded lip medium-pressure PTFE rotary shaft seal with wiper lip

The spring-loaded lip design allows the seal to accommodate low rpm shaft runout or coaxial misalignment up to 0.020″ and high surface speeds. The opposing lip facing the environment acts as a dust wiper for dirt exclusion and as a lubricant retainer. It is capable of handling extreme temperature, aggressive media, higher surface speeds, low to medium pressures, and can even run dry. Typical applications are gearboxes, mixers, and augers.

Operating Range

Material	Continuous Pressure	Max.Pressure Spike	Temperature	Surface Speed	Application	Dry-run	PV-Rating
Permachem 6233	110psi (7.6bar)	150psi (10bar)	-58 to 400°F (-50 to 200°C)	Up to 2,500 fpm (12.5m/s)	standard oil lubrication, high waterbased fluids	YES	5
Permachem 6235	110psi (7.6bar)	150psi (10bar)	-58 to 400°F (-50 to 200°C)	Up to 2,500 fpm (12.5m/s)	Soft shaft material, gaseous media, FDA compliant	YES	5
Duraloy 4736	110psi (7.6bar)	150psi (10bar)	-58 to 400°F (-50 to 200°C)	Up to 2,500 fpm (12.5m/s)	low wear and abrasion, long service life	YES	5

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MCB10

Metal-cased single fluoropolymer lip rotary shaft seal

This high-performance seal design incorporates a formed seal lip, mechanically locked into a metal body. This design creates very low parasitic friction under load and adds much lower heat generation than most seal designs. This allows the seal to be used successful at higher peripheral speeds, where heat generation is the primary mode of failure for most seals. The seal is resistant to a very wide range of chemicals allowing it to be used where elastomeric seals cannot be. Selection of the correct lip and body material will allow use in food and pharmaceutical applications requiring FDA compliance.

Operating Range

Material	Continuous Pressure	Max.Pressure Spike	Temperature	Surface Speed	Application	Dry-run	PV-Rating
Permachem 6233	110psi (7.6bar)	300psi (20bar)	-80 to 400°F (-60 to 200°C)	Up to 5,000 fpm (25m/s)	standard oil lubrication, high waterbased fluids	YES	5
Permachem 6235	110psi (7.6bar)	300psi (20bar)	-80 to 400°F (-60 to 200°C)	Up to 5,000 fpm (25m/s)	Soft shaft material, gaseous media, FDA compliant	YES	5
Duraloy 4736	110psi (7.6bar)	300psi (20bar)	-80 to 400°F (-60 to 200°C)	Up to 5,000 fpm (25m/s)	low wear and abrasion, long service life	YES	5

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K8D

K8E

K8E

K8P

K8P

L1

L2

MC20

MC20HP

MC21

MC22

MCB10

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