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We offer Freudenberg Sealing Technologies to make Packings for static and dynamic applications with an excellent sealing effect and remain elastic even with continuous changes in temperature and pressure. They are also characterized by their resistance to chemicals, are flexible, have a long service life, and high extrusion resistance.

Applications:

• Most commonly used in the following applications:
• Propeller shafts Cardan shaft
• Rolling mills
• Shafts and propeller shafts against dust

Stuffing Box Packings

Consisting of various materials, the packings of Freudenberg Sealing Technologies have a wide variety of applications. They are flexible and characterized by their long service life. Packings are used in a number of applications in the process industry. Packings offer an excellent sealing effect with constant elasticity. They are firmly pressed into the installation space, remaining elastic even when temperature and pressure are changing constantly. Added to these features are a high extrusion resistance and dry-running capability.

Multi-part Merkel Chevron Seal Set comprising one thrust ring, one or two seals and a back-up ring

Product advantages

Seal set for robust operating conditions, predominantly the provision of spare parts for older plant. Merkel Chevron Seal set EK, EKV can be used for pistons with pressure on one side or “back to back” for piston with pressure on both sides

• Proven under extreme conditions
• High durability
• Can be optimally adjusted to the related application
• Functions over a certain time period even with poorer surfaces.
• Insensitive to soiling
• For application and design related reasons, fluctuations in the leakage behaviour and in the friction behaviour are to be expected.

Application

Injection moulding machines, presses, marine hydraulics, scrap cutters, iron and steel industry, special cylinders, steel hydraulics, engineering.

Material

Pressure ring

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Multi-component Merkel seal set for sealing piston rods, consisting of a pressure ring, at least 3 seals and a back-up ring. The Merkel Chevron Seal Sets are available in 3 different designs. Type A has 3 to 5 fabric roof-shaped seals and can be installed in adjustable or non-adjustable sealing areas . Type B has 3 to 5 fabric roof-shaped seals, one rubber sprung back-up ring and is installed in non-adjustable sealing areas. Constant axial pre-load. Type C has 2 to 4 fabric roof-shaped seals, one rubber seal and can be installed in adjustable and non-adjustable sealing areas. For an enhanced sealing effect type A & B can be supplied in open form. Type C is always delivered in endless form.

Product advantages

Seal set for robust operating conditions, mainly for provision of spare parts to old plant

• Proven under extreme conditions
• Long service life
• Can be optimally adjusted to the related application
• Functions over a certain time period even with poorer surfaces
• For application and design-related reasons fluctuations in the leakage behaviour and friction behaviour are to be expected.

Application

Injection moulding machines, presses, marine hydraulics, scrap cutters, iron and steel industry, special cylinders, steel hydraulics, engineering.

Material

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Five-piece Merkel compact seal L43 comprising one profile ring, two back-up rings and two angled bushes.

Product advantages

The Merkel Piston Seal L43 is used for sealing pistons with pressure on both sides. The angled rings guide the piston on the cylinder bore.

• No extrusion into the radial sealing gap
• Suitable for rapid pressure change
• Sealing component protected against twisting.

Application

Earth moving equipment, agricultural machinery, cranes, standard cylinders.

Material

Sealing component

Back-up ring

Angled bush

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Merkel Compact Seal S8 is a one-piece seal with a rubber head set in fabric part

Product advantages

Compact rod seal, also for standardised housings according to ISO 5597;

• Easy to fit
• Excellent Sealing effect also in the lower pressure range
• Low friction due to fabric part

Application

Standard cylinders, telescopic cylinders, machine tools, spindle seals

Material

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Merkel Double Wiper PT 2 consisting of one profile ring made from PTFE with a sealing edge and a wiper edge, as well as two O-rings as sealing and pre-load components.

Product advantages

Double wiper for improvement of total tightness. The Merkel Double Wiper PT 2 is mainly fitted in combination with rod seals Merkel Omegat OMS-S. A pressure relieving bore is to be provided between seal and wiper

• Excellent regulation and positioning in operation
• Low friction, free of stick-slip
• Material variants for short stroke and high frequency; available on enquiry
• Especially suitable for large diameters.

Application

Injection moulding machines, presses, mills, steel hydraulics engineering.

Material

Profile ring

O-ring

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U-ring with wiper lip (double lip wiper); sealing edge of wiper lip lightly rounded.

Product advantages

Double wiper for improvement of total tightness; dimensions also for standardised housing according to ISO 6195 Type C

• Sealing lips pointing inwards fulfill the function of a U-ring
• Wiper lip with lightly rounded sealing edge reliably wipes away dirt and leaves a residual oil film on the retracting rod
• Tightness, service life and friction behaviour of the entire system are improved.

Merkel double wiper PU 11 is preferably fitted in combination with our rod seals Merkel Omegat OMS-MR. The double-lip wiper can take pressures up to 1.6 MPa. if higher pressures can build up we recommend a pressure relieving bore between seal and wiper.

Application

Industrial vehicles, injection moulding machines, standard cylinders.

Material

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Profiled Merkel Guide Ring Guivex KBK for Pistons and Guide Ring Guivex SBK for Rods, made from fabric-base laminate. Patented product design (patent no. PCT/EP95/03874).

Product advantages

Merkel KBK / SBK guide rings offer clear advantages over conventional guide strips/rings, designed for standardized housings according to ISO 10766 amongst others Interchangeable to existing operating environments of the types SB and SF High radial load Very good utilization of the guide length through even distribution of stress Improved drawing-in of lubricating medium through optimized distribution of stress in the contact zone between guide bush and counter-acting surface Reduced stick-slip tendency Outstanding running behavior with short guide distances (no clamping).

Application

Long stroke cylinders (piston rod bowing under load), short guide distances, short stroke, friction-optimised sealing systems, additional item for metal guides, mobile hydraulics, heavy-duty hydraulics

Material

∅ range≤300

∅range >300

Surface quality

Percentage contact area Mr>50% to max.90% at cutting depth c=Rz /2 and reference line C ref =0%.

Design notes

The diameter D1 is to be considered exclusively in relation to the guide ring. The corresponding diameter for the adjacent seal housing is to be matched to the sealing component.

Tolerance recommendation

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Non-metallic Merkel Piston Guide Ring KB & Rod Guide Ring SB.

Product advantages

Non-metallic guide element for pistons and rods; for standardised housings amongst others, according to ISO 10766

• Metal/fabric-base laminate materials combination prevents “seizing”
• High load bearing capacity, elastic behaviour up to break point
• Chamfered profile edges prevents pressing of edge into the corner radii of the housing groove
• Simple snap-in fitting.

Application

Earth moving equipment, industrial vehicles, agricultural machinery, cranes, injection moulding machines, loading platforms, steel hydraulic engineering, presses, support cylinders.

Material

Slotted ring ≤300

Ready to fit strip cut to size >300

Surface quality

Percentage contact area Mr>50% to max.90% at cutting depth c=Rz /2 and reference line C ref =0%.

Tolerance recommendation

The tolerance definition for the dimensions D and dF must be viewed in connection with the seal used. The diameter D1 specified in the dimensions is to be viewed exclusively in relation to the guide ring. The corresponding diameter of an adjoining seal housing should be tailored to the sealing component.

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Two-piece Merkel seal set for sealing pistons, consisting of one PTFE profile ring and an O-ring as a pre-load component.

Product advantages

Merkel Omegat OMK-MR is used where a piston has pressure on both sides. OMK-MR is provided with pressure-compensation grooves for rapid pressure change

• Very high resistance to pressure and hardness
• Good thermal conductivity
• Very good protection against extrusion
• High resistance to abrasion
• Low friction, free of stick-slip.

Application

Presses, agricultural machinery, injection moulding machines, mills, marine hydraulics, industrial vehicles, cranes, handling equipment, control and regulation equipment.

Material

PTFE profile ring

O-ring

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Two-piece Merkel seal set made of PTFE profile ring with one O-ring as a pre-load component.

Product advantages

Rod seal used in particular in sealing systems

• Very high resistance to pressure
• Good thermal conductivity
• Very good extrusion resistance
• High resistance to abrasion
• Low friction, free of stick-slip.

Application

Industrial vehicles, handling equipment, agricultural machinery, cranes, injection moulding machines, presses, marine hydraulics, control and regulation equipment, mills.

Material

PTFE profile ring

O-ring

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Merkel u-ring with asymmetrical profile, outer lip set back and press fit at the inside diameter.

Product advantages

Single-acting piston seal for standardised housings, amongst others, according to ISO 5597

• Very good static and dynamic tightness

Application

Earth moving equipment, support cylinders, presses.

Material

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Merkel u-ring with asymmetrical profile, outer lip set back and press fit at the inside diameter.

Product advantages

Single-acting rod seal for the standardised housings, amongst others, according to ISO 5597; very suitable as a secondary seal within a sealing system

• Good media resistance
• Wide operating temperature range
• Very good static and dynamic tightness
• Low breakaway force (in comparison to compact seals or U-rings with secondary sealing edge in corresponding material)
• Dynamic deformation value

Application

Earth moving equipment, agricultural machinery, injection moulding machines, support cylinders, cranes, loading platforms, fork-lift trucks, standard cylinders

Material

Φ range < 500 mm

Φ range > 500 mm

Operating conditions

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Dirt wiper with metal housing, wiper lip protruding; AS -AUAS with slightly rounded sealing edge.

Product advantages

Single-acting wiper for the protection of cylinders against ingress of dirt , use in standardised housings, amongst others, according to ISO 6195 Type B

• Secure seating in housing (press fitting)
• No open ring gap to the outside (dirt pocket) between rod and wiper housing
• No pressure build-up between wiper and the seal
• Axially open, easy to manufacture housing.

As a preference, we recommend the use of the more modern type AUAS R. The wiper lip with a radius reliably wipes away dirt and simultaneously leaves a residual film of oil on the retraction rod; friction behaviour , tightness and service life of the whole system are further improved.

Application

Earth moving equipment, agricultural machinery, loading platforms, support cylinders, industrial vehicles, cranes, presses.

Material

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We offer Freudenberg Sealing Technologies makes a comprehensive range of pneumatic seals, such as piston and rod seals, damper seals as well as grippers and suction caps for automation. In addition to the standard products, Freudenberg Sealing Technologies offers individual solutions tailored specifically for the corresponding application. All products are characterized by their long service life.

Applications:

• Most commonly used in the following applications:
• Handling systems
• Packaging machinery
• Pneumatic cylinders in automation technology
• Pneumatic cylinders in plant and mechanical engineering

Rod Seals (Pneumatic)

NIPSL 310

The state-of-the-art pneumatic seals of Freudenberg Sealing Technologies are used in dynamic applications and employ combined wiping/sealing elements due to the lower operating pressures in comparison with those arising in hydraulics. In connection with special materials, the use of the pneumatic seal therefore leads to the development of a high-performance sealing system with an excellent price/performance ratio.

Types:

AIRZET PR AU NIPSL NIPSL NIPSL 300 NIPSL 210

.

Piston Seals (Pneumatic)

NAP210

The pneumatic piston seals of Freudenberg Sealing Technologie seal the piston reliably against the cylinder tube and guarantee its movement efficiently with minimum friction and no drift. They are used in a variety of modern sealing systems. The pneumatic piston seals are adapted to the respective operating conditions and tasks and persuade due to their high functionality.

Types:

NAP300 NAPN AIRZET PK TDUOP

Damping Seals (Pneumatic)

AU DIP

The 3-in-1 Damp & Seal damper seal of Freudenberg Sealing Technologies combines the functions of three components in a single one, which extremely simplifies processes in the manufacturing of pneumatic cylinders, thereby relieving purchasing, warehouse and logistics departments. In addition, the 3-in-1 Damp & Seal damper seals offer excellent damping properties due to their specific design and highly loadable materials.

Types:

AU DIP DIP D&S 300

.

Applications:

Most commonly used in the following applications:

• Agricultural, forestry, and construction machinery
• Construction machinery
• Fork lifts
• Hydraulic motors
• Hydraulic stands
• Hydraulic systems
• Industrial trucks
• Injection moulding machines
• Loading cranes
• Piston rods
• Presses
• Rolling mills
• Standard cylinders

Standard Cylinder

A standard cylinder design is shown → Fig. The rod is guided in a bronze, plastic or brass bush and is fitted with a combined wiper and rod seal (Merkel Combination Seal AUNIPSL).

The piston is sealed using two pneumatic U-rings (Merkel U-Ring NAP 300, Merkel U-Ring NAP 310). A separate guide is installed between the U-rings.

Simmering with a fabric reinforced static part that is securely joined to the elastomer sealing lip. The sealing lip is also pre-loaded with a garter spring.

Product advantages

Sealing ring is used, in case of adequate lubrication by the medium to be sealed, preferably where shafts pass through walls in mills and large gearboxes in heavy machinery manufacture.

• Particularly robust static part
• Lasting radial contact pressure
• Highly wear-resistant

Application

Mills, ship building, steel hydraulic engineering, wind power plants

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Simmering with a fabric reinforced static part that is securely joined to the elastomer sealing lip. The sealing lip is also pre-loaded with a garter spring.

Product advantages

Sealing ring is used, in case of adequate lubrication by the medium to be sealed, preferably where shafts pass through walls in mills and large gearboxes in heavy machinery manufacture

• Particularly robust static part
• Lasting radial contact pressure
• Highly wear-resistant
• With design measures, e.g. metal support for the sealing lip, higher pressures are possible
• Overpressure requires the usage of endless seals
• Back-up ring drawings and installation instructions for open seals are available.

Application

Mills, ship building, steel hydraulic engineering, wind power plants

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Simmering with a fabric reinforced static part that is securely joined to the elastomer sealing lip. The sealing lip is also pre-loaded with a garter spring.

Product advantages

Sealing ring is used, in case of adequate lubrication by the medium to be sealed, preferably where shafts pass through walls in mills and large gearboxes in heavy machinery manufacture.

• Particularly robust static part
• Lasting radial contact pressure
• Highly wear-resistant

Application

Mills, ship building, steel hydraulic engineering, wind power plants.
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Simmering with a fabric reinforced static part that is securely joined to the elastomer sealing lip. The sealing lip is also pre-loaded with a garter spring.

Product advantages

The sealing ring has a groove around the circumference to facilitate additional lubrication from the outside. The simmering radiamatic R 58 was developed for the special requirements of grease lubricated bearings in mill manufacture.

• Particularly robust static part
• Lasting radial contact pressure
• Highly wear-resistant

Application

Mills

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High speed simmering made from two functionally suitable elastomer components and an integrated steel strip. Two interleaved tension springs ensure an even radial force over the entire circumference length of the sealing edge even with high shaft center offset.

Product advantages

Self-holding simmering for shaft pass through walls in mills and large gear boxes in heavy machinery manufacture. The sealing ring has radial grooves to facilitate additional lubrication from outside. Only endless self holding simmering are available.

• Long lasting tight fit
• Lasting radial contact pressure
• Highly wear-resistant
• High permissible shaft offset
• High permissible circumferential speed

Application

Rolling mills, large gearboxes.

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• Design: special types , on enquiry
• Outer casing: elastomer (smooth)
• Spring-loaded sealing lip
• Additional dust lips
• High resistance to dirt ingress
• Robust solution.

Product advantages

• Lengthening of maintenance interval for individual units
• Shaft must not be hardened or ground
• Old solution can usually be replaced by simmering cassette seal without change to housing
• The shaft must not be machined on maintenance or seal replacement.

Application

• Agricultural machinery (tractors)
• Tractor/hub
• Tractors/propeller shafts*
• Harrows
• Motorized cultivators
• Tillers
• Fertilizer spreading machinery
• Construction machinery (road rollers, excavators, fork lift trucks, mixers)
• Axles: hubs
• Axles: propeller shafts*.

Material

Acrylonitrile-butadiene rubber

Fluoro elastomer

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• Design: special types , on enquiry
• Combination of a simmering and an additional seal against dirt from the outside in one housing
• Spring-loaded sealing lip
• Additional dust lips
• Primarily for usage in all application with high level of soiling e.g. in axles for off-road vehicles
• Use preferably instead of the simmering Cassette Seal in case if super imposed rotational and translation movements.

Product advantages

• Long service life
• High resistance to dirt ingress due to the optimal positioning of sealing lip and dust lip.

Performance in relation to dirt from outside

• High resistance to dirt from outside suitable for protection against dry dirt.

Application

• Agricultural machinery (tractors)
• Drives for agricultural vehicles and in general industry
• Drives for rotating, sometimes running shafts in dry application areas.

Material

Acrylonitrile-butadiene rubber

Fluoro elastomer

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• Outer casing: elastomer (smooth)
• Spring-loaded sealing lip and sealing lip with helix edge without spring
• Additional dust lip
• Modern sealing lip profile
• Friction-optimised primary seal lip 1 made from fluoro rubber 75 FKM 585
• Secondary seal lip with additional dust lip 2
• Grease fitting with special lubricant Kluber Petamo GHY 133 N.

Product advantages

• Broad range of applications for example in industrial gearboxes
• Reliable sealing of the housing bore, even with increased roughness of the bore, thermal expansion and split housings thus a sealing of low viscosity and gaseous media also possible
• Very long service life and reliability especially when subject to strong external dirt and /or contamination(metal abrasion, cast sand) of the lubricant
• Optimal for vertical unit application
• Very narrow axial design
• Reliable sealing of the housing bore etc.

Application

• Industrial gearboxes.

Material

Acrylonitrile-butadiene rubber/Fluoro elastomer

Fluoro elastomer/ Fluoro elastomer

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• Outer casing: metal, machined
• Metal insert
• Spring-loaded sealing lip
• Additional dust lip (B2…SL)
• Sealing lip profile, sealing lip machined on the front face
• Sealing lip profile, finished sealing lip (B2 FUD/B2 FUDSL).

Product advantages

• Broad range of applications in every sector of industry
• For larger dimensions and with rough fitting in the locating bore
• Additional dust lip as additional seal against moderate to medium dust and dirt ingress (B2…SL) (NOTE: can lead to temperature increase from frictional heat)

Application

• Heavy industry

Material

Acrylonitrile-butadiene rubber

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• Outer casing: elastomer
• Spring-loaded sealing lip
• Additional dust lip (BA…SL)
• Sealing lip profile, sealing lip machined on the front face
• Sealing lip profile, finished sealing lip (BA FUDX7/BA FUDSLX7).

Product advantages

• Broad range of applications in every sector of industry
• Reliable sealing of the housing bore, even with increased roughness of the bore, thermal expansion and split housings thus a sealing of low viscosity and gaseous media also possible
• Additional dust lip as additional seal against moderate to medium dust and dirt ingress from outside (BA…SL) (NOTE: can lead to temperature increase from frictional heat).

Application

• Industrial gearboxes
• Axles (when subject to moderate dirt)
• Power tools.

Material

Acrylonitrile-butadiene rubber

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• Outer casing: elastomer
• Short flexible, spring-loaded sealing lip
• Additional dust lip.

Product advantages

• Used preferably in pressurized units
• Reliable sealing of the housing bore, even with increased roughness of the bore, thermal expansion and split housings
• Advantages when sealing low viscosity and gaseous media
• Increased thermal stability and chemical resistance when 75 FKM 595 is used
• Additional dust lip as additional seal against moderate to medium dust and dirt ingress from outside
• Small axial dimensions.

Application

• Hydrostatic drives(pumps, engines of all kinds)
• 2-stroke engines

Material

Acrylonitrile-butadiene rubber

Fluoro elastomer

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• Outer casing: metal, machined
• Spring-loaded sealing lip
• Additional dust lip (B1…SL)
• Sealing lip profile, sealing lip machined on the front face
• Sealing lip profile, finished sealing lip (B1 FUD/B1 FUDSL).

Product advantages

• Broad range of applications in every sector of industry
• Metal housing for specially firm and precise seating in the bore
• Additional dust lip as additional seal against moderate to medium dust and dirt ingress from outside (B1 FUDSL) (NOTE: can lead to temperature increase from frictional heat).

Application

• Industrial gearboxes
• Axles (when subject to moderate dirt)
• Power tools.

Material

Acrylonitrile-butadiene rubber

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