FST Automotive

Closer to the vision


FST Automotive Levitex

From Kyoto to Weinheim


The leader in innovative seals for cars and commercial vehicles

Freudenberg Sealing Technologies Automotive supports the industry’s efforts to achieve greater efficiency and reduced emissions.

Freudenberg Sealing Technologies Automotive, a market leader in the auto industry’s technology, quality and service segments, provides a wide range of products to all the major automobile and commercial vehicle manufacturers worldwide. The portfolio includes a large assortment of seals – ranging from O-Rings to bidirectional, low-friction Cassette Seals.

FST Automotive

Freudenberg Sealing Technologies Automotive offers cutting-edge research, absolute perfection in manufacturing, and outstanding customer service. This results in sealing solutions for cars and commercial vehicles that can be seamlessly integrated into the latest vehicle developments, including engines, transmissions, suspensions, steering systems, drivetrains, climate control, brakes, fuel systems, electrification and turbochargers.

Ice truck

We are a supplier to all the important vehicle manufacturers worldwide, whether our contribution is an individual, standard engine seal or a component system developed to meet a particular requirement. You always receive parts at the highest level as well as comprehensive expertise. Whether the sale involves just a single seal or a million seals. Along with longevity, efficiency and TCO, the relevant issues for commercial vehicles are the varying requirements across regions – especially when compared to passenger cars – and exhaust gas after-treatment to reduce nitrogen oxides (SCR)

Furthermore, our customers have direct access to a wide-ranging network of global research and development facilities, an extensive assortment of materials, technical experts and manufacturing specialists. In cooperation with our OEM customers, the Freudenberg Sealing Technologies Automotive team is ready to assist you with the implementation – even when your requirements are unique. 


Innovation Levitex

The engineers at Freudenberg Sealing Technologies have come very close to the vision of a frictionless seal: The Levitex crankshaft seal creates an air cushion that seals the engine compartment with virtually no friction.

Freudenberg Sealing Technologies Automotive Landingpages

More information about sealing solutions for cars and commercial vehicles:

Engine of technical process 
Transmission innovation in high gear 
Levitex - the frictionless revolution

Diesel Sealing Solutions

Brochure Diesel Sealing Solutions

The Freudenberg product range offers more than 16,000 standard products and a multitude of customer-specific solutions, with outstanding seals and vibration control for all diesel power plant components.


The shift in emphasis seems unstoppable. Primarily development in Asia will drive the global growth that experts expect in the truck and bus market.
The shift in emphasis seems unstoppable. Primarily development in Asia will drive the global growth that experts expect in the truck and bus market.
The Freudenberg product range offers more than 16,000 standard products and a multitude of customer-specific solutions, with outstanding seals and vibration control for all diesel power plant components.
With its unique portfolio of products and services, Freudenberg Sealing Technologies is one of the world’s leading specialists in the sealing and accumulator field.
From the electrification of the power train to boosting charging speed, safety, and comfort, we can shape the technological change together.
Sealing technology opens up enormous potential for the mobility of today and tomorrow. The LESS brochure presents it vividly and clearly.

Sales sheets

Pressure Management Solution
Turbocharged gasoline and diesel engines contribute to a drop in CO2 emissions while the engine output is held constant.

Relevant products and applications in this market segment

FST Dynamische Dichtungen Dynamic Seals

Dynamic Seals

Portfolio Freudenberg Sealing Technologies

FST Produktvariante

Damper and Steering Seals

Premium quality oil seals for dynamic, static, reciprocating and rotational applications for the world’s leading automotive suppliers and OEMs.

Dynamic Seals

Valve Stem Seals

Freudenberg Sealing Technologies Valve Stem Seals control leak rate for the life of the engine to assure correct guide lubrication while avoiding excessive oil consumption.

FST Static Seals Statische Dichtungen

Static Seals

Portfolio Freudenberg Sealing Technologies



Gaskets produced by Freudenberg Sealing Technologies are designed as an integral part of a sealed system.

FST Static Seals Statische Dichtungen O-Ringe O-rings


Endless O-Rings with a circular cross-section: O-Rings are among the sealing classics par excellence.

FST Special Seals Spezialdichtungen

Special sealing products

Portfolio Freudenberg Sealing Technologies

FST Boots


Single- and multiple-convolution boots are protective seals for socket joints, ball joints and articulated shafts.

FST Caps


Sealing Caps from Freudenberg Sealing Technologies provide the secure sealing of round borings in housings and are available in a great many different versions.

FST Forseals


Forseal seals from Freudenberg Sealing Technologies are groove-ring-like seals for pistons and rods that can be pressurized on one side.

FST Diaphragms


Diaphragms may be used in an array of applications, including pumps, actuators, hydro-accumulators, valves, and regulators.

FST Plug and Seal

Plug & Seal

Plug & Seal connectors are pipe sections that are rubberized on their exterior surfaces, with two sealing beads and shock absorbers.

Freudenberg Sealing Technologies Driveline


Driveline: Simmerrings®, cassette seals and bellows act in concert for less noise and vibration.

The power train: driven by durability

Seals by Freudenberg Sealing Technologies also provide the power train with innovative solutions that stand out due to perfect quality and excellent economic efficiency. Modern sealing technology in the power train makes it possible to minimize noise and vibrations, thus increasing the durability of the entire vehicle. Power train seals have to be reliable, robust and durable. And that’s what Freudenberg Sealing Technologies’s Simmerrings®, cassette seals and joint bellows really are! 

Material competence for media resistance: for example, the cassettes seal excellently against oil and grease and build a reliable protection against, dirt, mud and sand. The joint bellow even combines two functions in one component: in addition to sealing and protecting the constant-velocity universal joint against external impact, the bellow also compensates for the movements of the shaft and the casing.

Freudenberg Sealing Technologies Safety Systems

Safety Systems

Safety Systems: Seals for pneumatic brake systems enable heavyweights to stop safely and reliably.

Stand still! 

U-rings, diaphragms, rubber-plastic components for pneumatic brakes underline the importance of production precision and profound knowledge in material and process engineering. When it comes to brakes, highest quality standards, maximum process control and a zero-defect philosophy play a vital role in the truest sense of the word. Function safety is the be-all and end-all to also reliably bring heavyweights to a standstill.

With its state-of-the-art analysis and calculation methods, Freudenberg Sealing Technologies is a respected partner in the development of seals for pneumatic brake systems – not only today but also tomorrow. Because one thing is true: despite electronic brake assistant systems and an increasing electrification, there is no way around the pneumatic brake and first-class seals for these systems.

Freudenberg Sealing Technologies E-Mobility


E-mobility - Seals by Freudenberg Sealing Technologies: experiencing tomorrow’s technology.

All over the world, e-mobility is in the fast lane. Increasing costs for fossil fuels and increasingly stricter emission provisions are accelerating this trend. And, as in conventional driving concepts, seals by Freudenberg Automotive also play an important part when it comes to e-mobility: you rarely see them but you can never do without them. 

In general as seals used in battery technology, or specifically as gaskets for battery casings or for plug & seal applications using sensor technology in the battery’s thermal management. In electric motors and inverters, breathable pressure compensation elements serve to prevent contact corrosion. And seals by Freudenberg Automotive are also the “driving force” in the area of hybrid technology.

As a member of the Freudenberg Group, the company maintains a close technology partnership with other business areas. This interdisciplinary cooperation results in sophisticated solutions that ensure future mobility – including sealing concepts for fuel cells.

Freudenberg Sealing Technologies Electrification


Electrification: Freudenberg Sealing Technologies supports the trend towards the electrification of automobiles – with space-saving seals and other innovative solutions.

E for Electrification

From A for Actively Controlled Ride Systems or Assistant Systems to W for Windscreen Wipers: the electrification of automobiles is on the rise and is increasing driving comfort and safety. In addition, electronic assistance is also opening up new possibilities, e.g. in modern engine management, to combine driving pleasure and dynamics with efficiency and reduced emissions. Freudenberg Sealing Technologies supports this irresistible trend towards electrification with tailored space-saving seals. Mechatronic solutions result in intelligent sealing concepts. In-depth material knowledge plays a decisive role in this process: not only with respect to elastomers but also, for example, concerning liquid silicone rubber and 2-component parts made of silicone-thermoplastic compounds. These include plug connections and sealing mats as well as casing covers with integrated additional functions, such as vibration absorption or sealing.

Freudenberg Sealing Technologies Suspension


Suspension - on the road: innovative chassis seals for friction optimization and emission reduction.

The chassis: dynamics through precision

The fine art of chassis design consists of harmonizing dynamics, stability and comfort. Potholes can be smoothed out and bumps are no longer an obstacle to safe driving and comfort. Friction-minimized chassis seals by Freudenberg Sealing Technologies make an important contribution to this: the lower the friction value in the bumper seal, the more precise the chassis design. This principle applies to passive and active chassis systems in equal measure.

The basis of this high-precision work is Freudenberg Sealing Technologies’ unique material knowhow. The right seal for any chassis: whether in tropical heat or Siberian cold – Freudenberg Sealing Technologies has a reliable and durable material solution for any climatic challenge, e.g. specifically developed low-temperature materials. A network of development and production centers in Europe, America and Asia ensure our products’ availability for customers all over the world.

Freudenberg Sealing Technologies Transmission


Transmission: Friction-optimized, low-emission transmission seals ensure the mobility of tomorrow.

Driving innovation

With its seals for manual and automatic transmission systems, Freudenberg Sealing Technologies has been leading the field for many decades. On its way to ensuring our future mobility, the sealing specialist has used its friction-minimized and low-emission transmission seals to shift up a gear. Whether 4-step hybrid, 7-step double-clutch transmission systems or innovative seals for 8/9-step automatic transmission systems: Freudenberg Sealing Technologies drives innovation in the transmission technology.

The wide variety of seals for transmission systems ranges from Casco Simmerrings® up to the extremely friction-reduced quantum seal for hydraulic circuits. Another example of these Low Emission Sealing Solutions (LESS) by Freudenberg Sealing Technologies are piston accumulators for hydraulic double-clutch transmission systems. They combine the automotive industry’s requirements on fuel consumption and weight reduction with an extraordinarily long service life. At the same time, they can also be used very economically and reliably in start/stop applications in any automatic transmission system.

› Further information

Freudenberg Sealing Technologies Climate


Climate: Seals in air conditioning systems keep coolants where they belong: in the air-conditioning system.

The air conditioning: classy climate control

Environmentally compatible coolants make new requirements on the material and design of seals in air conditioning systems. Freudenberg Sealing Technologies has developed a range of perfectly designed seals both for the HFO 1234yf coolant selected by the European automotive industry and the R744, its alternative. 

Since these coolants are expensive it is important to minimize the leakage rate: by using air-conditioning seals by Freudenberg Sealing Technologies. Their largest benefit is the high function reliability. This applies to O-rings as well as Simmerrings® and service valves. And don’t forget: whether for the HFO 1234yf or the R744 coolant – all of our seals make a contribution to increasing the efficiency of the air conditioning, thus reducing CO2 emissions. That’s what we call classy climate control.

Freudenberg Sealing Technologies Engine


Fuel - Systematic variety: Freudenberg Sealing Technologies provides seals for fuel systems and the whole range of alternative fuels.

Top-quality alternatives


Fuel is the blood in an automobile’s veins and Freudenberg Sealing Technologies accompanies it on its path from the gas cap to the injection nozzle, irrespective of whether it is gas, biodiesel, flex-fuel, CNG or LPG that makes the automobile’s heart beat: Freudenberg Sealing Technologies offers a wide range of materials and sealing solutions, which are reliably resistant against all types of fuel. 

For example, a seal for fuel systems: the innovative RFN coating of new gas cap seals reduces friction and increases service life. In the engine, Freudenberg Sealing Technologies is responding to the trend towards high-pressure direct injection pumps. The range of state-of-the-art seals for fuel systems includes injector seals made of extremely resistant PTFE.

Freudenberg Sealing Technologies Steering


Steering: Path-breaking steering seals by Freudenberg Sealing Technologies set the course for tomorrow’s mobility.

Setting the direction

Modern hydraulic and electric steering systems are real all-rounders: they make it possible for the driver to manage parking maneuvers with nothing but his little finger on the steering wheel. At the same time, the steering conveys a feeling of security, stability and road safety while driving at a high speeds. Steering seals by Freudenberg Sealing Technologies make an important contribution to this and set the direction for the future. 

When it comes to seals for steering systems, the sealing specialist focuses all of its activities on friction minimization, efficiency, a long service life and maximum installation safety. Whether steering bellows, end-stop dampers, Simmerrings® on the rack or in valves – steering seals by Freudenberg Sealing Technologies have been optimally designed for the specific characteristics of the individual component group and drive technology.

Freudenberg Sealing Technologies Engine


Engine: Friction-optimized and low-emission engines seals from the LESS program set the pace for automotive progress.

A quantum leap forward

Hybrid systems and e-drive are all well and good but for the time being, powerful, low-emission and fuel-efficient combustion engines continue to set the pace in automotive progress. Friction-minimized engine seals point the way forward for conventional drive technology. Freudenberg Sealing Technologies’ Low Emission Sealing Solutions (LESS) help to optimize combustion, reduce consumption and emissions and, thus, ensure our future mobility. They meet the automotive manufacturers’ requirements, the drivers’ wishes and the legislative provisions in equal measure.

Some examples: among the emission-reducing engine seals, the Energy Saving Simmerring® (ESS) has become a synonym for high performance at low friction. The gas-lubricated Levitex® crankshaft seal has been developed to realize an almost friction-less sealing solution in engines. And when it comes to the optimization of variable valve control, Freudenberg Sealing Technologies with its quantum seals has, in the truest sense of the word, made a real quantum leap forward.

› Further information

Freudenberg Sealing Technologies Turbocharging


Turbocharging: Low Emission Sealing Solutions (LESS) for downsizing concepts combine more performance with less consumption.

The turbocharger: Less is more

Small, light engines make it big. The formula: more performance with less consumption. The motto: downsizing. Efficient capacity-reduced engines make it possible to lower the emission of CO2 and other exhaust gases.

Freudenberg Sealing Technologies’ Low Emission Sealing Solutions (LESS) combine numerous intelligent product innovations for downsizing concepts. In addition to lightweight design and optimized engine control, turbochargers play an important role as well. In this respect, it also pays to use Freudenberg Sealing Technologies’ unique material competence when it comes to seals for engines and turbochargers.

Friction-minimized and low-emission engine seals by Freudenberg Sealing Technologies stand out not only for their excellent performance but also for their durability.


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