Tag Archives: Freudenberg Sealing Technologies

Case Study: 3-A® Compliant Rod Seal Capable of Handling High-Pressure

Valves are indispensable components in the hygienically sensitive systems used in the food, beverage and pharmaceutical industries. Until now, there were no high-pressure valves available for food-product contact applications that conformed to 3-A® standards. These global hygiene standards address the design and manufacturing of components that come into contact with food.

Bardiani Valvole approached Gallagher’s partner, Freudenberg Sealing Technologies, for help in developing a solution to tap into its material expertise. As a result of joint cooperation, Freudenberg engineers developed a main rod seal that was both 3-A® compliant and capable of handling high-pressure of up to 2175 psi (150 bar) that the customer’s valve required. The main rod seal incorporates proven Freudenberg technology with advanced component design in an entirely new combination that is also compatible with other industrial high-pressure valves.

picture of valve example
Copyright: Bardiani Valvole Spa

Prototypes produced without any tools

The 3-A® compliant main rod seal combines a sealing lip, manufactured from EPDM 302 or Fluoroprene® XP 43, with a backup ring made of PTFE. Freudenberg’s product engineers were inspired by the design of a proven shaft seal and an O-ring with a backup ring. In order to meet development and cost deadlines, the team initially produced one-off prototypes to share with Bardiani Valvole using the unique capabilities of Freudenberg Xpress®, a fast turnaround, high-quality manufacturing service that can generate custom seals in as little as a day. It offers machined seals made of original materials and original profiles for prototypes, spare parts or economical small series.

By eliminating the need to set up manufacturing tooling to produce sample parts, this results in considerable cost and time advantages for the customer. Thanks to special turning and milling techniques, individual designs can be tuned to exact specifications. The tailor-made sealing solution for the new high-pressure valve could also be produced economically in an extremely short time. The Freudenberg Xpress® Service is represented at numerous Freudenberg sites worldwide, enabling rapid delivery of spare parts, for example.

The seal’s design is free of dead space and prevents residue infiltration from process and cleaning media. It is hygienic, easier to clean, and compliant with all relevant material specifications for food, beverage, and pharmaceutical industry applications. Both materials used have very good thermal resistance and excellent mechanical properties. They also meet the demanding requirements for use in Cleaning in Place and Sterilization in Place (CIP/SIP) processes. Continue reading Case Study: 3-A® Compliant Rod Seal Capable of Handling High-Pressure

Freudenberg’s New Plastic Rotating Bearing

In an innovative first, Freudenberg Sealing Technologies has introduced a machine component that combines a plastic rotating bearing with a seal in a single, precisely matched unit.

The design offers significant weight, cost and friction advantages over separate bearings and seals and also improves the properties of the mated bearings and seals. Freudenberg has validated the advantages of this new component through extensive testing performed in a sensor housing unit including the seal-bearing component.

While mostly hidden from view, seals and bearings are nonetheless important components in automotive and industrial applications. They are key elements in operational safety and performance and their durability must be optimized to prevent system failure. At the same time, these bearings and seals must be small, lightweight and cost efficient in keeping with manufacturers’ efforts to remove cost and weight from vehicles without sacrificing performance.

Freudenberg has resolved this challenge with the introduction of its seal with integrated bearing (SWIB). The company spent two years developing this engineered solution and has successfully tested it in a sensor housing of a an electric power steering (EPS) system installed in an electric powered vehicle.

The sensor records data, like steering angle, which is critical to advanced driver assistance programs like electronic stability control (ESC). The seal inside the housing is responsible for protecting the sensor from the penetration of dust, splash water and other media over the entire service life of the vehicle. Bearings used in the assembly are also important; they must withstand significant mechanical loads – sometimes as much as 3,000 Newton (675 lbs) of radial force when a car drives over a curb with its wheels at an extreme angle.

Integrated system can reduce loads and vibration

picture of FST seal with integrated bearing

Freudenberg Sealing Technologies’ integrated solution offers significant improvements compared with separate bearings and seals. The rigidity of the integrated plastic bearing is higher so that its deflection is reduced by nearly 50 percent when lateral forces are exerted. This reduces the induced vibrations to increase the steering comfort for the driver. The seal, on the other hand, has 35 percent less friction, which reduces resistance during steering – especially important for highly automated driving. The weight of the overall solution is reduced by as much as 80 percent through integration. Freudenberg’s patented plastic bearing plays a major role in achieving these component breakthroughs.

Automotive safety applications are subject to many requirements which individual manufacturers define according to their own specifications. Freudenberg Sealing Technologies used common specifications – a temperature resistance of -40°C to 125 °C (-40°F to 257°F) under mechanical stress, for example – to test its integrated component during the past year. Extreme cases, such as direct exposure to high water pressure, which can occur in practice during engine washing, were also tested. The seal that includes an integrated bearing proved itself in all tests. “We can now commence with customer-specific series development at any time,” says Freudenberg expert Frank Schönberg.

The design offers significant weight, cost and friction advantages

Product experts at Freudenberg Sealing Technologies are already researching additional industrial applications for the new component. In addition to automotive applications, seals with integrated plastic bearings can likely bring benefits to many industrial operations. Freudenberg is also looking to the manufacturing process for further innovation: If the seal/bearing unit is currently still being assembled, it could be produced using new materials in an integrated two-component injection molding process in the future.


The original article can be found on Freudenberg’s website.

 Gallagher Fluid Seals is an authorized distributor of Freudenberg Sealing Technologies. To see if this seal is a right fit for your application, contact our engineering team today.

Freudenberg Announces New Seals and Materials for the Aerospace Industry

Freudenberg Sealing Technologies introduced several new material and sealing innovations at the 2019 International Paris Air Show.

These new products are designed to help aerospace customers address ever increasing safety and performance requirements in the industry.

During the June 17-23 event in Paris, Freudenberg showcased a new high temperature, fireproof material; an Omegat OMS-CS cap seal; and new ethylene propylene diene monomer (EPDM) and a fluoroelastomer (FKM) developmental material.

“Our aerospace customers strive continuously to be faster, safer and more efficient, which in turn requires us to innovate to help them reach those goals – a challenge we enthusiastically embrace,” said Vinay Nilkanth, vice president, Global Mobility Sector, Freudenberg Sealing Technologies. “The launch of several new products aimed at improved performance underscores Freudenberg’s commitment to being a global leader and development partner to the industry.”

Freudenberg’s new proprietary fireproof sealing fabric is made to withstand the extremes. Tested on standard aerospace bulb seals and passing AC20-135 fireproof requirements, the fabric acts as a barrier, providing up to 15 minutes for necessary corrective action. The fabric performs as well as other industry standard solutions but is much more cost effective.

Omegat Cap Seal

For use in dynamic, reciprocating applications where low friction is required, the new Omegat OMS-CS cap seal is a two-piece rod seal set consisting of an engineered polytetrafluoroethylene (PTFE) ring and an O-ring energizer. The seal offers low breakaway and running friction, and is chemically compatible with aerospace fluids and greases. It also provides excellent wear and extrusion characteristics, and has angled blow-by notches and lubrication grooves.

Freudenberg’s new EPDM LM426288 material is for use in low pressure static sealing to -77°C (-106°F) and has excellent resistance to, and swell behavior in, AS1241 phosphate ester hydraulic fluids. The material offers high temperature compression set resistance and short term resistance to 150 °C (302°F) for high temperature hydraulic systems such as hydraulic braking.

The FKM LM426776 material for use in low pressure static sealing to -67°C (-88°F) shows excellent resistance to several aerospace media, including jet turbine and gearbox lubricants, high and low aromatic content jet fuels, and fire resistant hydrocarbon hydraulic fluids. The material offers short-term high temperature resistance to 270°C (518°F) and long-term compression set resistance at 200°C (392°F).


The original article can be found on Freudenberg’s website.

Gallagher Fluid Seals is a preferred distributor of Freudenberg Sealing Technologies. To learn more about Freudenberg products, speak to a Gallagher representative today by calling 1-800-822-4063

Sealing Solutions for Machine Tools

Gallagher Fluid Seals is a long-time partner of Freudenberg Sealing Technologies.  From their classic Simmerring® radial shaft seal, to V-rings, to guide rings, to u-cups, Freudenberg is an innovative seal manufacturer that solves problems.  Check out the video below to see the many sealing elements developed for machine tools, specifically hammer drills and demolition hammers.

Overcoming the toughest resistance with full penetrating power, whether against concrete or stone: hammer drills and demolition hammers literally have a huge impact. Sealing solutions and rubber molded parts from Freudenberg Sealing Technologies are meanwhile essential to them. They robustly and reliably guarantee the machine’s power output and a long lifetime of drilling, chiseling, demolishing and stripping. Freudenberg Sealing Technologies is the leading global market and technology specialist in sealing technology. Seals from Freudenberg Sealing Technologies are employed in a wide range of products. Their industrial applications include machine tools and, as quintessential examples, hammer drills and demolition hammers.

Sealing Systems for Hydraulic Cylinders

Hydraulic Cylinders in High-Load Bearing MaterialsThe right mixture does the trick – even for seals used in hydraulic cylinders. But the optimal interplay of the individual seals is a delicate matter. To save its customers a great deal of time and effort, Freudenberg Sealing Technologies (FST) has developed five preassembled sealing systems. They contain all the components needed for specific customer applications.

Until now, it took extensive experience and even more stamina to assemble a sealing package for hydraulic cylinders. To start with, the selection is huge: The FST catalog offers well more than 100 different rod and piston seals as well as wipers. Moreover, the individual seals have to function in combination, ideally supporting and complementing one another. Due to this mutual influence, every change has an effect on the functionality and performance of neighboring components. The approach to the result is gradual and cautious.

SIMPLER, FASTER, INTEGRATED…

An Entire Solution in a Single Package

Freudenberg takes the customer out of the complex, tedious process of selection, adjustment and modification, providing integral sealing systems. The company has developed so-called ‘application cards’ that specific dedicated sealing systems for selected market segments and their applications. Here FST has gone beyond what is normal among its competitors. It doesn’t merely provide a fraction of all the components needed for hydraulic cylinders – it delivers all of them, from piston guides and seals, to primary and secondary rod seals, all the way to rod guides and wipers – and considers all their interactions in the process. As a result, a specialized knowledge of individual sealing elements is no longer needed. Continue reading Sealing Systems for Hydraulic Cylinders

Seals that Monitor Themselves

Smart Seals - Freudenberg Sealing TechnologiesSeals are increasingly being asked to do more than just seal. In the future, they should be able to forecast when they will break down and perform condition monitoring in real time – all on their own. As a technology specialist, Freudenberg Sealing Technologies is not just anticipating the steadily rising demands on seals but on future sealing materials as well. At Drinktec 2017 in Munich (Germany), the company presented a new generation of smart seals that is becoming possible for the food and process industries, thanks to a combination of various material characteristics.

Seals primarily consist of materials that cannot process signals in their pure form. That’s why Freudenberg Sealing Technologies’ material developers are investigating materials that seals can employ to become sensors or even actuators, for example, without impairing their original mission.

Continue reading Seals that Monitor Themselves

When Things Have to Move Fast – Freudenberg Xpress

What do you do when you need an urgent spare part for a made-to-order seal?  What do you do when special seals are required for a short production run of 400 machines?  It’s hard to know. Here’s where the Freudenberg Xpress® experts come into play.

Freudenberg XpressTimo Furrer oversees Freudenberg Xpress, which now includes 12 facilities worldwide. He and his team are in demand whenever time is pressing or the manufacture of prototypes or short production runs is required. “Customers traditionally turn to us when they need a specific sealing solution fast for maintenance and repair work,” Furrer said. But there are other occasions as well. Freudenberg Xpress experts are also called on when a manufacturer develops new equipment and has to find the best possible sealing systems for it. To avoid costly field tests, the manufacturer tests the limits of various prototypes that Freudenberg Xpress can provide on short notice.

From Tiny to Huge

To these sealing specialists, it doesn’t matter whether their customers need seals with diameters of just two millimeters or a full twenty meters – a size that can be found in wind turbines or hydro-electric plants. Nor does it matter whether the order is for a standard seal or a customer-specific product. “Within 24 hours of the incoming order’s arrival, we can produce and deliver up to 50 units,” Furrer said.

Continue reading When Things Have to Move Fast – Freudenberg Xpress

Lightweight Seals: Innovations With Added Value

Lightweight Design - Ted Duclos Ⓒ Stefan Bausewein
Ⓒ Stefan Bausewein

Lightweight design has recently become a much more significant trend in the auto industry. Even with small components like seals, a great deal of weight can be saved. From Freudenberg’s standpoint, several forward-looking issues come together in these approaches.

In his office, Dr. Ted Duclos, the CTO of Freudenberg Sealing Technologies, is holding up a palm-sized plastic ring.  “I know that it seems very small and insignificant,” he said. “But components like this quickly add up to several kilograms of weight in an engine.” And weight is one of the factors getting special attention from the auto industry – for a range of very different reasons.

Duclos has just returned from the Lightweight Summit in Würzburg, an international gathering of more than 300 experts from industry and research. Specialized lectures, discussion panels and presentations focus on lightweight design in the auto industry and especially in electric mobility. “Lightweight design is a trend,” Duclos said. In the design of classic internal combustion engines because low weight reduces emissions. And for the future of the electric car because reduced weight increases the vehicle’s range. Or to put it another way, lightweight design is one of several trends that are now logically tied to one another.

Continue reading Lightweight Seals: Innovations With Added Value

PTFE as a Sealing Material

Polytetrafluoroethylene (PTFE) is commonly known as a coating for pans under the DuPont trade name Teflon™. It is also superbly suited as a sealant and is superior to many materials in specific ways. For example, it can be used at low and high temperatures and in combination with gasoline, solvents, water and other polar media such as lyes, standard lubricants and brake fluid. PTFE’s chemical resistance is nearly universal.

History

In 1938, while working for DuPont, American chemist Roy Plunkett was looking for a substitute for the fluorohydrocarbon Freon, which his employer was only allowed to sell to General Motors’ Frigidaire division for patent-related reasons. For his research, he had obtained a supply of tetrafluoroethylene (TFE), which was used as refrigerator coolant. He stored it in small pressurized gas cylinders at low temperatures. When he was ready to use the gas after a fairly long storage period, none was left in the container. But its weight was unchanged. After it was opened, there were white crumbs inside and the inner walls of the container were covered with a thin layer. Plunkett quickly realized that the TFE gas had been polymerized into a plastic. This new plastic, PTFE, proved to be completely resistant to chemical exposure. Not even aqua regia¹ could harm it in any way. But its production was so costly that practical uses seemed inconceivable.

PTFE - Used As a Coating on Fishing Lines Continue reading PTFE as a Sealing Material

Avoiding Taste Transfer in Food Production

Anyone who has ever enjoyed a fruit tea out of a mug that previously contained coffee knows the problem: taste transfer. It is an undesirable phenomenon during product changeovers in the food industry.

Taste Transfer - Food Processing

With Fluoroprene XP, a line of premium seal materials, Freudenberg has brought out an all-purpose weapon to handle steam sterilization, aggressive media used for cleaning in place (CIP) and sterilization in place (SIP), and high-fat concentrations. Until now, production processes in the food industry, in particular, have required the use of an extremely wide range of material options. Depending on the fat, flavor or acid concentrations in the food, and the specifications of the CIP/SIP processes and steam sterilization, seals made from EPDM, VMQ or FKM are used.

Continue reading Avoiding Taste Transfer in Food Production