FST Process Industries Chemical
Freudenberg Sealing Technologies Chemical Plant

Process Industry

Chemical

Solutions for especially demanding applications

High-performance seals for the chemical industry

Aggressive, sometimes toxic media, high pressures as well as extreme temperatures and temperature fluctuations – seals face special challenges in the extraction of chemicals and their processing into high-value finished products. Specifications for purity and hygiene, the required approvals and stringent statutory emissions limits tighten the requirements profile even more.

For this challenge, Freudenberg Sealing Technologies has turned to the unique material expertise that it has continually developed over decades. Only high-performance, quality solutions can reliably safeguard processes in the chemical industry. This applies as much to the processing of inorganic basic chemicals as to fine and special chemicals or the handling of petrochemicals and derivatives.


Steam cracking

Freudenberg Sealing Technologies Process Industry

One example from the petrochemical industry highlights the challenge: In steam cracking, raw materials are produced that are further processed into plastics, paints, solvents and pesticides. With steam cracking, temperatures range up to +850 degrees Celsius. But the actual challenge to seals is still looming: it is the severe temperature change for the subsequent cooling of the vapor. The pressure also increases to about 30 bar with the compression of the cracked gas.

In the processing of fine and special chemicals processing, extreme temperature fluctuations – ranging from +300 degrees Celsius down to low temperatures – are not unusual in crystallization processes either.


Highly resistant material and sealing solutions

Freudenberg Sealing Technologies offers robust, high-performance material and sealing solutions for these tasks. For example, it offers a comprehensive range of flat gaskets that are highly resistant thermally and chemically for the lines and flange connections that are often used in the chemical industry. Due to its multifaceted experience in the pharmaceutical industry, Freudenberg Sealing Technologies is extremely familiar with the requirements for hygiene, design and approvals in the production of laundry detergents and personal care products.


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Freudenberg offers highly resistant sealing solutions made of plastics such as PTFE, as well as a wide range of high-quality materials such as perfluoroelastomers (Simriz®), EPDM or FKM, if elastomeric flexibility in less aggressive production environments is required.

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Demanding applications in the process industry require specific know-how and well-founded materials expertise. Apart from a broad product range, Freudenberg also offers specific materials with international approvals such as FDA, USP Class VI, NSF and regulation (EU) 1935/2004, as well as seals based on hygienic design.

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Sealing solutions specially developed for the process industry in accordance with hygienic design and materials with industry-specific approvals.

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High performance materials for the extreme requirements in the Process Industry

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The premium universal material for the processing industry. A wide variety of applications that are impressive right down the line: Fluoroprene XP is the universal sealing material for steam sterilization, aggressive CIP-/SIP-media and high-fat concentrations.

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Clamp seals make fast and secure flange connections in continuously operating equipment. Due to their symmetrical geometry, the clamp connections can be mounted and re-separated very easily.

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Flat Gaskets primarily provide the static sealing of two sealing surfaces. They are frequently flange connections, for example for a tubing system.

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With its outstanding qualities in critical media, our EPDM materials are the first choice for a wide variety of O-rings, formed parts and diaphragm applications in the food, beverage, pharmaceutical and chemical industries.

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FKM (fluororubber) is a high-quality material that can be used in the entire processing industry.

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Freudenberg Xpress - quality in record time

Relevant products and applications in this market segment

FST Dynamische Dichtungen Dynamic Seals
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Dynamic Seals

Portfolio Freudenberg Sealing Technologies

Dynamic Seals

Rod Seals

Rod Seals are primarily used in pneumatic and hydraulic cylinders and have the task of sealing the incoming and outgoing cylinder rod.

Führungen

Guide Rings

Guide Rings have the task of guiding the rods and pistons of pneumatic and hydraulic cylinders and preventing direct metallic contact with the cylinder housing.

FST Dynamische Dichtungen Dynamic Seals Dreh-/Schwenkdichtungen Pivoting Motion

Rotary and Swivel Seals

It is the combination of operating conditions that put Rotary and Swivel Seals to the test. They must withstand pressure loads similar to those in hydraulic cylinders.

FST Dynamische Dichtungen Dynamic Seals Kolbendichtungen Piston Seals

Piston Seals

Piston Seals in pneumatic and hydraulic cylinders have the task of sealing the piston against the cylinder tube.

Dynamic Seals

Wipers

Wipers in pneumatic and hydraulic cylinders protect the interior of the cylinder from the penetration of external contaminants when the rod is retracted.

Dynamic Seals

Radiamatics

The requirements are high. Freedom from leakage is not only a "must" for drive shafts in shipping. Cleanliness is also of utmost importance in the paper industry with its high-speed rolls.

FST Static Seals Statische Dichtungen
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Static Seals

Portfolio Freudenberg Sealing Technologies

FST Static Seals Statische Dichtungen O-Ringe O-rings

O-Rings

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

FST Flachdichtungen

Flat Gaskets

Flat Gaskets provide the static sealing of two sealing surfaces.

FST Deckeldichtungen Cover Seals

Cover Seals

Even if machine elements under pressure are firmly bolted to one another, there is still a so-called static seal gap that must be sealed.

Hygiene Usit Ring

Usit Rings

Designed in compliance with hygienic standards, the Freudenberg Sealing Technologies Hygienic Usit Ring with an elastomer bead is setting new purity benchmarks in the processing industry.

FST Special Seals Spezialdichtungen
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Special sealing products

Portfolio Freudenberg Sealing Technologies

FST Precision Molded Parts

Precision Molded Parts

Precision Molded Parts consist wholly of elastomer materials and offer high precision, tight dimensional tolerances and high surface quality.

FST Diaphragms

Diaphragms

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

FST Special Seals Spezialdichtungen Stopfbuchspackungen Stuffing Box Packings

Stuffing Box Packings

So-called Stuffing Box Packings have been tried-and-tested for extremely high temperatures and chemical resistance in pump and valve applications.

FST Butterfly Valve Seal

Butterfly Valve Seals

Hygienic and functionally secure even after countless switching operations.

FST Boots

Boots

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

FST Applications
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Pumps

To be able to move the wide range of types and quantities of media to be conveyed reliably and if possible, without process interruptions, among other things, you really can not do without the sealing technology that is precisely designed to meet your requirements.

Pumps are used anywhere in the processing industry that liquid media is being conveyed. To be able to move the wide range of types and quantities of media to be conveyed reliably and if possible, without process interruptions, among other things, you really can not do without the sealing technology offered by Freudenberg Sealing Technologies that is precisely designed to meet your requirements.


A pump is an aggregate, used to convey liquids. Among the liquids are mixtures as well as liquids with solid and / or gas fractions. Depending on the application, for example in chemically aggressive media or foods, and with different delivery volumes, pumps need to be constructed and dimensioned in completely different ways. In particular this also applies for seals in the aggregates because only if the seals are optimally designed for the applications and types of pumps is smooth operation possible.


Freudenberg Sealing Technologies can look back on many years of experience in sealing pumps. We offer you leading expertise in the development and design of materials and geometries and a product range for oscillating displacement pumps that is based on this, such as Piston pumps, Diaphragm pumps as well as flow pumps, also referred to as Centrifugal pumps.


This means you can take advantage of our comprehensive sealing engineering range of products covering all applications, or why not benefit from our know-how in the development phase of the aggregate for specific designs.

FST Applications
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Valves

Valves are absolutely key to regulating media flow of all kinds in the processing industry. And that is why the valves themselves and the sealing technology integrated in them are of huge importance for ensuring smooth production sequences.

Valves are absolutely key to regulating media flow of all kinds in the processing industry. And that is why the valves themselves and the sealing technology integrated in them are of huge importance for ensuring smooth production sequences. With its range of valve seals, Freudenberg Sealing Technologies completely covers all types of construction used and offers leading sealing performance for uncompromising functional security in every application.
FST Applications
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Separators

Separators and decanters are used to separate liquids and solids and work on the principle of a centrifuge. The high speeds of rotation in these systems require particularly robust and yet precise sealing solutions.

Separators and decanters are used to separate liquids and solids and work on the principle of a centrifuge. The high speeds of rotation in these systems require particularly robust and yet precise sealing solutions.


Separators and decanters work at extremely high rotational speeds to separate out solids and to dispose of these by means of submersible components or continuous feed through a screw conveyor.


In both systems, the rotating components which are also extremely heavy, need to be reliably sealed off. Furthermore, in a separator, components are shifted axially under high pressure to expel the solids. These components need to be really leak-tight against each other and against the housing respectively.


The rotating and axially shifting sealing points require top class seals and top class material. This is why Freudenberg Sealing Technologies uses elastomer materials of different degrees of hardness, depending on the load and the medium used. In the case of the highest mechanical loads, particularly in the area of the exit slits in separators, we offer particularly robust polyamides as the sealing material.

FST Applications
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Homogenizers

Homogenizers are used particularly in the food industry to improve the shelf life of products. Dynamic seals are the most important sealing element in these plunger pumps that are required to build up the pressure.

Homogenizers are used particularly in the food industry to improve the shelf life of products. Dynamic seals are the most important sealing element in these plunger pumps that are required to build up the pressure.


In principle, homogenizers are made up of a plunger pump to generate the pressure in the liquid and an adjustable expansion nozzle. The high pressure expansion disperses particles in the suspension, or drops in an emulsion, thus homogenizing them. In the food industry, homogenizers are used on a large scale to increase the shelf life of milk. Here, a piston pump is used to generate a high pressure of several 100 bar and the milk is squeezed through fine nozzles. While passing through the nozzle, the fat droplets are dispersed from approx. 20 µm to approx. 2 µm which makes the emulsion stable and stops the cream from rising.


For high pressure plunger pumps to work, dynamic seals are essential. Here, Freudenberg Sealing Technologies primarily uses V-Seal Set packings. But the most popular static sealing elements in the food industry, such as O-rings and molded parts, are also used in homogenizers.

FST Applications
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Mechanical Seals

The seal within the seal – for mechanical seals to be able to seal rotating shafts under high pressures, they need a spectrum of so-called secondary seals precisely designed for the application so that they are able to develop their full effectiveness.

The seal within the seal – for mechanical seals to be able to seal rotating shafts under high pressures, they need a spectrum of so-called secondary seals precisely designed for the application so that they are able to develop their full effectiveness.


In contrast to a conventional radial shaft seal, mechanical seals can also reliably seal against the shaft under very high pressures. Providing that a suitable secondary seal has been integrated, because due to the operating principle of the mechanical seal, additional sealing elements are required - which play just as important a part as the main slip surfaces of this sealing system.


The seal ring sliding axially on the shaft need to be sealed against the shaft. This can be done with an O-ring, a pressure sleeve or roll bellows. The counter ring also has to be sealed against the housing. An O-ring generally does the job here.


Freudenberg Sealing Technologies offers all necessary secondary seals in numerous different types of material, both as standard parts according to popular industrial standards and also in the shape of individually designed sealing elements.

FST Applications
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Fittings

Among the vast number of fittings for pipe joints, both flange and screw connections require customized sealing solutions to ensure reliable and easy maintenance sealing of pipe joints.

Among the vast number of fittings for pipe joints, both flange and screw connections require customized sealing solutions to ensure reliable and easy maintenance sealing of pipe joints. 


Apart from piping, valves and accessories, fittings are an important component in pipelines. The connection between the pipe and the fitting can be made in several different ways. There are seal-free welding, brazing and glued joints, but also clamp connections, flange connections and screw couplings which need to be made secure from a sealing engineering point of view.


Depending on the type of fitting and the flowing medium, various sealing materials and shapes need to be considered. Only then is it possible to attain optimal sealing results and the associated system security. In this area, Freudenberg Sealing Technologies offers industry-specific solutions for a wide range of applications. In the chemical industry with large flow diameters, high temperatures and aggressive media this solution is provided by flange connections with a flat gasket, in the cosmetics industry and uncritical food and pharmaceutical applications, it is provided by dairy couplings or clamp connections. And for sensitive areas with stringent hygienic design requirements, our aseptic clamp connections in accordance with DIN 11864 are used.

FST Applications
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Bottling applications

Bottling equipment involves complex systems with many components. Besides parts such as fill heads and rinsing caps that are typical of the application, there are classic components such as media supply inlets, needle guides and valves.

Bottling equipment involves complex systems with many components. Besides parts such as fill heads and rinsing caps that are typical of the application, there are classic components such as media supply inlets, needle guides and valves. In this respect, the entire spectrum of seals from O-rings, formed parts, diaphragms and groove rings –  to cite just a few – is represented in bottling applications.
FST Applications
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Mixers and stirrers

Rotating shafts definitely must be sealed. As a result, dynamic seals in the form of HTSII (or O-rings as a component of a mechanical seal) come into use.

Rotating shafts definitely must be sealed. As a result, dynamic seals in the form of HTSII (or O-rings as a component of a mechanical seal) come into use. Mixing and stirring applications also employ guides, wipers and packings. Frame seals are needed when a mixer with a cover is carried out. For outlet valves, the appropriate seals are needed, as is the case for inlet valves (ball valves, slide valves or similar elements).
FST Applications
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Frames

Frames cannot generally be sealed with O-rings or formed parts since the grooves available for use are relatively narrow but encompass a comparatively large space.

Frames cannot generally be sealed with O-rings or formed parts since the grooves available for use are relatively narrow but encompass a comparatively large space. The seal takes the form of profiles that can be tailored to a precise fit and inserted. If desired, the elastomer profiles can be designed to be hollow and then used as an inflatable seal, e.g. for oven doors.  ePTFE in the form of a joint sealant (FG-360) is available as an alternative.
FST Applications
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Sensors

Measured values from production processes are determined with sensors that are usually sealed statically.

Measured values from production processes are determined with sensors that are usually sealed statically. O-rings and formed parts are the most common types of seals. The formed parts are not solely pure elastomer products but also take the form of composite materials, for example, in combination with metal.