Freudenberg Sealing
- April 27, 2017
Seals and molded rubber technical parts are mostly given their form in closed molds. The rubber mixture is heated inside them so that vulcanization and solidification can take place. After a very precisely defined heating time, the degree of cross-linking reaches its maximum level. Then the mold can be opened and the component removed.
There are many different molding processes. The most important of them – and the ones most frequently used at Freudenberg Sealing Technologies (FST) – are listed here.
Compression Molding
Compression molding is one of the oldest ways to manufacture technical elastomer components. First, a blank is manufactured that is large enough to fill out the form of the component being produced. It is inserted into the component mold in the tool (tool cavity). The component is given its form by closing the tool in the press. Due to the heat of the heating plate in the press, high pressure builds up inside the tool due to thermal expansion, and the vulcanization process is initiated. - April 06, 2017
Freudenberg Sealing Technologies has more than 1,500 elastomer mixtures, each created to suit a variety of different operating parameters. But where does the raw material for your Silicone, Fluoro, or Perfluoroelastomer seal come from, and how does it start the process of becoming a seal?
Elastomers are multi-component systems that are composed of up to 15 different raw materials. Given their very different weight proportions and an extremely wide range of textures, the individual raw materials must be mixed together homogeneously. While rubber is delivered in ball or chip form and is only capable of flowing at the processing temperature, softeners are generally present in the form of flowable oils. The goal of mixing is to distribute all the required raw materials evenly within the polymer matrix and to break up agglomerates to allow the optimal bonding of the filler particles to the polymer. For the most part, the variety of different components cannot be incorporated in a single work step. This is particularly true for mixtures that contain fine soots or natural rubber as their polymer base.
- March 23, 2017
The spectrum of elastomers range from very simple forms, like the natural rubber already in use in the 19th century, to modern, high performance elastomers from the second half of the 20th century. They are continually being improved.
This blog article is the second in a two-part series discussing the many different elastomer materials available today, as discussed in Freudenberg's The World of Freudenberg Sealing Technologies.
The first post discussed Natural Rubber (NR), Nitrile Rubber (NBR), and Hydrogenated Nitrile Rubber (HNBR).Polyacrylate Rubber (ACM)
ACM elastomers are made of polar acrylic acids. As polar materials, they display good resistance to high-additive lubricating oils. Due to its saturated¹ main chain, the material exhibits good resistance to ozone, weather and heated air. Petroleum-based oils and fluids (for engines, transmissions and automatic transmissions) cannot harm them. But the material offers only moderate strength and low elasticity while displaying limited cold behavior. - March 02, 2017
The spectrum of elastomers range from very simple forms, like the natural rubber already in use in the 19th century, to modern, high performance elastomers from the second half of the 20th century. They are continually being improved.
This blog article will be the first in a two-part series discussing the many different elastomer materials available today, as discussed in Freudenberg's The World of Freudenberg Sealing Technologies.
Natural Rubber (NR)
In its original form, latex is greasy and sticky. Natural rubber is an elastic polymer, built on isoprene as its monomer. To make it usable technically, the long polyisoprene chains of natural rubber are cross-linked with one another through vulcanization – which involves the addition of sulfur under pressure and heat.In the process, sulfur atoms insert themselves between the double bonds of adjacent chain molecules – the majority of the double bonds are maintained. The result is a three-dimensional molecule network whose parts can only shift against one another within certain limits.
- February 14, 2017
Gallagher Fluid Seals is a longtime distributor of Freudenberg Sealing Technologies, a market and technology leader in many sectors - including mobile machinery for the agriculture and forestry, construction and mining industries. Decades of experience in manufacturing, the art of materials, and continuous innovations flow into Freudenberg's unique product portfolio.
Mobile machinery has to manage very difficult environmental conditions, such as moisture, rough weather, huge temperature fluctuations, UV-radiation, not to mention sand, mud, and ozone. Cassette seals from Freudenberg Sealing Technologies persevere for long service life. Watch the video below to see how Freudenberg cassette seals can be implemented in mobile machinery.
[embed]https://www.youtube.com/watch?v=5Yzs33ImZMY[/embed]
- January 24, 2017
In order to tell the story of the Freudenberg Simmerring we need to go back in the days of the Roman Empire.
That's where Freudenberg begins in its history of these sealing products:
Even in ancient times, water was considered one of the costliest commodities. It was the job of engineers to find ways to transport the valuable liquid from its sources into the cities with minimal loss – often over hundreds of kilometers.
The explosive growth of metropolises would have been inconceivable without a secure supply of water – after all, the daily per capita consumption around 100 A.D. was nearly three times what it is during the 21st century.
Lead pipes in a casing of “Roman concrete” were mostly used in ancient Greek and Roman water lines. The efficient integration of these elements required special care. The sealing of the difficult-to-maintain pressure pipelines therefore required several layers of mortar.
- December 03, 2016
Customers often come to Gallagher Fluid Seals with the need for very short lead times for a seal.
Whether it is a piece of equipment that is down or a need for quick prototypes, Gallagher can assist you in developing the required seal profile and material for your application. We can have parts in your hands within 24 hours if necessary.
Our work is made possibly by the help of valued partners such as Freudenberg Sealing Technologies.
Watch the video above to learn more about the capabilities of Freudenberg Xpress cell.
- October 27, 2016
Gallagher is a longtime partner of Freudenberg Sealing Technologies (FST). Over the years, we have represented their many brands within the sealing industry, sealing hundreds of different applications.
One such application is a rod seal, primarily used in a hydraulic or pneumatic cylinder. Read on to learn more about the benefits of Freudenberg's rod seals.
- October 20, 2016
FEP-/PFA-encapsulated O-rings combine the excellent chemical resistance of PTFE with the elastic behavior of an elastomer.
They are a top choice when the rubber-elastic quality of the seal is indispensable, but the application also requires better chemical resistance than traditional elastomers. The Gallagher Engineering Department can determine if an FEP-/PFA-encapsulated O-ring is right for your specific application.
In this blog post, our partners at Freudenberg Sealing Technologies outline some of the advantages of encapsulated O-rings.
- July 26, 2016
The trend of miniaturization has been growing for many years. Not only electronic, but also mechanical components are becoming more light-weight and smaller. The dependable sealing of micro systems poses major challenges in both the design and manufacture of the sealing components.
Freudenberg Sealing Technologies has recognized the positive trend of the future towards miniaturization and has risen to the challenges of this technology. The micro simmerring offers reliable sealing for shaft seals smaller than 3mm.
Freudenberg micro simmerring provides an optimal solution for sophisticated, customer-specific miniature applications such as micro pumps, micro drives and micro actuators. The micro simmerring has also proven its worth in a wide variety of micro systems in medical technology, in laboratory and diagnostic applications and in the general industry.