FTL supplies Elringklinger PTFE seals
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FTL Seals Technology product story
Edited by the Engineeringtalk editorial team
Jul 8, 2009
Elringklinger's PTFE seals are manufactured with outside diameters of up to 2,880mm from a choice of more than 600 PTFE compounds.
Due to its manufacturing process and subsequent processing, PTFE is ideal for the production of small quantities in different dimensions and with individual designs.
The raw material is supplied in the form of powder, which is compacted in rods, rings or slabs.
These 'blanks' are then sintered in large ovens.
The temperature/time sintering process is adapted to the material and the dimensions of the components and can last for several days.
After the cooling down and stress relieving of the sintered blank it can be milled, for which specific machines are required.
The geometry of the seal depends on the requirements.
Shapes ranging from a simple PTFE O ring to a spring-energised U/V ring are possible.
PTFE has a thermal expansion coefficient of 10 to 16 x 10-5 K-1.
This must be taken into consideration for the processing of PTFE components as well as for application purposes.
If the application involves large ranges in temperature, the design of the seal has to take into consideration the material itself as well as the application.
The PTFE component can, for instance, be provided with a step that forms a positive connection with the corresponding machine part.
The production of filigree type geometry is carried out with a high degree of precision.
As an example, an application in a double-motion agitator required a vacuum seal.
A spring-energised U ring manufactured from a PTFE compound was selected.
Its geometry provides a flange that is clamped and prevents the seal from turning.
The machine has a diameter of 1,150mm and rotates at a speed of up to 2.5m per second and can have a life of up to 2,000 hours.
In order to ensure steady stress conditions at fluctuating temperatures during transport and storage, the seal is supplied to the user mounted on a sleeve.
PTFE parts in the XL format are not only required as seals.
There are requirements that make it necessary to have constructional parts produced from PTFE.
The excellent anti-seizing properties are often the reason for such a choice.
In addition, PTFE offers a high degree of thermal stability and very good chemical resistance.
Bellows for the chemical engineering industry are a typical example of products that require these properties.
PTFE bellows are often used to connect up two parts of a plant.
Temperatures of up to 200C may be reached.
The component must be resistant to chemicals and the media must not adhere to its surface.
The production of such bellows is particularly difficult since the part deforms during manufacture by its own weight.
PTFE structural elements of irregular or rectangular form can be obtained from Elringklinger.
The company also manufactures pump housings that incorporate all design details specified by the client.
An in-depth consultation can offer further benefits.
Due to the anti-seizing properties of PTFE, spacers for heat exchangers offer longer maintenance intervals.
PTFE slide rails achieve sliding action with little friction.
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Contact FTL Seals Technology
Tel +44 113 252 1061
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