Characteristic properties for sealing material use in dynamic seals

        The following characteristic properties of carbon and graphite material have opened up wide fields of application for carbon and graphite sealing rings, e.g.:

·        Wear resistance

·        High fatigue resistance

·        Chemical resistance

·        Temperature resistance

·        Good thermal conductivity

·        Outstanding resistance to temperature cycling

·        Excellent dimensional stability

·        Favorable relationship strength / apparent density

·        In high and low temperature technology

·        For the rotary and  reciprocating equipments.

·        In pumps, compressors and turbines

·        In aircraft and automobile construction

·        In shipbuilding

·        In the paper processing

·        In air conditioning techno- logy

·        In household appliances

·        In reactor technology

·        Sliding and dry running capacity, low coefficient of friction

·        No welding risk, contrary to metals when used as mat- ing materials

·        In chemical and petrochemical industries.

Supplementary TISTAM leaflets on carbon and graphite for mechanical applications:

Chemical resistance , Characteristic values, standard grades , 007A General information; properties, application as sliding material, design recommendations. 

Segments ring for piston rod.

Material Carbon graphite.

Sealing rings for mechanical seals

About 50 years ago, usage of a mechanical seal as a construction element was restricts- ed to only a few fields of application. Nowadays the mechanical seal can be regarded as the main high–quality sealing element in use for the sealing of rotary shafts

Carbon seals for steam head seals (Steam header seals)

The steam header seal, or in more general terms the feeder head seal, represents a special from of Mechanical seal.

Sealing rings for radial seals

Because of their characteristic properties car-carbon/graphite sealing rings have been successfully used for many years in radial seals, both with rotary and oscillatory motions. Apart from carbon sealing rings encased in material, multi-part carbon sealing rings com-posed of segments are mainly used for radial seals.


Gap seals


Typical fields of application for gap seals are steam tur-bines, piston rod glands of oil-free piston compressors, screw compressors in general Gap seals are used with both rotating and reciprocating motions. A gap seal is always preferable to a contact seal, if excessive wear is to be expected with a contact seal because of the operating conditions. This mainly applies for high sliding speeds and high loads where, in the case of a contact seal, excessive heating can occur at the sealing faces, resulting in excessive wear. Both one piece carbon rings, encased in metal holders, and segmented sealing rings are used in goop seals. 

Multi Segment Ring Metal clad carbon rings Labyrinth rings

The multi-part construction is necessary, because carbon and graphite material cannot deform elastically like other  sealing material for radial seals. In addition, the multi-part construction simplifies assembly. It can produce multi-part carbon sealing rings with the necessary accuracy up to a diameter of about 200 mm.  Depending on the size of the rings, they are divided into 3, 4, 6, 8, 12 or more segments. In order to secure an optimal assembly and thus a maxi-mum sealing effect the indivi-dual ring segments are num-bered.


Contact seals

Provision must be made in the design of the seal for adjustment of the rings as there will be wear taking place due to the continuous contact to the shaft or piston to be sealed. This is made possible by using overlapped or over-lapped mortise joints having a sufficiently large play at the inter segment face


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