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S.F. Components GmbH

Piston-, rod guide elements of PTFE

Guide bands of PTFE compound serve to locate pistons and rods, prevent metallic contact between the moving components and absorb any side loads that occur. Guide bands of this type are used in hydraulic and pneumatic cylinders.

Guide elements of PTFE compounds are characterized by their exceptional frictional behavior, stick-slip-free running and high thermal and chemical resistance.

PTFE guide elements can be supplied as ready-to-fit cut lengths for piston and rod guidance applications, but are also available in stock lengths. The profile is rectangular and beveled or rounded at the edges in order to avoid impermissible edge compression in the groove corners and to facilitate fitting in the groove.

The guide bands are generally provided with a diagonal cut; a straight 90° cut or a stepped Z cut is also possible.

The gap required for functional efficiency has already been provided in the case of the cut-to-size bands. This gap is required to avoid undesirable pressure build-up and to balance the elongation of the bands at high temperatures.
 

Benefits

  • Outstanding frictional behavior
  • No stick-slip effect, even at low velocities
  • High wear resistance
  • Good damping of mechanical vibrations
  • Embedding of foreign particles possible,good wiping effect
  • Simple groove design
  • Available in stock lengths or in cut sizes ready for installation
     

Application ranges

Velocity:reciprocating up to 15 m/s
Temperature:- 60° C to + 200° C
Stat. compressive strength:max. 25 N/mm²

Compounds

PTFE-Bronze (BR) – standard material – for applications ranging from light to medium duty; material exhibits outstanding sliding properties and very good thermal and chemical resistance.

PTFE-Carbon (C) – This standard material is specifically suited to soft/yielding mating surfaces and applications involving water hydraulics.

PTFE-Carbon/Graphite (CG) – This modified material exhibits high wear resistance when used in water hydraulics and dry-running applications.
 

Calculation

Bmin   

=  Guide ring width min. [mm]

Fr    =  max. radial load [N]
Sf  =  Safety factor
DK/S =  Diameter of piston or rod
Fd  =  Permissible dynamic load [N/mm2]
Special design: Straight 90° cut
Special design: z-cut
Standard design: Diagonal cut
 

Directives

All information and values stated concerning our product portfolio are based on the knowledge optained through a long experience of manufacturing and application.
These figures are for indicative purposes only and may vary (exceed or deceed) according to the particular circumstances. Unknown factors in the applications and practice can considerably change the conditions and reduce and change statements, which may cause the above information to be invalid.
No liability can be accepted for any mistakes or omissions, error and subject to change without prior notice.

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Technical information

Guiding elements general

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Implementation

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HGW

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PTFE

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Polyacetal / POM

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