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Materials

The demands on reliability are continuously increasing. At the same time, the service conditions are getting tougher to match the development towards higher effectiveness of the hydraulic systems. Therefore, it is very important to be familiar with the operating conditions and parameters, such as operating temperature and pressure, load, speed, and fluid when choosing the most appropriate guide material. The most common materials for guides listed in this section are:
Polyamide

Glass fibre reinforced polyamide guides are suitable for medium and heavy duty applications and are characterized by the following properties:

  • wide temperature range
  • wear resistant
  • reduce vibrations
  • protect seals from particles
  • protect components from diesel effect
  • easy to install
  • tight tolerances
  • withstand heavy side loads
  • withstand high cycling speed
  • prone to moisture swell before installation

P-2551 is the standard polyamide material for guide rings. Technical specifications are provided in table 1.

For additional information, refer to Materials.

Fabric reinforced composites

Fabric reinforced composites consist of cotton fabric bound with thermoset phenolic resin. Its structure and the ability of the fabric fibres to absorb a certain amount of oil make these phenolic guides almost self-lubricating. However, cotton reinforced phenolic guide rings should not be used at high stroke speeds over 0,5 m/s (1.6 ft/s). They are suitable for medium and heavy duty applications and are characterized by the following properties:

  • wide temperature range
  • wear resistant
  • reduce vibrations
  • protect seals from particles
  • protect components from diesel effect
  • low thermal expansion
  • easy to install
  • tight tolerances
  • withstand heavy side loads

Phenolic resin with cotton fabric laminate (PF) is the standard fabric reinforced composite. Technical specifications are provided in Technical specifications are provided in table 1. SKF also supplies a variety of other thermoset resins and fabrics on request.

For additional information, refer to Materials.

PTFE

PTFE is typically used in guides where low friction and resistanceto chemicals, heat or wear are essential. However, PTFE should only be used in applications with low surface pressure. To obtain optimal wear resistance, PTFE materials are available with different fillers, such as bronze or carbon powder. PTFE guides are characterized by the following properties:

  • chemical resistance
  • wide temperature range
  • low friction
  • anti-adhesive, low breakaway friction
  • good wear resistance
  • reduce vibrations
  • protect seals from particles
  • protect components from diesel effect
  • tight tolerance machined guide rings available

292 is the standard PTFE material for guides and strips. Technical specifications are provided in table 1. SKF also can supply many other PTFE material compounds on request.

For additional information, refer to Materials.

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