Lubrication Solutions for Sunroof Systems

Table of Contents

A Lifetime of Lubrication for Smooth Operation & Noise Mitigation in Sunroof Systems

There are various application areas within a sunroof system that require lubrication from either a mechanical (drive system, control brackets, slides) or a noise mitigation (moving panels, roof system frame, body structure, weather stripping) standpoint. The movement of metal on plastic, weather stripping to glass or painted surfaces, among other ageing effects can generate noises typically described as squeaks, itches, or judders.

To meet strict industry standards of durability, warranty, safety, loss of productivity, or downtime, Krytox™ products are an ideal solution for the automotive sunroof industry.

Krytox™ performance lubricants are fully synthetic perfluoropolyether (PFPE) oils and greases that offer exceedingly long life and outstanding properties for the prevention of noise, vibration, and harshness (NVH) and superior lubrication of mechanical systems.

  • Ability to survive extreme temperatures and water washout
  • Non-damaging to plastic or elastomers
  • Non-corrosive to metals
  • Non-oxidising
  • Extended lubricant life due to low volatility and outgassing
  • Non-hazardous and non-toxic
  • Indefinite shelf life if unopened and stored in a clean, dry location
  • Both oils and greases are suitable for automated spray application

 

 

Krytox™ GPL 205 Grease

Krytox™ GPL 205 grease is a polytetrafluoroethylene (PTFE)-thickened PFPE oil that contains no additives and can be used to extend the performance of various components, including those that are exposed to harsh environmental factors such as rain, snow, dust, salt, cleaning and car care products, and common automotive fluids. Krytox™ GPL 205 has been widely used by OEMs in mechanical sunroof systems and seals to achieve long-term performance and limited maintenance. 

Krytox™ GPL 205 Grease

 

Krytox™ GPL 105 Oil

Krytox™ GPL 105 oil is a clear, colourless, fluorinated synthetic PFPE oil designed to reduce friction and wear while extending equipment life in heavy-duty applications. Krytox™ GPL 105 oil has been used by OEMs to prevent weather stripping issues on sunroofs, such as NVH (noise, vibration, and harshness) and BSR (buzz, squeak, and rattle) that can occur over a vehicle’s lifetime. In turn, GPL 105 has opened new opportunities for OEMs to improve the passenger experience.

Krytox™ GPL 105 Oil

The application of Krytox™ GPL 105 oil to weather stripping offers enhanced protection from damaging ultraviolet (UV) rays in sunlight.

Performance Testing

Microscopic images show that Krytox™ AUT U14 wets the surface of weather stripping more uniformly than other PFPE offerings, including standard GPL 105 oil. This leads to a lower static and dynamic coefficient of friction, reducing slip-stick and noise in sunroof systems.

Figure 1 shows a non-treated weather stripping surface.

Performance Testing_1

Figure 2 shows how a standard PFPE oil can pool unevenly on the surface.

Performance Testing_2

Figure 3 shows how the special formulation of Krytox™ AUT U14 provides uniform coverage of PFPE oil.

 

Zins Ziegler Analysis

When an automobile is in motion, contacting surfaces elastically deform and store energy. When this energy is released, it can produce noise in the form of audible squeaks or rattles.

Zins Ziegler is a standard automotive industry test apparatus for measuring the noise potential of different material pairings. It measures static and dynamic coefficients of friction between material pairings to calculate a risk priority number (RPN). The test method uses standard protocols to simulate driving cycles up to 100,000 kilometers. Material pairings with a high RPN are more likely to have stick-slip issues and produce noise.

The table below illustrates how the presence of environmental contamination (dust) greatly increases the RPN number between weather stripping and painted panels, thus increasing the propensity to create noise.

Coating the weather stripping with Krytox™ AUT U14 reduces the RPN number compared to untreated or a competitive PFPE coating.

 

Zins Ziegler Analysis with China Dust

 

Compatibility

Krytox™ lubricants are chemically inert and compatible with virtually all automotive construction materials, including paint finishes, seal materials, glass, leather, textiles, plastics, and metals.

 

 

Source: Krytox Performance Lubricants 

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Filling of gaps and trailing edges
Bonding of sensors and current conductors
Repair, fixing of inserts and added elementsof inserts and added elements
Casing repair and bonding
Tooling with high temperature resistance
Union of added elements: Vortex, Serrations, etc.
Bonding of Nacelle
Control Shaft & Components
Protection of Screws & Components for Export
Sealing of Assembled Parts