Santovac® 5GB Ultra High Vacuum Grease
Use on electrical and electronic contacts
Polyphenyl ethers have been used on electrical and electronic contacts for
more than 25 years. This has proven to be an excellent application of this
technology for a number of reasons:
1. PPE's have excellent long term oxidative and thermal stability
2. They also have very low vapor pressure and, therefore, depending upon
operating conditions can have a life of 20-40 years.
3. This technology has been proven in this application and is speced in to
many applications.
4. They have an extremely high surface tension which means they won't
migrate and, therefore, cannot contaminate other parts of an electrical or
electronic system.
5. PP's significantly reduce contact resistance and will increase the
number of cycles (insertions and withdrawals) into the millions as opposed
to just a few thousands of cycles for unlubricated contacts. As a result,
contact life will be significantly higher since they will not break nor show
excessive wear.
6. Since the PPE's are so stable they prevent all forms of corrosion,
including "Fretting Corrosion", or micromotion, which is a major problem
today in all types of applications such as automotive sensors, mobile
phones, telephone switching connectors, utility electrical equipment,
nuclear power plant switches, etc.
7. PPE's resist water and, therefore, prevent water from getting to the
surface of the contact. Droplets are not a problem, since the PPE coating
is self healing and there is continuing motion of the droplets which
provides resistance towards other fluids and gases.
These products can be applied either as 100% pure, or in an evaporative
solvent in order to achieve a thin film on the surface of the contact.
Also, the contacts can be dipped in the Connector Lubricant or Lubricant
Solution, or the Lubricant or Solution can be brushed or sprayed on the
connector.
The PPE's are nonconductive fluids. The metal asperities, or roughness of
the contact surface, are sufficient to maintain the contact. After the
contact is coated with the lubricant film, the connector is mated. During
the insertion process the metal asperities make contact providing excellent
electrical transfer. In addition, some of the droplets tend to move
slightly apart, until the contacts are seated. There will always be a thin
coating between and around the contacts due to the self healing property
that results form its high surface tension and non-wetting property. The
contact will be fully protected from contaminants, corrosion, wear, etc.,
but still provide excellent electrical transfer.
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Wednesday December 03, 2008
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