Stabilant 22
What is Stabilant 22? Stabilant 22 is an electrically active material
which stays resident within a contact-pair, there enhancing conductivity
without causing electrical leakage between adjacent contacts. Although
Stabilant 22 does have a detergent action it is not sold as a cleaner,
just as it has a good lubricant action but is not sold as a lubricant.
Stabilant 22 is used to increase the reliability of contacts. Tenfold to
one hundred-fold increases are not unusual. At the present time it is
used in many different types of contacts, including card-edge
connectors, D-type connectors, MIL-spec connectors, signal switches,
etc.Stabilant 22 is an initially non-conductive amorphous-semiconductive
polyoxyethylene-polyoxypropyline block polymer with a molecular weight
of about 2800 that, when used in thin films between contacts, acts under
the influence of the electrical field and switches to a conductive
state. The electric field gradient at which this occurs is established
during manufacture so that the material will remain normally
non-conductive. Its switching speed is too slow to allow it to be used
in the more traditional semiconductor applications; however, this means
that signals at frequencies substantially above five cycles per hour
will not be modulated by the switching characteristics of Stabilant
22.Thus, when applied to electromechanical contacts, Stabilant 22
provides the wide-bandpass connection reliability of a soldered joint
without bonding the contacting surfaces together! In its undiluted form
at room temperature, Stabilant 22 has the viscosity of medium-weight
motor oil, although it thins out with increasing temperature, starting
to decompose into the two polymers it is formed from at about 240°
Celsius. It has a very low vapor pressure and therefore there is no
appreciable loss of material from evaporation. It has been in some
applications for more than fifteen years without renewal, and it is
probably safe to say that in the majority of cases
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