Thus, when applied to electromechanical
contacts, Stabilant 22 provides the connection reliability of a soldered
joint without bonding the contacting surfaces together!
Its switching speed is too slow to allow it to be used in the more traditional semiconductor applications, however this means that signals of frequencies substantially above five cycles per hour will not be modulated by the switching characteristics of Stabilant 22.
Chemically, Stabilant 22 is a polyoxyethylene-polyoxypropyline block polymer with a molecular weight of about 2800. 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, the equipment on which it is used will be retired for obsolescence before the Stabilant must be renewed.
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 about 240 o Celsius,
In one test we performed in public at trade shows, we ran a computer mother-board immersed in a clear plexiglas case, partially filled with Stabilant 22. This demonstration was quite effective in dispelling doubts about the efficiency of the material in NOT shorting out between adjacent contacts.
Because of Stabilant's exceptionally long shelf life, and their proven effectiveness in the prevention of system malfunctions, many more manufacturers are now specifying the use of the material in preventive maintenance programs. They are being used to solve, as well as prevent problems in such diverse fields as pulp-and-paper mills, oil-fields, mining, railway operations, diving, marine-electronics, and air-traffic-control.
Does all of this help to answer your questions?
Because of the 4:1 dilution of the Stabilant 22A and Stabilant 22E, they will generally cost about 1/4 the amount of the concentrate, although, obviously, it is the concentrate that that remains after the alcohol evaporates which accomplishes the job. The alcohol is just there as a solvent to "carry" the concentrate into place. These versions can be applied to socketed IC's without removing them from the sockets. The concentrate on the other hand is often used as an insertion aid when inserting multiple pin IC's because of its lubricating properties.
In addition, Stabilant 22A is available through distributors in a 5 mL size. Many other customers pack Stabilant 22A with their own products where it is used on such items as the card-edge connectors.
Just how much should be used?
D. W. Electrochemicals Ltd. has NSCM - Cage Code / NATO Suppler Code 38948
NOTICE: This data has been supplied for information purposes only. While to our knowledge it is accurate, users should determine the suitability of the material for their application by running their own tests. Neither D.W. Electrochemicals Ltd., their distributors, or their dealers assume any responsibility or liability for damages to equipment and/or consequent damages, howsoever caused, based on the use of this information.
Stabilant, Stabilant 22, and product type variations thereof are Trade Marks of D.W. Electrochemicals Ltd.
© Copyright 1988, '89, '90, '91, '96, '97 - D.W. Electrochemicals Ltd.
The term "contact enhancer" © 1983 Wright Electroacoustics.
Reproduction of this material is authorized for use only in its present form without alteration as to content.
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