Tech. Note 2 - General Information
What is Stabilant 22?
Stabilant 22 is an initially non-conductive amorphous-semiconductive
block polymer that when used in thin films within contacts acts under the
effect of the electrical field and switches to a conductive state.
The electric field gradient at which this occurs is established is during
its manufacture so that the material will remain non-conductive
Thus, when applied to electromechanical contacts, Stabilant 22 provides
the connection reliability of a soldered joint without bonding the contacting
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 240º Celsius,
What is its use?
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 type of contacts, including card-edge
connectors, D-Type connectors, MIL-spec connectors, signal switches etc.
Are the Stabilants reliable?
Stabilant 22, Stabilant 22A, and Stabilant 22E are used
in electronics where equipment failure can cost lives; equipment such as
biomedical electronics in hospitals, as well as aircraft navigation and
instrument landing systems.
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
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?
In what forms is it available?
The Stabilants are packaged in 15 ml, 5O mL, lOO mL, 25O mL
and 5OO mL containers for both the Concentrate (Stabilant 22), isopropanol
diluted (Stabilant 22A) and ethanol diluted (Stabilant 22E)
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.
Is Stabilant just another contact cleaner?
No, Stabilant 22 is an electrically active material which
stays resident within a contact-pair, there enhancing conductivity
without causing electrical leakage between adjacent contacts. Thus large
quantities of the material do not have to be "hosed on" as is the case
with cleaners. While 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.
Just how much should be used?
Normally, a film thickness of about 0.5 to 1 mils of the concentrate
is more than enough. In other words, you want just enough to fill up the
minute gaps within the contacts. Where Stabilant 22A or Stabilant
22E is used, be sure to allow for the evaporation of the alcohol which
forms 4/5th's of the volume.
Is the material hazardous?
No, it has very low external toxicity although ingestion should be
avoided. No skin reactions have ever been observed, and the undiluted form
22 is of low flammability. In the United States Stabilants are not
subject to the Toxic Substance Control Act (TSCA) nor are they reportable
under SARA Title III
D. W. Electrochemicals Ltd. has NSCM - Cage Code / NATO Suppler Code
- 15 mL of S22A has NATO Part # 5999-21-900-6937
- 15 mL of S22E has NATO Part # 5999-21-909-9984
- 15 mL of S22 has NATO Part # 5999-21-909-9981
The Stabilants are patented. Canada - 1987: & U.S. Patent number 4696832.
World-wide patents have been applied for. Because the patents also cover
contacts treated with the material, a Point-of-sale License is granted
with each purchase of the material.
MATERIAL SAFETY DATA SHEETS ARE AVAILABLE ON REQUEST