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Stabilant 22 Contact Enhancer Application Notes

App. Note 18 - Card Connector Cautions

What precautions have to be taken when using Stabilant 22 on card edge connectors?

When using Stabilant 22, Stabilant 22A, or Stabilant 22E, on card-edge connectors some precautions should be used to ensure that the material can work to best advantage. On equipment that has been in use for some time, and which may have had its card edge connectors cleaned previously using conventional cleaners, or by using an eraser, it is important to ensure that the female receptacle in which the card edge is inserted is cleaned out thoroughly. Because of the design of most of these connectors, they have a tendency to accumulate particulate contamination within the connector body itself, especially if used in a dusty environment, or in the field.

If any type of Stabilant is used on the card edge connector without removing this accumulation of contamination, the detergency of the Stabilant will loosen the dirt and it may accumulate, in the case of vertically mounted units, at the bottom of the connector. This is especially true of the diluted Stabilants. We have encountered some isolated cases where this has caused erratic operation o the bottom contacts in the card edge row.

We would suggest that under similar circumstances, the female connector be cleaned out using isopropyl alcohol, ethyl alcohol, or one of the numerous spray cleaners or other type of cleaner, to be sure that al particulate material is removed.

In rare instances, there may be a small residue of solder-flux which has been trapped between the connector and the circuit-board,. This is not a major problem with production equipment unless a connector has been replaced. Once again, the surfactant action of the Stabilant could soften this hardened flux and cause it to migrate further into the connector. Usually this will take place within the first week to ten days after the connector has been treated.

If erratic operation is noted on card edge connectors treated with Stabilant 22, Stabilant 22A or Stabilant 22E, we would suggest removing the card, re-cleaning both the male card edge component as well as the female receptacle, re-applying the Stabilant, and re-inserting the card once again.

If silicones have been used in the past, there is a small probability that they may have cross-linked (some metals have ions that catalyze silicone to form a "cured" silicone or a silane, such as waterglass) to form a layer of cured material a few molecules thick on the contact's surface. This may be removed from the card-edge component with vigorous cleaning but in some isolated cases replacement of the female part may be the only way to eliminate the problem. The silicone might be removed by an alternating washing in kerosene and isopropyl alcohol

The greases used in electronics are basically the same as other greases, being composed of a volatile oil mixed with a soap. Sometimes the soap is a metal, hence the term lithium-grease, or sodium-grease. Problems occur when the oil evaporates; the residue, besides being a physical contaminant, can often cause leakage between pins, especially if it is hygroscopic. Once again, it is sometimes difficult to remove in this state, but to ensure connector reliability all traces of it must be cleaned out of the female connector. This is an obvious problem with silicone-treated connectors!

Because some of the oil treatments used on connectors employ non-saturated oils, users should be aware, that under the proper conditions, these oils may cross link, leading to a scummy, almost varnished appearance to the contacts. Cross linking agents include sulfur, which is often found in cutting-oils, and in free machining metals. Elastomers (rubber) and thermoset plastic components of the connectors also contain cross-linking promoters and accelerants which can make a non-saturated oil cross-link. This would suggest that the use of rubber erasers can sometimes create a problem when used to clean card-edge connectors.

The "varnishing" problem is sometimes countered through the inclusion of cross-linking inhibiting chemicals in the non-saturated oils. These, however, are usually volatile enough so that within six-to-nine months most of their efficiency has gone.

Service personnel should never use the penetrating oils designed for loosening bolts and nuts, to treat connectors. Not only are some of the solvents that are often added to the material a hazard to many elastomers and plastics, but some of the oils themselves may be very-light non-saturated types. If the type of penetrant oil is also suggested for use when threading metal parts, it may be based on a "sour" or high sulfur crude.

Stabilants are not subject to the problem of cross-linkage.

Revision 4


Stabilants are a product of Dayton Wright research & development and are made in Canada

NSCM/Cage Code - NATO Supply Code 38948

15 mL of S22A has NATO Part # 5999-21-900-6937


The Stabilants are patented in Canada - 1987; US Patent number 4696832. World-wide patents pending. Because the patents cover contacts treated with the material, a Point-of-sale License is granted with each sale of the material.

MATERIAL SAFETY DATA SHEETS ARE AVAILABLE ON REQUEST


Stabilant, Stabilant 22, and product type variations thereof are Trade Marks of D.W. Electrochemicals Ltd.

Copyright 2003 - D.W. Electrochemicals Ltd. This note may be reproduced or copied, provided its content is not altered. The term "contact enhancer", 1983 Wright Electroacoustics.


NOTICE: This Application Note is based on customer-supplied information, and D.W. Electrochemicals is publishing it for information purposes only. In the event of a conflict between the instructions supplied by the manufacturer of the equipment on which the Stabilant material was used, and the service procedure employed by our customer, we recommend that the manufacturer be contacted to make sure that warranties will not be voided by the procedures.

While to our knowledge the information is accurate, prospective users of the material should determine the suitability of the Stabilant materials 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 any 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.

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Stabilant
Stabilant 22 Contact Enhancer

Stabilant 22 Contact Enhancer

We carry the complete line of Stabilant products. Looking for something not listed here? Please contact us.
Stabilant 22
APPLICATION NOTES
1. Electronic Equipment
2. Computer cards
3. Schadow switches
4. Mic connectors
5. RTS & Dual plug patch bays
6. Biomedical Electronics
7. Computing & Peripherals
8. Cable TV
9. Robotics
10. Environmental Impact
11. Recording studios
12. Broadcast equipment
13. Mobile Radio
14. Educational computing
15. Stereo systems
16. Aid to IC insertion
17. Navigational equipment
18. Card edge conn. problems
19. Complex process control
20. Automotive service
21. Gold plating/solder alloy
22. Very high humidity
23. High current thermal runaway
24. Car stereo systems
25. Plastic element pots.
26. Farm machinery & trucks
27. Model & hobby
28. RF case seals
29. Outdoor environments
30. Computer crashes
31. Relays & switches
32. Silicone problems
33. Tin-plated contacts
34. Solder flux & resin residue
35. Post application color tinting
36. Aircraft connectors w/ flurosilicones
37. Avoiding unsafe solvents
38. S22 R&D Design Goals
39. Stabilant use on PLCC's
40. Sensor problem solution
41. Repair of flood damage
42. Marine electrical & electronics
43. All Cameras & Video Equipment
44. SCSI removable SCA drives, caddies & connections
45. Home Theater & Computer Connectors

Some of these application notes are repetitive of material in other application notes. We realize this. But some were written as a reference to a contact problem in a particular field or application.

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 R.A.L. Audio Services, 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.
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Stabilant 22
REVIEWS
Over the years, Stabilant 22 has been highly parsed in publications that target a wide range of electronics applications including:
* Andrew Marshall's Audio Ideas Guide
* BYTE Magazine (7 articles)
* Windows Magazine
* Q.S.T. Amateur Radio
* Model Railroads (2 articles)
* Motor Magazine
Stabilant 22
TECHNICAL NOTES
1. MSDS - Stabilant 22
2. General Information
4. MSDS - Stabilant 22A
5. MSDS - Stabilant 22E
9. MSDS - Stabilant 22L
20. Military Applications
21. Elastomer Compatibility
22. Effectiveness of Stabilants
24. Connector Harmonic Distortion
39. Signal rise time

There are gaps in the sequence numbers below because some Technical Note s were written by the manufacturer for specific companies and are confidential.

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 R.A.L. Audio Services, 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 Contact Enhancer

Stabilant 22 Contact Enhancer

We carry the complete line of Stabilant products. Looking for something not listed here? Please contact us.

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