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Stabilant 22 Contact Enhancer Application Notes

App. Note 22 - Very High Humidity

Are Stabilants being used in high-humidity conditions?

Yes, the Stabilants have been used extensively in high humidity conditions with excellent performance. These applications range from Oceanographic and Sonar equipment, to their use on airborne connectors under tropical and/or engine-mounted equipment conditions. In addition, Stabilants are used extensively in computer an communications applications in tropical countries. All of these were done without special pre-treatment.

What are the high-humidity conditions where special precautions must be taken?

Whenever the Stabilants are used on connectors used in high-impedance circuit (typically circuits of 2 Megohms or higher), in an environment where the humidity was in excess of 98% relative humidity and/or in an environment where there was the possibility, because of thermal cycling under humid conditions, such that there could be moisture condensation on the surface of a circuit board.

What precautions have to be taken before using Stabilant 22 in these conditions?

This note applies to those applications where it is important to maintain high surface resistance (>'l Meg ohms/square), such as high impedance circuitry, or where there are very tight specifications on circuit board operations under conditions of high humidity.

When using Stabilant 22, Stabilant 22A or Stabilant 22E in very-high humidity conditions on applications such as card-edge connectors involving high-impedance circuitry, some precautions should be used to ensure that the material can work to best advantage Because Stabilants have a surface-active property (necessary to remove and hold corrosion by-products in suspension) they could also hold enough moisture such that under very high humidity conditions surface resistance's could drop to a resistance value as low as 2 x 1 0 ohms/square.

If this is unacceptable, pre-treatment of the circuit-board surface should be done in order to provide a hydrophobic (water repellent) surface between the contact and/or traces. This can be done by using one of the common fluorocarbon-oil base sprays (such as Scotchguard(TM)- 3M Corp.) to spray the critical area. Then buff of the material from the card-edge connector contacts and apply the Stabilant as usual.

The Stabilant will now be confined to the actual contact area, and the board surface will be sufficiently hydrophobic so as to maintain the required insulation resistance.

It is recommend that the Stabilants be applied only to the male portion ofthe connector.

An alternative treatment would be to apply the Stabilant material only to the actual metal contact, using only enough to coat the major portion of each contact.

Field considerations necessitating this treatment.

Normally, the impedance of most circuitry encountered in TTL or even Cmos circuits is such that this specialized treatment will not be necessary. However, where electrometer or photo-multiplier or similar circuitry is encountered, or where very low leakage is a requirement (such as on Teflon insulated stay-alive batteries for computer memories) the extra time required to apply the hydrophobic fluorocarbon can substantially reduce any leakage under high humidity conditions.

Revision 2


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 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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