In many aircraft connectors, a fluorosilicone washer is used at the base of the male pins to form a barrier, which when compressed by the screwing-closed of the connector, acts to form a water-exclusion barrier between the pins thus reducing both signal leakage and increasing flashover voltages.
As most solvents cause swelling of this elastomer, a connector which is "sealed" in the barrier-swelled condition, might leak once the solvent dissipates and the elastomer shrinks. While the 6% swell caused by the 80% isopropanol diluted Stabilant 22A will go away once the solvent evaporates, many service engineers are working on tight time schedule and the potential exists for premature closure of the connector.
To avoid this situation, testing was done to determine a level of isopropanol dilution which would not cause a swelling problem. It was determined that a 7% by volume dilution was satisfactory. This can be achieved by adding 7 parts by volume of isopropanol (98% isopropyl alcohol) to 100 parts of Stabilant 22 concentrate. There is sufficient air-space in the bottles to permit this, but the bottle should be over labeled as containing 7% isopropanol.
Alternately, we can, on special order only, supply a 7% isopropanol-diluted material under the designation Stabilant 22P. The MSDS's for Stabilant 22 & 22A will cover this material.
Revision 3
Stabilants are a product of Dayton Wright research & development and are made in Canada
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.
Stabilant, Stabilant 22, and product type variations thereof are Trade Marks of D.W. Electrochemicals Ltd.
© Copyright 1987, '88. '89, '90 - 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.