Electronic Restoration >> Fire Damage Electronic Restoration Classes

Some Micro-miniature and Nano-miniature type connectors have the option of pre-terminated cross linked ETFE (TefzelTM) insulated wire pigtails. Users are advised that some ETFE insulations are known to out-gas trace amounts of corrosive fluorine over time. When this wire is used with nickel coated metal shell connectors and stored in sealed plastic or ESD bags, Fire Damage Electronic Restoration Classes trapped fluorine can attack exposed metal shells and contacts. 

The problem appears to be worse for white insulation, and consequently, color coded insulation is preferred. For connectors with insulated wire terminations, upon receiving new product or pulling product from storage, Fire Damage Electronic Restoration Classes visual inspection should be performed using a minimum of 10X magnification for corrosive by products indicated by a dull "gun metal" appearance on the nickel coated shell.

Corroded gold plated contacts have a flat black appearance. Connectors with normal shells and contacts should be Fire Damage Electronic Restoration Classes repackaged such that only the connector is protected and the wire is left unpackaged, open to room conditions. Connectors with corroded contacts should be discarded. Dull connectors (with good contacts) can be carefully cleaned and used per the following procedure:

Rinse connector in distilled water for 30 seconds. Remove connector and lightly shake off excess water. Repeat the Fire Damage Electronic Restoration Classes rinse a second time with fresh distilled water and shake. Rinse connector with isopropyl alcohol. Remove and shake. Repeat the rinse with fresh isopropyl alcohol and shake. 

Perform a bakeout of 125°C for 24 hours and full or partial vacuum is recommended prior to storage. Repackage only the connector and leave the wire unpacked, Fire Damage Electronic Restoration Classes open to room conditions. For crimp type contacts, the crimp barrel diameter may be checked on a "GO" "NO-GO" basis by inserting a proper size wire in the barrel.

 (For example,a size 22 conductor may be inserted into the crimp barrel of a size 22D contact). If the barrel will not accept the conductor, Fire Damage Electronic Restoration Classes the barrel is not correctly sized. For critical applications it may be desirable to perform this test on 100% of contacts.11/ Out-gassing Control. A bake out for out-gassing control is driven by the application, and may be required where tight contamination control must be maintained.

 A bake out may be performed by the user if necessary. A suggested bake out time and temperature is 24 hours at 125°C and full or partial vacuum. Other variations of reduced time and Fire Damage Electronic Restoration Classes increased vacuum may be used based on the material used and requires project approval. Consult NASA Reference Publication 1124 for cure times and temperatures of various materials.

11.1/ Circular connectors. The silicon rubber environmental seal and lubricant applied to key ways, Fire Damage Electronic Restoration Classes are out-gassing concerns. Additional processing for contamination control due to out-gassing is available by special request from some military QPL manufacturers. Processing may also be performed in house by replacing normal lubricant with low out-gassing lubricant followed by a bake out.

 A selection list of low out-gassing lubricants and greases is found in NASA Reference Publication 1124, Fire Damage Electronic Restoration Classes sections 8 and 13 or NASA-MSFC Handbook 527. It should be noted that removal and replacement of lubricant requires some disassembly of the connectors and is usually labor intensive. A bake out of military connectors is helpful in controlling out-gassing, but is not guaranteed to resolve all out-gassing concerns.

11.2/ MIL-DTL-83513 Micro-miniature connectors. Certain receptacles contain a thin press-on fluorosilicone rubber or silicone rubber interface. Silicone may represent an out-gassing concern. If necessary, Fire Damage Electronic Restoration Classes this seal should be removed with small tweezers and discarded. If a seal must be maintained, it maybe necessary to bake out the connector or the interface seal in order to prevent out-gassing. 

11.3/ MIL-PRF-39012 SMA RF connectors. Certain plugs contain a gasket interface seal inside the coupling nut, inside the cable mounting nut, or on the mounting flange, Fire Damage Electronic Restoration Classes which may represent an out-gassing concern. Additional processing may be required for out-gassing control.

11.4/ MIL-DTL-83513 Micro-miniature and DSCC 94031 Nano-miniature connectors. Certain plugs contain an Fire Damage Electronic Restoration Classes epoxy potting material that must be traceable to acceptable out-gassing test results.11.5/ D-Sub-miniature connectors. NASA GSFC 311 connectors have acceptable out-gassing properties and no further processing is normally required.

However, some commercial versions contain an optional rear silicone rubber sealing grommet behind the connector that provides wire support and seals the rear of the connector. The silicone rubber and bonding agent represent an out-gassing concern, Fire Damage Electronic Restoration Classes and additional processing is recommended for out-gassing control. 

Other military and commercial connectors may contain a cadmium or Fire Damage Electronic Restoration Classes zinc finish that is unacceptable for use in high temperature vacuum environments due to sublimation problems. Right angle printed wiring board connectors may have a nylon mounting bracket that may require a bake out for out-gassing control.

11.6/ MIL-DTL-55302 type Printed Wiring Board connectors. Military PWB connectors are made from molding materials with known good out-gassing stability, Fire Damage Electronic Restoration Classes and no further processing for out-gassing control is normally required. However, certain commercial connectors may be molded with thermoplastic polyamides such as Nylon TM that represent an out-gassing concern. 

Certain Nylons can contain additives that can out-gas. Nylon is alsohygroscopic and can absorb moisture, Fire Damage Electronic Restoration Classes even after a bake out The use of Nylon is not recommended.11.7/ Contacts. When application requires special processing for out-gassing control, color bands shall be omitted from the contacts or low outgassing epoxyinks shall be used. For marking requirements, consult reference specification, SCD or manufacturer's drawing/catalog information as necessary.

 For coaxial and high voltage contacts, insulator material shall meet 1% TML and 0.1% CVCM requirements when tested in accordance with ASTM-E595.12/ For PWB connectors that are delivered from the manufacturer terminated with flexible printed wiring circuits, Fire Damage Electronic Restoration Classes all flexible circuits shall be screened priorto use with PWB connectors. 

Refer to Section N, Table 2E. Performance class 3 shall apply. Screening of connectors to Tables 2A through 2N of this section prior to performance of qualification is not a requirement. However, Fire Damage Electronic Restoration Classes if connector qualification samples are taken from a screened lot, or the connector manufacturer performs this test as part of their normal production and data is available that demonstrates acceptable results, tests do not have to be repeated.

1.2/ Procedures in MIL-STD-1344 (Test Methods for Electrical Connectors) are the preferred test methods for connectors. MIL-STD-202 test methods may also be used. Alternate methods require project approval.2/ Residual magnetism testing shall be performed in accordance with the procedure in GSFC Specification S-311-P-4 paragraph 4.5.4, S-311-P-10 paragraph 4.5.5, Fire Damage Electronic Restoration Classes or an alternate test method that is acceptable to the procuring activity. 

Connectors shall be qualified to levels of residual magnetism per the following designations: B = 200 Gamma, Fire Damage Electronic Restoration Classes C = 20 Gamma.3/ For contacts with crimp joined or weld joined solid, straight or formed wire leads. Unless otherwise specified, all contacts in each connector shall be measured.

 Test shall be performed using a micro-ohmmeter and four wire measurements. Mated connector pairs are preferred. Attached current leads at extreme ends of Fire Damage Electronic Restoration Classes mated connector contacts. Attach voltage leads inside the current leads on contact closest point to dielectric insert. If necessary, needle probes may be used. Apply one milliamp DC or as otherwise specified.

 Measurement shall not exceed 15 milliohms for size 22 contacts, 25 milliohms for size 24 contacts terminated to size 25 solid wire or Fire Damage Electronic Restoration Classes solder cups, 32 milliohms for size 24 terminated to size 26 AWG wire pigtails, 70 mohms for size 30, or as otherwise specified.

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