GENERAL REQUIREMENTS
Reliable staking and conformal coating results from proper design, control of equipment, materials, work environments and careful workmanship by trained and certified personnel.
The staking and conformal coating materials shall have dielectric prperties that will meet the minimum circuit requirments in all antcipated environments. The amterials shall be compatible, noncorrosive and curable under conditions that will not change or adversely affect the performance or reliability of the parts on the PWA.
PREFERRED
ADHESIVE BONDING/STAKING
Adhesive bonding/staking material has been applied to the parts and locations specified by the approved engineering specification. Material quantity is sufficient to provide required support, but does not negate stress relief or mechanically compromise hardware reliability.
PREFERRED
CONFORMAL COATING
Coating covers all areas as specified on the engineering documentation. coating exhibits uniform color, thickness, proper adhesion, is smooth and tack free. No bubbles, entrapped contaminants or particles, excessive fillets, runs, drips, etc.
PREFERRED
GLASS-BODIED PARTS
Glass encased parts (i.e. diodes, etc.) shall be covered with transparent, resilient sleeving or other approved material, prior to staking or conformal coating with a rigid material.
NASA-STD-8739.1 [9.2.3.c], [11.6.3.e]
NASA-STD-8739.3 [8.1.4]
PREFERRED
3.5 GM PER LEAD/7 GM TOTAL RULE
Components weighing 7 grams (0.25 oz.) total, or 3.5 grams (0.12 oz.) per lead, shall be bonded to the mounting surface, in at least four evenly spaced places around component, when no other mechanical support is used.
Best Workmanship Practice
