ASTM F459 covers tests to determine the pull strength of a series of wire bonds. ASTM F459 can be used for wire bonds made with wire having a diameter of from 0.0007 to 0.003 in. The methods in ASTM F459 can assist in maintaining control of the process of making wire bonds. They can be used to distinguish between weak, nonadherent wire bonds and acceptably strong wire bonds. The methods are destructive.
ASTM F459 requires an apparatus for measuring wirebond pull strength with Lifting-and-Gaging Mechanism to apply a measured vertical force to the hook. The mechanism shall incorporate a means for recording the maximum force applied and shall be capable of applying force at a rate constant to within 2 gf/s (20 mN/s) in the range from 1 to 30 gf/s (10 to 290 mN/s).
ASTM F459 requires a pulling hook made from rigid wire such as tungsten. The diameter of that part of the hook that contacts the wire loop is 2.5 times the diameter of the wire used to make the wire bond. The hook has a smooth polished surface with no sharp edges in any part of the hook that contacts the wire loop.
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