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Article: Nanotimes

Pressurex® pressure-indicating sensor film provides a convenient, accurate, repeatable, and low cost control for both bonding and coplanarity. The thin flexible sensor film reveals pressures from 2 to 43,200 PSI (0.14 to 3,000 kg/cm²). When placed between the contacting surfaces of a flip chip bonder, it instantaneously and permanently changes color directly proportional to the amount of pressure applied.

Bressurex Reveals a Pressure Profile Across the Surface of a Flip Chip Bonder
Pressurex® Reveals a Pressure Profile Across the Surface of a Flip Chip Bonder

The precise pressure magnitude and distribution is then easily determined by comparing color variation results to a coor correlation chart (conceptually similar to interpreting Litmus paper).