Allocating Commercial Exposure for Micro BGA Rework and Line Standby Charges
Allocate micro BGA line standby and rework exposure by binding hourly downtime tariffs and hot-gas rework liability directly to SPI, AXI, and feeder logs.
Underfill Removal
Encapsulant Stripping
Specialized rework processes eliminate cured polymer encapsulants from beneath component packages to enable circuit board repair and replacement. Performing underfill removal allows technicians to salvage expensive printed circuit board assemblies when an underfilled ball grid array component fails functional testing. Encapsulation polymers like epoxy resin provide environmental protection and mechanical support during normal operation, but their permanent cured structure presents a barrier during component rework.
Specialized tools break down and extract these hardened thermoset materials without damaging underlying copper pads or laminate layers.
Thermal Degradation
Application of localized heat softens cured thermoset underfill materials by raising board temperature above the resin glass transition temperature. Executing underfill removal requires heating target board locations to approximately two hundred degrees Celsius, turning hard epoxy into a pliable gel. Rework operators use non-metallic dental picks or plastic scrapers to gently remove softened polymer from around component boundaries without scratching protective solder mask coatings.
Chemical solvents speed up polymer breakdown, weakening cross-linked polymer bonds prior to mechanical scraping. Excessive heat exposure must be avoided to prevent laminate charring or copper pad delamination.
Site Redressing
Cleaning residual polymer scraps from target lands restores clean metallic surfaces for subsequent component attachment. Effective underfill removal prepares damaged site lands for solder dress and replacement component soldering.