floor life

**Floor life** is the **maximum allowable time moisture-sensitive components may remain in ambient production conditions before reflow** - it is a central operational limit derived from package moisture sensitivity classification. **What Is Floor life?** - **Definition**: Clock starts when dry pack is opened and exposure to ambient begins. - **Condition Basis**: Specified at standard temperature and relative humidity conditions. - **Reset Logic**: Expired floor life generally requires bake before parts can be reflowed. - **Tracking Need**: Accurate timer control is necessary across split lots and multiple workstations. **Why Floor life Matters** - **Failure Prevention**: Exceeding floor life increases popcorning and delamination risk. - **Line Discipline**: Defines safe handling windows for planning kitting and assembly sequencing. - **Quality Audit**: Floor-life records are key evidence in reliability and compliance reviews. - **Inventory Control**: Supports prioritization of exposed lots to minimize bake and scrap. - **Risk Exposure**: Manual tracking errors can cause hidden moisture-related escapes. **How It Is Used in Practice** - **Digital Timers**: Use MES-linked exposure tracking with lot-level visibility. - **Visual Controls**: Label open times and expiry deadlines directly on work-in-progress containers. - **Containment**: Quarantine expired lots automatically pending bake or disposition. Floor life is **a critical time-based control for moisture-sensitive package reliability** - floor life management must be automated and auditable to prevent moisture-driven assembly failures.