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EMS handbook

6. Parts & materials handling

A warehouse in an Electronics Manufacturing Services facility is a dynamic staging environment. The physical movement of sensitive electronic components must be carefully controlled to prevent damage, inventory loss, and subsequent quality issues.

This chapter outlines the standard procedures for the physical handling of factory materials. We detail the physical protocols for incoming receiving inspections, electrostatic discharge safe routing, and the precise kitting operations required to supply the SMT lines accurately.

  • 6.1 Receiving, inspection routing & identification

    Receiving acts as the gateway for the manufacturing system. Once a component passes this point, the ERP typically assumes it is "good active inventory"—available for planning, picking, and production....

  • 6.10 Line returns, scrap & nonconforming material

    The return flow of material from Production back to the Warehouse is often where inventory accuracy degrades. When unused parts, partial reels, and scrap are returned indiscriminately, it can create "...

  • 6.2 Put-away & location control

    Physical put-away translates "financial possession" into "operational availability." If a component sits on a warehouse shelf but remains unassigned in the WMS, it acts as a **Phantom Shortage**. This...

  • 6.3 Storage zones & segregation rules

    Physical inventory segregation is a key component of material control. A "rejected" digital flag in the ERP is less effective if the component reel is sitting on an open shelf next to active stock, wh...

  • 6.4 Environmental controls: temp/RH, cabinets, monitoring

    The physical warehouse environment plays an active role in maintaining material quality. Uncontrolled storage conditions can degrade materials before they reach the SMT line. Issues like moisture satu...

  • 6.5 Strict ESD control program

    Electrostatic Discharge (ESD) is a primary risk factor for high-liability electronics. It is invisible, typically inaudible, and frequently causes "latent defects"—microscopic damage that passes initi...

  • 6.6 Strict MSD handling & baking

    Moisture Sensitive Devices (MSDs) present a critical process risk. The concern is moisture accumulating microscopically within the plastic component encapsulant. During the intense heat of SMT reflow...

  • 6.7 Shelf-life, lot traceability & recall readiness

    Granular traceability provides essential risk mitigation. In the event of a supplier component recall or a field failure, detailed traceability allows you to identify and isolate only the specific aff...

  • 6.8 Solder paste, flux, chemicals storage & handling

    Solder paste and adhesives are chemically active mixtures. Proper storage retards the natural aging process—such as flux reacting with alloy or polymers beginning to cross-link. Poor storage can resul...

  • 6.9 Picking, kitting & line release discipline

    Kitting transforms generic inventory into committed "Work in Progress" (WIP). It represents the digital assignment of specific material lots to a specific demand (Work Order). Accurate kitting is fund...