The Detroit auto supply chain moves stampings, machined powertrain parts, fasteners, brackets and sub-assemblies through humid summers, cold winters and long kanban stores. Assembly plants often want oil-free clean metal. Cold steel brought into warm buildings sweats. Mixed-metal kits corrode differently than pure ferrous lots. A global manufacturer specifies multimetal VCI film when metal is dry, grade matches the metal list and free volume is sealed. It does not fix dirty wet parts or open bags on a dock.
| Failure | Root cause | Fix |
|---|---|---|
| Flash rust after wash | Open dwell in humid summer stores | Multimetal bag sealed same shift |
| Goods-in oil reject | Heavy RP oil on clean-pack programmes | VCI clean path when process allows |
| Stains in mixed kits | Steel-only grade on multimetal bags | True multimetal grade |
| Stains after winter move | Condensation sealed with free water | Warm and dry before seal |
| Ocean arrival rust | Film only, no moisture design | Barrier free volume + desiccant |
Cold metal moved from outdoor docks or cold trailers into heated plants forms surface condensation. If that free water is sealed into a bag, VCI cannot rewrite physics. Equalise and dry surfaces, then seal. Summer humidity is the opposite season of the same lesson: high RH air on open bright metal still drives flash rust between wash and bag.
Oil fails goods-in. Fix: sealed multimetal VCI after dry clean.
Free water sealed in. Fix: dry fully after cold moves.
Wrong grade. Fix: multimetal grade from metal list.
Film only. Fix: barrier free volume + desiccant.
Machined powertrain and precision steel clean packs.
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Pallet cartons of components with load stability plus vapour activity.
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Electronic modules with metal when ESD rules apply.
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With VCI and desiccant for multi-week export sealed life.
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Most mixed-metal component kits use multimetal VCI bags sealed after a dry clean. Confirm plating, aluminium content and any ESD needs.
Cold metal sweats in warm air. Free water sealed into a bag starts corrosion immediately. Dry fully, then seal VCI film.
On oil-free programmes, yes when designed as a sealed VCI system. On oil-required programmes, oil and VCI must be compatible by design.
Nested faces often need paper or film interleave. Sealed kits and machined parts usually need film bags.
When sealed life includes multi-week ocean humidity or long high-RH storage beyond a simple bag design.
Grade-tied MIL-PRF-22019E and NACE TM0208 documentation where applicable, SDS, ISO certificates and a method note.
No. BENZ is a global protective packaging manufacturer applying VCI systems to Detroit-region auto and engineering metal routes.
Case and kit IDs must match the packing list so goods-in can reconcile without opening every bag.
Share metal list, oil-free rules, store days, winter handling constraints and whether lots export. The reply should name film format, seal method, compliance documents and any barrier or desiccant needs.
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