Shanghai-region manufacturing feeds dense export logistics. Metal first faces humid plant and warehouse air. It then waits through port and terminal dwell. After gate-in it faces container temperature cycling for weeks. A global manufacturer specifies multimetal VCI film for stages one and two corrosion chemistry inside a sealed pack. Stage three humidity still needs barrier free volume and sized desiccant for bare-metal ocean legs. Treating all three stages as just put film is how bright parts leave looking protected and arrive stained.
| Stage | What happens | What solves it |
|---|---|---|
| 1. Plant and warehouse | Flash rust after wash; open poly; wet cardboard | Dry clean; multimetal VCI bags; closed free volume |
| 2. Port and hinterland dwell | Days of humid waiting after packing | Sealed life sized beyond truck hours |
| 3. Ocean container climate | Day-night cycles drive condensation | Aluminium barrier free volume + sized desiccant with VCI |
Wet metal at seal. Fix: dry first.
Humidity equalises. Fix: continuous seals.
Pack sized only for sailing days. Fix: full sealed-life arithmetic.
No barrier/desiccant. Fix: moisture stack with VCI.
Machined kits after clean dry; mixed metals for auto and machinery lots.
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Pallet cartons with stability plus vapour activity.
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Modules where ESD and humidity rules apply together.
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With VCI and desiccant for multi-week container climate.
View Full SpecsMost mixed-metal kits use multimetal VCI bags sealed after dry clean. Confirm oil-free rules, plating and ESD needs.
Often not alone for bare metal. Pair VCI with aluminium barrier free volume and sized desiccant for container climate humidity.
Common causes: wet metal at seal, open corner seals, wrong metal grade, desiccant outside free volume, or sealed life longer than the moisture design.
Add expected terminal and hinterland days into sealed duration. A pack sized only for sailing days fails when cargo waits humid days before departure.
Grade-tied MIL-PRF-22019E and NACE TM0208 documentation where applicable, SDS, ISO certificates and a packing method note.
No. BENZ is a global protective packaging manufacturer applying VCI systems to Shanghai-region export manufacturing routes.
Nested stampings often need paper or film interleave. Machined kits usually need sealed film bags.
Plant days plus warehouse days plus terminal days plus ocean weeks plus destination storage.
Share metal list, cleanliness path, warehouse and terminal dwell, voyage weeks and destination climate. The specification should name film format, seal method, compliance documents and whether barrier plus desiccant are required.
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