The quality of packaging specifications for custom hardware structural parts directly determines whether the goods arrive in “pristine condition” or “riddled with rust” after an overseas voyage. Industry experience has repeatedly proven that 90% of rust and impact damage occurring during ocean transport can be prevented through proper packaging specifications.
A comprehensive set of packaging requirements for hardware parts should cover three key areas: rust prevention, structural protection, and labeling.
This article outlines the standard format for writing these requirements.
I.
Rust Prevention Requirements: The Core of Packaging Specifications
- Rust-prevention materials: Wrap bare metal parts in VCI (Volatile Corrosion Inhibitor) paper or place them in VCI bags, ensuring direct contact or close proximity to the metal surface; for mixed-metal assemblies, select a VCI grade capable of protecting steel, aluminum, copper, and plated parts simultaneously;
- Desiccants: Place silica gel desiccants inside sealed packaging; for ocean voyages exceeding 20 days, allocate 2–3 units per cubic foot, calculating the quantity based on container volume, voyage duration, and route humidity rather than simply adding a handful at random;
- Sealing and oil coating: Heat-seal parts in PE barrier bags to block moisture; for products requiring oil coating, select rust-preventive oil in accordance with the SH/T 0692 standard, ensuring a water content of no more than 0.03%;
- Surface protection: Apply PVC protective film to decorative surfaces—such as polished, mirror, or brushed finishes—to prevent scratches and fingerprint contamination.
II. Structural Protection: Compliance in Export Packaging is a Mandatory Requirement
Export wooden packaging must comply with the ISPM-15 international standard: solid wood exceeding 6 mm in thickness requires heat treatment (core temperature of 56°C for at least 30 minutes) or fumigation, and must bear the IPPC mark; non-compliant wooden crates or pallets risk detention or rejection at the port of destination.
Wooden crates for ocean freight are designed in accordance with GB/T 19142 “General Rules for Packaging of Export Commodities,” featuring HDPE moisture-proof liners; heavy items require foam cushioning and timber bracing, while securing within the container is achieved via steel or PP strapping, with heavy cargo loaded first to ensure even weight distribution.
While domestic transport packaging can be simplified to cartons with cushioning, moisture protection and structural reinforcement are indispensable for long-haul ocean shipping.
III.
Labeling Requirements: Ensuring Traceability for Every Crate
Packaging labels serve as the entry point for acceptance and traceability. They must include shipping marks (product name, specifications, case number, net/gross weight, contract number, consignee, and place of origin), handling symbols (moisture-proof, rain-proof, fragile, “this side up”), and production date linked to heat/batch numbers; export shipments also require additional labeling as mandated by the destination.
According to packaging standards from steel enterprises like Baosteel, markings should include the trademark, supplier name, product name, standard, specifications, bundle number, customer contract number, heat number, weighing method, net/gross weight, consignee, and handling symbols. The more comprehensive the information, the more efficient the arrival inventory check and quality traceability process will be.
IV. Drafting Packaging Specifications: Five Essential Elements
- Packaging Grade: Classified based on storage and transport conditions (domestic short-haul, export sea freight, or long-term storage); the grade determines the level of investment in rust prevention and structural reinforcement.
- Bill of Materials: Specify quantities of VCI paper/bags and desiccant, as well as the use of PE barrier bags, foam, wooden crate types, and IPPC treatment methods.
- Packing Method: Quantity per case, individual item wrapping/packaging, interlayer separation materials, and localized protection for vulnerable areas.
- Pallets and Load: Pallet specifications, maximum stacking height, weight per pallet, and container loading requirements.
- Inspection Requirements: Pre-shipment spot checks (opening cases), drop/stacking tests (if required), and inclusion of packaging inspection records with the shipment.
V. Trends: Rust-Proof Packaging Moving Toward Standardization and Digitization
The automotive industry has introduced rust-proof packaging protocols for stamped parts, categorizing them into three rust-prevention grades based on actual storage and transport conditions, each corresponding to specific packaging methods.
For industrial equipment exports, a multi-layer protection system is commonly adopted: ISPM-15 compliant wooden crates, VCI stretch wrap, aluminum foil barrier vacuum sealing, container desiccants, and steel strapping. Industry experts recommend incorporating packaging requirements into the technical agreement during the contract phase—clearly listing rust-prevention grades, material standards, and inspection methods.
By effectively guarding against moisture throughout the 20-to-35-day sea voyage, the incidence of customer complaints and claims can be reduced by more than half.
