The core packaging requirements for international air freight are “Safety Protection, Compliance Adaptability, and Ease of Transport”. These requirements must protect cargo from damage during loading and unloading, turbulence, and pressure fluctuations, while also complying with the packaging standards of airlines and destination country customs to avoid detentions, delays, or transportation accidents due to packaging issues.
In this article, Weefreight will explain the packaging specifications and general precautions for different cargo types, hoping to be helpful.
- Specific Packaging Requirements for Core Cargo Types
The physical properties (e.g., fragile, electrically charged, liquid) and safety risks (e.g., hazardous materials, living organisms) of different cargo types vary significantly, requiring tailored packaging solutions:
- Fragile/Precision Cargo (Glass, Instruments, Electronic Components)
These types of cargo are sensitive to shock, vibration, and pressure fluctuations. The core packaging principle is “cushioning and securing” to prevent displacement or collision during transport.
Inner Packaging:
Individual products must be completely wrapped with cushioning material, such as bubble wrap (at least three layers), pearl cotton, or foam blocks, to ensure there are no gaps between the product and the outer packaging.
Precision instruments (such as sensors and chips) must be wrapped in anti-static bags or anti-static foam to prevent static damage to the components.
Glass products (such as optical lenses) must be additionally enclosed in corrugated cardboard dividers or custom foam cardboard slots to ensure “individual and independent securement.”
Outer Packaging:
Use high-strength corrugated cardboard boxes with five or more layers (bursting strength ≥ 1800kPa) or wooden packaging boxes (must meet IPPC fumigation standards and be stamped with a “fumigation stamp” to avoid quarantine detention in the destination country).
Fill any gaps in the box with filler (such as bubble wrap or shredded paper) to ensure there is no swaying noise when the box is shaken.
If the weight of the goods exceeds 10kg, wrap the box with packing tape (plastic or paper) or apply “reinforced sealing tape” to prevent cracking.
Example: For transporting high-end mobile phone chips, they must first be placed in an anti-static bag, then placed in a custom foam card slot, then wrapped with three layers of bubble wrap, then packed in a five-layer corrugated box, then filled with bubble wrap, then wrapped with packing tape.
- Electrically Conductive Goods (lithium batteries, power banks, and other electrically conductive devices)
Electrical cargo is restricted aviation cargo (some dangerous goods), and packaging must comply with the International Air Transport Dangerous Goods Regulations (IATA DGR), with the core emphasis on “insulation to prevent short circuits and leaks.”
Basic Requirements:
UN-certified dangerous goods packaging (such as UN cartons or UN plastic drums) must be used, and the packaging must be printed with a “lithium battery mark” (e.g., Class 9 dangerous goods label or “Cargo aircraft only” label. For passenger aircraft, please confirm airline restrictions).
Lithium batteries must be packaged separately and must not be mixed with metal objects (such as keys or coins) to prevent short circuits between the positive and negative poles.
Battery cells/battery packs must be separated by insulating material (e.g., insulating sheets, individual paper boxes). The number of lithium batteries in each package must not exceed airline regulations (generally, passenger aircraft allow ≤ 2 cells/1 battery per ticket; this limit may be relaxed for cargo aircraft).
Special Scenarios:
Battery-carrying devices (such as laptops and drones): Ensure the device is powered off. If the battery is non-removable, wrap the device in bubble wrap to prevent accidental key presses. Removable batteries must be packaged separately according to lithium battery standards, either in a separate box or within the same box as the device.
High-power lithium batteries (such as electric vehicle batteries): Fireproof packaging materials (such as fireproof foam or flame-retardant cloth bags) are required. The outer packaging must be labeled with “battery type, capacity, and voltage,” and an MSDS (Material Safety Data Sheet) must be provided.
- Liquid/Paste-like Goods (Cosmetics, Reagents, Food Sauces)
Liquid goods are susceptible to leakage due to pressure fluctuations (low pressure at high altitudes), so the core packaging principle is “sealing and leak prevention + corrosion resistance.”
Inner Packaging:
Single containers must be double-sealed with a sealing cap and film (e.g., after tightening a cosmetics bottle, wrap the bottle mouth with two layers of raw tape or aluminum foil).
Glass bottles (such as essential oils and reagents) must be covered with foam or bubble wrap, with the bottle mouth facing upward to prevent leakage when inverted.
Paste-like/semi-fluid goods (such as creams and sauces) require a squeeze tube and sealing cap. The end of the tube must be folded and secured with tape to prevent the contents from squeezing out.
Outer Packaging:
Use leak-proof containers (such as sealed plastic boxes or wax-coated waterproof cartons) and line the interior with a waterproof film (such as PE film) to prevent contamination of other goods even if the inner packaging leaks.
Multiple liquid products should be separated by corrugated cardboard partitions to prevent collisions and container breakage.
Outer packaging should be marked with an “upward” (↑) arrow to remind loaders and unloaders to maintain proper orientation.
- Dangerous Goods (Chemicals, Flammables, Compressed Gases)
Packaging of dangerous goods must strictly comply with IATA Directives for Transport (DGR) regulations and the dangerous goods regulations of the destination country. Dangerous goods that are not properly packaged are strictly prohibited from air transport; otherwise, you may face significant fines or legal liability.
General Requirements:
UN-certified packaging corresponding to the dangerous goods category must be used (e.g., UN 1A2 cartons for flammable liquids, seamless steel cylinders for compressed gases). The packaging must clearly display the dangerous goods category label (e.g., a red “Flammable Liquids” label), the UN number (e.g., UN 1203 Ethanol), and the shipper/consignee information.
The packaging must withstand a 1.2-meter drop test and a stacking test to ensure it will not break or leak during transportation.
A Dangerous Goods Declaration Form (DGD) and MSDS must be included with the shipment, clearly identifying the cargo’s composition, hazardous properties, and emergency response procedures.
Typical Examples:
Flammable liquids (such as alcohol): Use UN-certified plastic barrels (thickness ≥ 2mm), leaving 5%-10% expansion space inside the barrel (to prevent thermal expansion and contraction). Use screw caps and gaskets on the barrel mouth, wrap them in UN cardboard boxes, and fill the boxes with flame-retardant foam.
Compressed gases (such as oxygen cylinders): Secure them with shock-proof cylinder brackets, wrap them with bubble wrap, and pack them in wooden boxes. Label the box “Compressed Gas” and “Do Not Impact” with a warning.
- Fresh/Perishable Goods (Fruits, Seafood, Flowers)
Fresh goods require packaging that controls temperature, humidity, and oxygen concentration to extend their shelf life. The key is “insulation + ventilation” (some require cold chain packaging).
For regular fresh produce (such as fruits and vegetables):
Use breathable fresh-keeping bags (with micro-perforations to prevent condensation and spoilage) for inner packaging. Individual fruits (such as apples and pears) should be wrapped in netting to prevent damage.
Use corrugated cardboard boxes (with 3-5 1cm diameter ventilation holes on the sides) for outer packaging. Line the box with absorbent paper (such as kraft paper) to absorb condensation.
For transportation in hot areas, place “ice packs” (non-liquid ice to prevent leakage) in the box. The ice packs should be sealed and separated from the cargo with a partition.
Low-temperature fresh produce (such as seafood and meat):
Professional cold chain packaging is required: Use a food-grade aluminum foil insulated bag as the inner layer, place dry ice (the amount is calculated based on the shipping time, typically 500g of dry ice per 24 hours) or gel ice packs in the middle, wrap the bag in an EPS insulated box (thickness ≥ 5cm), and top with a corrugated cardboard box.
Please note that for dry ice packaging: Leave one or two ventilation holes in the insulated box to prevent the expansion of CO₂ produced by the sublimation of dry ice, which could cause the box to burst. Mark the outer packaging with warnings: “Contains dry ice” and “Do not consume.” Also declare the dry ice weight (airlines have a maximum weight limit for dry ice per ticket, typically ≤ 200kg).
Flowers:
Cut the base of the flower stems at a 45-degree angle and insert a “fresh-keeping tube” (filled with fresh-keeping solution). Wrap the flower heads with plastic wrap to prevent dehydration.
Use a cardboard box (with ventilation holes) to secure the bouquet to prevent the branches from breaking. Place a damp tissue inside the box to maintain humidity, and cover the box with a waterproof bag (to protect against rain and snow).
II. General Packaging Precautions (Applicable to All Goods)
Prioritize compliance to avoid “hidden violations.”
Packaging materials must meet the environmental and quarantine requirements of the destination country. For example, the EU prohibits the use of unfumigated wooden packaging (which requires the IPPC mark), and the US prohibits the use of polystyrene foam packaging.
Used packaging that is damaged, contaminated, or illegible is prohibited, especially for hazardous goods and food. Old packaging may contain harmful substances or fail to meet hygiene standards.
Packaging labeling must be clear and complete: include recipient/sender information (in Chinese and English), product name, weight, and warning labels such as “fragile/upward” to prevent misdirection or handling errors due to unclear labeling. Appropriate weight and size to avoid overpacking or underpacking.
Outer packaging dimensions must comply with the airline’s “single-piece cargo restrictions”: typically, passenger aircraft single-piece weight ≤ 80kg, single-side length ≤ 150cm (oversize items require a “special loading slot” and an oversize surcharge).
Avoid overpacking: For example, using a 5-layer corrugated box with a large amount of foam for a small 1kg item will increase the volume and weight, leading to higher freight rates. Also, avoid underpacking: For example, using a single-layer cardboard box for heavy machinery parts can easily lead to damage and loss of the item.
Safety precautions reduce transportation risks.
Corners and edges should be reinforced with paper or plastic corner protectors to prevent them from being crushed or deformed during transport.
Items with sharp edges (such as metal parts or tools) should be wrapped in foam or plastic to prevent them from puncturing the packaging or scratching other items.
For valuable items (such as jewelry and watches), it is recommended to place an anti-theft tag or fragile warning sticker inside the packaging and select insured shipping to minimize losses from loss or damage.
Confirm special requirements in advance to avoid customs clearance delays in the destination country.
Some countries have specific packaging regulations: Australia, for example, requires all wooden packaging to be fumigated (IPPC marking), and Japan prohibits the use of straw as filler (to prevent pests and diseases). Please confirm these requirements with your freight forwarder or the recipient in the destination country in advance.
Food and pharmaceutical packaging must meet hygiene standards. For example, food packaging must use food-grade materials (such as PP plastic or kraft paper) and be labeled “For Food Contact” to avoid detention by customs in the destination country due to non-compliant packaging materials.
- Packaging Checklist (Must-Check Before Shipment):
Is the outer packaging intact and free of damage, moisture, or deformation?
Is the inner packaging adequately cushioned, preventing vibration and collision risks?
Is dangerous goods/electrical goods packaged in UN-certified packaging, and are the labels complete?
Are special requirements of the destination country (such as fumigation and environmentally friendly materials) met?
Is labeling clear: recipient information, warning labels, weights, and dimensions accurate?
Are sealing/leakage prevention measures in place? (Liquid and fresh produce items are particularly important for this check.)
Following these guidelines can significantly reduce transportation risks associated with packaging issues and ensure that goods arrive safely and in compliance with regulations. If you are unsure about the packaging of a specific type of cargo, we recommend consulting a professional air freight forwarder or airline for a customized packaging solution.
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