A pump housing can pass dimensional inspection and still arrive with a damaged sealing face. Aluminum casting packaging should preserve the agreed condition of the part from final inspection through transport, storage and unpacking. Start with the surfaces that matter to assembly, then define how the package supports, separates and protects them.
Start with a drawing-based protection map
Mark the functional areas on the controlled drawing: gasket faces, bearing bores, O-ring grooves, port threads, internal passages and thin or projecting features. For each area, identify the delivered condition and what the receiving team must be able to verify.
Distinguish surfaces that may contact a support from surfaces that must remain clear. Ask the packaging proposal to show the part orientation, contact points and separation between neighboring pieces. A machined face should not become a support point simply because it is convenient to stack.
Describe acceptance in observable terms. For example, identify which drawing-defined sealing areas require examination for dents, scratches or transferred material. Define cosmetic zones separately from functional ones. Any numerical damage limit or inspection method needs agreement for the particular component.
Control movement and contact inside the package
Review what stops each casting from sliding, rotating or contacting another part during handling. A soft wrap can separate surfaces, but the proposal also needs a way to control movement under the intended transport conditions.
Ask the supplier to identify suitable locating supports, separators or fitted inserts and explain where the load passes through the casting and container. Review ribs, thin walls, projecting bosses and finished edges before accepting those contact points. For heavier housings, agree on handling equipment and access without improvising lifting points on the component.
Check packaging materials against the delivered finish, cleanliness requirement and next operation. Discuss abrasion, loose fibers, adhesive residue and compatibility with later washing, bonding or coating. If oil or a corrosion-inhibiting material is proposed, require approval for the actual alloy, finish and assembly process. It should not be an automatic addition to every machined aluminum order.
Protect bores, threads and internal passages
For exposed ports and bores, define whether a cap, plug or other cover is needed and how it is retained. The protection should remain identifiable and removable without damaging the controlled surface. A transport plug is not a pressure-rated closure unless separately specified and qualified for that role.
Map every temporary closure in the packing instruction. This is particularly useful for valve bodies and pump housings with multiple openings: the receiving or assembly team needs to know what to remove and which openings should have been protected.
Specify the cleaning and drying state before packing, including how any residual liquid in internal passages is addressed. Wrapping a part does not establish its cleanliness. Agree on the required evidence where particle or residue control is part of acceptance, and avoid packing materials that can enter an open passage.
Plan moisture control for the complete delivery route
Aluminum can develop water staining even though it does not form the familiar red rust of steel. The Aluminum Association explains that trapped moisture and condensation can cause staining, including when cold metal encounters warmer, humid air. Its guidance focuses mainly on sheet and coil; these moisture principles inform the review, but do not constitute a casting-specific packaging specification. [1]
For a casting order, document the expected route, storage conditions and time before unpacking. Ask how the proposed system addresses dry packing, moisture entry, temperature changes and conditions at the destination. A closed bag alone is not evidence that moisture is controlled.
Where a barrier system, desiccant or inhibitor is proposed, have the packaging specialist define its suitability, capacity, placement and opening instructions. The agreed solution also needs to remain compatible with the part's finish and downstream processing.
Review sample shipments and production pallets separately
A package used for a few first articles may not represent the later production shipment. Compare the number of parts, individual and total mass, internal arrangement, handling method and stacking conditions. Reusing the same outer box does not establish equivalent protection.
ISTA distinguishes test procedures by the packaged product and distribution environment. Its ocean-shipment guidance also highlights handling, load movement, humidity and connecting transport legs. A general packaging test should not be described as proof against every sea-freight condition. [2, 3]
Agree on the validation scope with the buyer, packaging specialist and any responsible test provider. Record the actual part and package configuration, test or trial-shipment conditions, and inspection criteria. If the part weight, supports, materials or shipment arrangement changes, review whether the earlier evidence remains applicable.
Example: protect a machined pump housing by feature
The following is an illustrative review for a machined aluminum pump housing, not a Bohua customer case or an approved packing instruction. Assume the drawing identifies a gasket face, a bearing bore and two threaded ports.
Gasket face: the proposal identifies this as a protected functional surface. The review checks the separator material, the clearance to neighboring parts and whether any support or fastening load reaches the face. Receiving inspection examines the agreed area against the drawing-defined condition.
Bearing bore: the proposal shows a removable cover and the surrounding support arrangement. The review checks whether the cover stays in place and can be removed without scoring the bore. The receiving checklist records cover presence and the required bore condition.
Threaded ports: the proposal identifies each temporary plug. The review checks retention, material compatibility and removal instructions. Receiving inspection reconciles the plug count and checks for damage or foreign material as specified.
Approve the package as a system. Adding a cover to one feature does not resolve movement, load transfer or moisture concerns elsewhere.
Keep labels and packing records usable at receiving
Agree on part number, drawing revision, quantity, lot reference and container identification. Place labels where they can be read in the delivered arrangement, and define how identity is preserved if an outer container is opened or quantities are repacked.
Keep different revisions or lots distinguishable according to the order requirements. Match the container references to the packing list and required inspection records. For the detailed connection between labels, heat numbers and processing batches, see Bohua's companion guide, Aluminum Casting Traceability: Heat Numbers to Shipment, in the engineering resources collection.
Specify any packing photographs or release records before shipment. Images can document the arrangement and labels, but do not replace the agreed checks on the protected surfaces or the validation of the packaging design.
Define receiving checks and the response to damage
Give the receiving team an agreed unpacking and inspection sequence. Review the outer container, evidence of moisture or impact, internal restraints, separators, temporary covers and the identified functional surfaces. Compare quantities and labels with the packing list.
If damage or contamination is found, identify and hold the affected material under the buyer's quality process. Record the container and lot references, the observed condition and photographs before discarding packaging or changing the evidence. Follow the agreed notification and disposition process.
Do not automatically polish a sealing face, chase a damaged thread or clean away an unexplained deposit to make the delivery look acceptable. Determine the required assessment and obtain any necessary repair authorization first. Feed the finding back into the packaging review, distinguishing observed damage from assumptions about where it occurred.
Prepare a packaging brief for Bohua's quotation review
Bohua supports aluminum casting, CNC machining of functional surfaces and export-oriented delivery. Its published capabilities state that packaging and delivery details are confirmed per program. Bring those requirements into the quotation discussion alongside the drawing, alloy, machining scope and annual volume. [4]
Use the Specifications table below as a packaging-review worksheet. Its entries describe information to agree; they are not fixed Bohua packaging parameters. Ask the quotation to distinguish included protection, any additional packaging or validation cost, and responsibilities for approval and receiving checks.
Use Start RFQ below to share the component requirements and request a manufacturing and packaging-scope review. Include the important surfaces, intended shipment method, storage expectations and any existing customer packing instruction.
Sources and further reading
[1] The Aluminum Association, Guidelines for Minimizing Water Staining of Aluminum, fifth edition, May 2009. General moisture principles; primarily sheet and coil guidance. aluminum.org/sites/default/files/2021-11/WaterStainingGuidelines.pdf
[2] International Safe Transit Association, Test Procedures. ista.org/test_procedures.php
[3] ISTA, What test should I select for ocean shipments? support.ista.org/portal/en/kb/articles/ocean
[4] Bohua Casting, Casting Capabilities. www.bohua-casting.com/capabilities
Related Bohua guide: Aluminum Casting Traceability: Heat Numbers to Shipment. www.bohua-casting.com/en/resources/aluminum-casting-traceability-heat-lot-records/
Sources reviewed on 23 September 2026. The feature example and worksheet are buyer planning tools; project requirements determine the approved packing instruction.
Specifications
| Part and delivery state | Record the part number, drawing revision, finish, cleaning state and surfaces requiring protection. |
|---|---|
| Contact and separation | Identify permitted support locations, protected areas, separators, part orientation and movement restraints. |
| Temporary closures | List each cap or plug, its location, material, retention and removal instruction. |
| Moisture and materials | Agree on dry packing, material compatibility, moisture-control scope and storage or opening instructions. |
| Pack quantity and handling | Define pieces per container, package mass, pallet arrangement, handling access and approved stacking conditions. |
| Identification | Specify labels, lot and revision separation, packing-list references and repacking controls. |
| Validation and approval | Identify the representative package, intended route, acceptance checks, evidence and approval owner. |
| Receiving and exceptions | Agree on unpacking checks, condition records, notification contacts and disposition of affected parts. |
FAQ
Is an outer carton enough for machined aluminum castings?
Review the whole arrangement: supports, separation, movement restraints, surface protection and the intended handling route. The suitability of an outer carton depends on the part and package configuration; its presence alone does not demonstrate adequate protection.
Should all aluminum castings receive protective oil before shipping?
Agree on any oil or inhibitor for the specific alloy, finish, cleanliness requirement and next operation. Identify removal requirements and buyer restrictions. Do not apply a universal treatment to parts that may later be bonded, coated or assembled under controlled cleanliness conditions.
Can transport plugs be used as pressure-test closures?
Only if that use has been separately specified and qualified. A temporary cap or plug intended to protect a port during delivery should not be assumed to withstand a test pressure or provide the required sealing performance.
What should a buyer send for a packaging review?
Provide the controlled drawing, delivered finish, protected functional areas, cleanliness requirements, shipment method, expected storage conditions, quantities and any customer packing instruction. Include receiving acceptance requirements and identify who approves the final arrangement.