Diamond powder packing has one job: deliver the same particle size and the same cleanliness that left the factory. Everything else, including how the carton looks, is secondary to moisture, contamination and identification.
What Packing Has To Protect Against
- Moisture. Fine diamond holds surface moisture, which causes caking and changes dispersion behaviour in slurry work.
- Contamination. A single grain of coarse material in a fine lot creates scratches that cannot be explained by the certificate.
- Loss. Fine powder is hard to contain and easy to lose; a pinhole in an inner bag becomes a visible shortfall on a 100 g order.
- Misidentification. Two similar bags with different grades and no clear label is the most common cause of a production error at the customer end.
Sample, Trial And Bulk Behave Differently
| Order type | Typical purpose | Packing priority |
|---|---|---|
| Sample | Feasibility test on one machine | Exact grade identification, small sealed inner pack, certificate inside |
| Trial | Full process run over several days | Consistent sub-packs so each day’s use comes from a sealed unit |
| Production | Routine consumption | Moisture barrier, robust outer, label that survives handling |
| Coated product | Bonded tool production | Coating protection, no abrasion between particles in transit |
For coated material there is an extra consideration: the coating can be damaged by particle-to-particle abrasion during transport. Inner packing that limits movement matters more than outer strength.
The Label Is Part Of The Product
A working label carries the product code, the grade and size range, the lot number, the net weight, the production date and the hazard identification required for the destination country. Anything less invites a mixing error.
Neutral labelling is normal for distributors and is arranged per order. Own-brand labelling requires artwork and usually a minimum quantity, so it should be raised at quotation rather than after production.
Documents That Travel With The Goods
Export orders normally need a commercial invoice, packing list, and the safety data sheet. Some destinations ask for a certificate of origin, and some customers require a certificate of analysis for the specific lot in the shipment. Getting these right at booking avoids a container sitting at port.
Where REACH or similar regulation applies, the declaration should be prepared before shipping, not after. See SDS and REACH documents.
Packing Versus Process
Packing cannot fix a dispersion problem, but it can cause one. If a customer reports that a slurry made from a new shipment behaves differently from the previous one, the first questions are about moisture and about whether the inner bag was opened and resealed over several weeks.
Inner And Outer: Two Different Jobs
Inner packaging contains the product; outer packaging survives the journey. Confusing the two is how shipments arrive intact on the outside and contaminated on the inside.
The inner pack has to be sealed, moisture-resistant and, for fine powder, static-controlled enough that material does not cling to the film and skew the net weight. The outer pack has to resist compression, stacking and handling, and it has to carry the shipping marks that customs and the consignee expect.
For coated grades, add one more requirement: the inner pack should limit particle movement. Abrasion between coated particles in transit can damage the layer before the customer opens the bag.
When Something Goes Wrong
Packaging disputes are settled by evidence. Photographs of the outer carton before opening, the inner pack as received, and the net weight on a calibrated scale answer most questions. Without them, a claim becomes one party’s word against another’s.
Two habits prevent most of these cases: photograph every shipment before dispatch, and ask the customer to photograph the pack before opening if the carton shows damage. Both take a minute and settle a week of correspondence.
Common Mistakes
- Choosing packing on price alone. The cost difference between an adequate moisture barrier and a thin one is small relative to a rejected batch.
- No lot number on the inner bag. Once the outer carton is opened, traceability is gone.
- Assuming the freight forwarder will handle documents. They move what you give them; the declarations are the shipper’s responsibility.
How To Verify
Ask for a packing specification before the first order: inner material, outer material, net weight per unit, labelling content and documents included. Then inspect the first shipment and keep photographs, because that becomes the reference for every later order.
Next Step
Products: HDY, MBD, N nickel-coated.
Related reading: how to send a useful inquiry.