- Specify a measurable range and tolerance.
- Define fines and the measurement point.
- Use representative sampling across the lot.
- Connect the grade to appliance requirements.
Specify a range and tolerance
Lump charcoal is irregular. A nominal range describes the pieces the buyer expects, but a real batch will contain material near and outside the boundaries. The contract should state how much undersize and oversize is acceptable and whether the percentage is measured by mass.
Define fines
Fines can arise during grading, bagging, pallet movement, container transport and last-mile handling. If the supplier measures at packing and the buyer measures after arrival, both results may be correct but commercially different. Agree the measurement point or establish an arrival allowance.
Use representative sampling
Opening one bag chosen for appearance is not representative. The inspection plan should define how bags are selected across the lot, how the sample is handled and which screens or measuring method are used. Keep the sample weight large enough for the distribution to mean something.
Connect grade to the appliance
Larger pieces often suit long restaurant service because they can support airflow and a durable bed. Smaller pieces can light and respond differently. The desired grade depends on grill depth, airflow, cooking style and replenishment. Run a controlled trial before setting the final range.
| Specification item | Question to answer |
|---|---|
| Target range | Which lower and upper piece dimensions define the main grade? |
| Undersize | What counts as fines and what mass percentage is allowed? |
| Oversize | Is there a maximum piece dimension or handling limit? |
| Sampling | How many bags, from where in the lot, and at which point? |
| Method | Which screens, equipment and calculation are used? |
Document the result
Record sample identity, date, lot, bag condition, total mass and mass in each fraction. Photographs help show the process, but the weights provide the decision basis. If arrival damage is a concern, compare packing and destination samples.
BRICAPAR buyer note: The same shipment can produce different fines results at packing and after arrival because charcoal breaks during handling. The contract should identify the measurement point or define an arrival allowance.