Public reference specification
| Parameter | Published reference | How to verify |
|---|---|---|
| Plant part | Bark, not twig | Check and record against the agreed specification |
| Dimensions | Length, width or diameter, and bark thickness — to agreed specification. | Check and record against the agreed specification |
| Moisture | ≤16.0% — GB/T 42780-2023 | Request a laboratory test tied to the identified sample or lot |
| Total ash, dry basis | ≤5.0% — GB/T 42780-2023 | Request a laboratory test tied to the identified sample or lot |
| Volatile oil, dry basis | ≥1.50 mL/100 g — GB/T 42780-2023 | Request a laboratory test tied to the identified sample or lot |
| Cleanliness | Foreign matter, defects and visual acceptance agreed against the sample. | Check and record against the agreed specification |
| Required tests | Destination- and use-specific; results tied to the relevant lot. | Check and record against the agreed specification |
| Foreign matter | No public default; confirm the limit in the agreed specification | Request a physical check of the identified sample or lot |
| Sulfur dioxide (SO₂) | No public default; confirm the destination limit and test scope | Confirm the requirement, then request the matching laboratory test |
| Origin | China; cultivation region specified with the offer | Check the supplier record and lot identity |
| Form | Deliberately cross-cut bark curls, rings or pieces | Match the identified sample to the written order |
| Packaging | Bulk and retail/foodservice packing; see the supply-format options. | Match the packing specification to the packing check |
Public reference values for specification discussions, not current-lot results. Confirm the agreed limits and the identified sample or lot evidence before ordering.