Forestry Statistics
Log Grade Specification
| Log Grade |
Small end Diameter (mm) |
Maximum Large end Diameter (mm) |
Maximum Knot size (mm) |
Length (m) |
Percentage allowed |
Sweep |
|---|---|---|---|---|---|---|
| Pruned peelers | 300+ | No limit | 0 | 4.0, 6.0 | Shippers option | d/4 |
| Japan A | 200-340 | 800 | d/3 up to 150 mm max Excessive number of large knots not permitted |
4.0 8.0 12.0 |
10% max balance 50% min |
d/4 d/2 d |
| Japan J | 200-260 | No limit | d/3 up to 150 mm max Excessive number of large knots not permitted |
4.0 8.0 12.0 |
10% max balance 50% min |
d/4 d/2 d |
| Korea K | 200-260 | No limit | d/3 up to 150 mm max Excessive number of large knots not permitted |
3.6 5.4 7.3 11.0 |
balance 10% max balance 40% min |
d/4 d/4 d/2 d |
| Pulp (Japan) | 100+ | No limit | No limit | 4.0, 6.0, 8.0 |
Shipper's option | No limit |
Note: d= small end diameter
For export grades, small end diameter is measured at the wharf under the Japanese Agricultural Standard (JAS) convention, i.e., rounded down to the nearest even two-centimetre interval.
Domestic Log Grades (Forest Research Specification)
| Log Grade | Log status |
Small end Diameter (mm) |
Maximum Knot (mm) |
Sweep class |
|---|---|---|---|---|
| P1 | Pruned | 400+ | 0 | 1 |
| P2 | Pruned | 300-399 | 0 | 1 |
| S1 | Unpruned | 400+ | 60 | 1 |
| S2 | Unpruned | 300-399 | 60 | 1 |
| S3 | Pruned or unpruned | 200-299 | 60 | 1 |
| L1 | Unpruned | 400+ | 140 | 1 |
| L2 | Unpruned | 300-399 | 140 | 1 |
| L3 | Unpruned | 200-299 | 140 | 1 |
| Pulp | Unpruned | 100 | n/a | 2 |
| Maximum Permissible Sweep*: | ||||
|---|---|---|---|---|
| Length | <3.7 | 3.7-4.8 | 4.9-7.6 | >7.6 |
| Class1 | d/8 | d/4 | d/3 | d/2 |
| Class2 | d | 2d | 3d | 4d |
Source: Forest Research
Note: d = small end diameter
* Sweep is the maximum deviation from straightness along the length of the log.
Contact for Enquiries
Senior Analyst
Ministry of Agriculture and Forestry
PO Box 1340
Rotorua
NEW ZEALAND
Phone: +64 7 921 3403
Fax: +64 7 921 3402
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