Gost 26002-83 Larch lumber

Rough lumber of coniferous species.
Interpretation of Russian export grading rules in accordance to GOST 26002-83

1. Dimensions:

1.1 Sawn lumber is subdivided:

1.2. Nominal thickness and width are guided by standard GOST 24454-80, where thickness of the lumber shall not exceed 100 mm.

1.3. Lengths of lumber are ranged:
from 1500 mm and up with a step of 300 mm;
from 450 mm up to 1350 mm with a step of 150 mm;
Lumber with length from 450 mm up to 1350 mm is manufactured by an order of State foreign trade organization.

1.4. Nominal dimensions of lumber are established for the wood of MC (moisture content) 20%. With MC of more or less than 20%, actual thickness and width of lumber shall be more or less than nominal dimensions in correlation with shrinkage value according to standard GOST 6782.1-75.

1.5. Limiting deviations from nominal dimensions of lumber shall not exceed in mm:

Volume of lumber with maximum admitted deviations shall not exceed 25% of total volume of lumber.

2. Technical Requirements

2.1. Lumber shall be manufactured in accordance to the requirements of the present technology standard for the wood of Pine, Spruce, Fir and Larch species.

2.2. Lumber is subdivided by quality of the wood and by its machining into 1, 2, 3, 4 and 5 grades.

2.3. Lumber is arranged:
By dimensions;
By species;
By grades:

U/S Unsorted (combining 1, 2, 3 grades together, the percentage correlation of which shall correspond to the natural recovery of lumber while sawing);

            4 grade separately;

            5 grade separately;

            Up to 15% of Fir is admitted in a load of Spruce lumber. 

2.4. MC moisture content of lumber shall not exceed 22%. Variation of the moisture content is admitted by custom orders.

2.5. Antiseptic treatment of lumber is per standard GOST 10950-78.

2.6. Quality of the wood and manufacture of lumber shall correspond to the requirements specified in tables 1-3.