Level of state of People's Republic of China
GB4817.2 of classify of broadleaf sawn timber - 84 replace GB153 - 79
Broad Leaves Sawn Timber Grading

This standard applies to broadleaf common sawn timber and special grade seize material, make to limit of the classify of sawn timber, blemish decide now.

The cent of common sawn timber in a standard is one, 2, third class.

2 blemish limit sees next tables:

Blemish name check measures a method to allow limit Special grade sawn timber is common sawn timber First-class and second-class third class The largest size must not exceed dead red-letter day material is wide
Aleatoric material grows a number inside 1m limits to must not exceed 10%
2 20%
4 40%
6 are not restricted Decayed area must not exceed those who be in material area area to must not have must not have 10% 25% Crackle places leather length to must not exceed the 10% 15% 40% with senior capable person to not be restricted Material of insect pest random grows a number inside 1m limits to must not exceed must not have must not 8 is not restricted Wane is short of horny size the badliest, must not exceed the 15% 25% 50% 80% with wide material Curve unexpected turn to must not exceed
Suitable turn must not exceed 0.5%
1% 1%
2% 2%
3% 4%
Do not be restricted Slant height of twill twill bend must not exceed the 5% 10% 20% with long level to not be restricted

Note: Length is not worth 2 meters off grade class, its blemish allows limit not under third class.

Law of 3 check proved recipe presses GB4822.3-84 " sawn timber examines grade assess " carry out.

Add specification:

This standard is put forward by ministry of forestry of People's Republic of China.

This standard is drafted by sawn timber drafting group of standard.