桦树板材timber
厚度:两种,25mm,50mm
等级:ABgrade
长度:2-4m
宽度:100mm+
其他规格:
活结(活结:与周围结构有完整的纹理连接,未形成断裂,没有髓心结构。死结:与周围结构发生环形或半环形分离,干燥后易收缩漏空)
不带树皮,韧性好(中国进出口网)
Birch lumber specification:
thickness: 25mm, 50mm
Grade: ABC Grade
Length: 2-4m
live knots ,no dark
only positive tolerance +1+2mm
KD 10% max
one side clear
heart max 15% of the width
width 100mm+