Normal Thickness |
Distance of any point on the upper surface of the veneer that deviates from the light weight straight ruler |
|
Veneer length 500 |
Veneer length 1000 |
|
≤15 |
2.0 |
4.0 |
>15..≤25 |
1.5 |
3.0 |
>25..≤60 |
1.0 |
2.0 |
>60 |
1.0 |
1.5 |
Appearance Quality
Item |
Allowed Range |
Swelling |
Not Allowed |
Cracking |
|
Dead Knot |
|
Foreign-body Adhering |
|
Insect Hole |
|
Rot |
|
Contamination |
|
Bruising |
A few allowed, not effect in usage |
Impression |
|
Color-odds and splash |
|
Patches per sq.m on surface |
≤3 |
GB Test Item— Before delivery Factory inspection
Test Item |
Unit |
Standard |
Test Method |
|
Vertical Bending Strength |
Toward A |
Mpa |
≥65 |
GB/T2634—2008 Test Standard |
Toward B |
≥65 |
|||
Vertical Bending modulus of elasticity |
Toward A |
Gpa |
≥8 |
|
Toward B |
≥8 |
|||
Compressibility (under 20MPa) |
Toward C |
% |
≤3 |
|
Crev |
≥70 |
|||
Impact strength (side test) |
Toward A |
KJ/㎡ |
≥13 |
|
Toward B |
≥13 |
|||
Interlaminar shear strength |
Mpa |
≥8 |
||
Vertical electric strength (90 ℃ + 2 ℃) |
KV/mm |
≥11 |
||
Vertical electric strength (90 ℃ + 2 ℃) |
KV |
≥50 |
||
Performance density |
g/cm³ |
>1.1~1.2 |
||
water content |
% |
≤6 |
||
Shrinkage after drying |
Toward A |
% |
≤0.3 |
|
Toward B |
≤0.3 |
|||
Toward thickness |
≤3 |
|||
Oil absorption |
% |
≥8 |