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EU oak grade standard

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  • Reference Standards Detail

No. Item A grade B grade C grade D grade E grade
01 Grain Regular straight grain, mountain grain Regular straight grain, mountain grain, half straight grain  Straight grain, mountain grain, half straight grain 
Straight grain, mountain grain, messy grain
No limited
02 Live knots

φ≤8mm, 2pcs, color natural

φ≤15mm, 2-5pcs, color natural
φ≤60mm, spitting, color closely
Allowed, width≤ 1/3 width of flooring Allowed, width≤ 1/3 width of flooring

03

Dead knots Not allowed φ≤5mm, 1-2pcs, spitting, color closely
φ≤20mm, 1-3pcs, spitting, color closely
φ≤40mm, 2-4pcs, spitting, color closely
φ≤60mm, spitting, color closely
04 Pin knots Single spitting, overall color closely Small, spitting, color closely allowed Spitting, color closely allowed Spitting, color closely allowed
Spitting, color closely allowed
05 Side knots Not allowed Not allowed Allowed no drop, no cracking, not allowed dead knots Allowed no drop, no cracking, not allowed dead knots
Allowed no drop, no cracking, not allowed dead knots
06 Holes Not allowed φ≤1mm, 3-5pcs, spitting, not color changed
φ≤1mm, spitting, not color changed
φ≤1mm, spitting, not color changed
φ≤1mm, spitting, not color changed
07 Black Lines Not allowed Not allowed
1*100mm, 1-3lines, spitting 3*200mm, 3-5lines, spittng 3*200mm, 3-5lines, spittng
08 Pollution if the surface can be sanded allowed, oil not allowed if the surface can be sanded allowed, oil not allowed
if the surface can be sanded allowed, oil not allowed
if the surface can be sanded allowed, oil not allowed
if the surface can be sanded allowed, oil not allowed
09 Splits Not allowed Not allowed
3*300mm, 1-2lines, seams not allowed

5*300mm, 1-2lines,

seams not allowed

8*600mm, 1-3lines, seams not allowed
10 End Oxidation Not allowed Not allowed
Allowed a slight, but the color closely Allowed color closely, but the width≤1/4 of flooring width, sq.m≤5% Allowed color closely, but the width≤1/4 of flooring width, sq.m≤5%
11 Sub wood Not allowed Allowed a slight     Allow only one side, the width≤15% of flooring width Allow only one side, the width≤20% of flooring width
Allow only one side, the width≤30% of flooring width
12 color difference Not allowed Allowed a slight Coordination allowed Coordination allowed
Coordination allowed
13 Discoloration Not allowed Not allowed
Allowed slight natural discoloration, not allowed blue/yellow stained fungus Allowed slight natural discoloration, not allowed blue/yellow stained fungus
Allowed slight natural discoloration, not allowed blue/yellow stained fungus
14 Bark Pocket Not allowed Not allowed
2*30mm, 1 line 4*40mm, 3 lines 5*60mm, 3 lines
15 Watermark, spacer mark Not allowed Not allowed
Not allowed
Not allowed
Not allowed
16 Decay Not allowed Not allowed
Not allowed
Not allowed
Not allowed
17 Broken grain
Not allowed Not allowed
Not allowed
Not allowed
Not allowed
18 Tabby grain Not allowed Not allowed
Allowed strip, not allowed flake Allowed strip, not allowed flake
Allowed strip, not allowed flake

Usually is ABCD Grade, 15-20% AB grade, 80-85% CD grade; If the grade is ABCDE, should have 20% C grade. 









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