Laminate flooring quality standard

APPEARANCE

AC2/AC3/AC4
Item	Requirement
Defects	A & Acceptable qualities
	Front	Back
Frost and water marks	A: Not Allowed Acceptable：≤ 3% of the surface	Allowed
Scratches on the surface	Not Allowed	HDF exposed not allowed
Imprints on the surface	Not Allowed	Not Allowed
Holes	Not Allowed	Not Allowed
Gloss unevenness	A: Not Allowed Acceptable：≤3% of the surface	Allowed
Spots, dirt and similar surface defects	A: Not Allowed Acceptable：≤10 mm2, max 1/board	Allowed
Blisters	Not Allowed	Max 1/pc ≤ 10 mm2
Humps	Not Allowed	Max 1/pc ≤ 10 mm2
Defects on decorative paper	Not Allowed	Max 1/pc ≤ 100 mm (on balance paper)
Missing decorative or balance paper	Not Allowed	Maximum 1/pc ≤ 20 mm2
Edge defects	Allowed if they do not affect aesthetics after installation	Allowed
Cracks on the surface	Not Allowed	Not Allowed
Colour not even	Obvious unevennes not allowed	Allowed
Delamination	Not Allowed	Not Allowed
Missing or damaged locking systems or edges/corners	Not Allowed	Not Allowed

  DIMENSIONAL TOLERANCES

Item	Requirement
Tolerance in thickness	≤ 0.5 mm of the actual average thickness Difference between actual maximum and minimum thickness ≤0.5 mm
Tolerance in length	If the nominal length is ≤1500 mm, tolerance in length is ≤1 mm If the nominal length is ＞ 1500 mm, tolerance in length is ≤2 mm
Tolerance in width	≤0.1 mm of the actual average width Difference between actual maximum and minimum width ≤0.2 mm
Squareness	≤ 0.2 mm
Straightness	≤ 0.3 mm/m
Wing warp	Cup warping concave: Chord ≤ 0.15% of width Cup warping convex: Chord ≤ 0.2% of width Bow warping concave: Chord ≤ 0.5% of length Bow warping convex: Chord ≤ 1% of length
Space between connected boards	Average≤0.15 mm, max≤0.2 mm
Height difference between connected boards	Average≤0.1 mm, max≤0.15 mm

  PHYSICAL AND CHEMICAL PROPERTIES

Tests	Unit	A quality
Bending strength (Modulus of Rupture)	Mpa	≥35
Internal bond	Mpa	≥ 1
Board moisture content	%	3～10
Core board density	g/cm3	≥0.85
Thickness swelling 24 hrs	％	≤18
Adhesion test	Mpa	≥ 1
Surface resistance to changes in temperature		No cracks , no blisters
Surface resistance to scratches	N	4 N，decorative paper not scratched
Dimensional variations after relative humidity changes	mm	(≤0.9)
Surface resistance to cigarette burn		No black spots, no cracks, no blisters
Surface resistance to heating		No cracks , no blisters
Surface resistance to stain and rosion		No stain, no erosion
Surface resistance to cracking		No cracks under 6Xmagnifying glass
Abrasion class resistance	cycles	AC2 - Home useⅡ: ≥4000 AC3 - Home useⅠ: ≥6000 AC4 - Commercial use: ≥9000
Impact resistance	mm	Maximum: 12 (≤10)
Formaldehyde emission	mg/L	E0 ≤:0.5 E1≤:1.5
Colour Fastness	grade	≥ grade4 on gray colour card