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HDF Board Standard GB∕T 31765-2015

This standard specifies the definition, category, requirements,testing manners,rules of inspection, marks, package, transportation and storage of high density fiberboard.

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QUALITY CONTROL STANDARD-HIGH DENSITY FIBERBOARD


SCOPE

This standard specifies the definition, category, requirements,testing manners,rules of inspection, marks, package, transportation and storage of high density fiberboard.

This standard is applicable to high density fiberboard of dry production.


TECHNICAL REQUIREMENTS

 

Size and Deviation

Item

Nominal thickness t/mm

t8

8≤t≤12

t12

Difference of thickness

not sanded

-0.3~+1.5mm

-0.3~+1.5mm

-0.3~+1.7mm

sanded

±0.2mm

±0.3mm

±0.3mm

Length and width

±2.0mm/m,the maximum value ± 5mm

Perpendicularity

2.0 mm/m

The width of all measurement points on every sanded board shall fall within the range of its arithmetic average value ±0.15mm.

 

The Appearance & Quality Requirements

Name

Quality Requirements

Allowable range

Superior

Qualified

Layeringblistering or carbonization

Not allowed

Partial softness

2000mm2

the area on one board shall ≤2000 mm2

Not allowed

3 parts

Losses on edges

the width ≤10mm

Not allowed

2 parts

Greasestains or foreign matters

40mm2

the area on one board shall ≤40 mm2

Not allowed

1 part

Press markssanding imprint

Not allowed

Allowed

There shall be no more than 2 kinds of appearance defects on the same flooring board.

 

Physical and Chemical Performance Requirements

 

Density, density difference inside the board and moisture content

Item

Nominal thickness t/mm

t8

8≤t≤12

t12

Density

0.80 g/cm3

Density difference inside the board

±10.0 %

Moisture content

3.0~13.0 %


Performance of general purpose high density fiberboard

Performance

Thickness Range/mm

≥1.5~3.5

3.5~6

6~9

9~13

13~22

MOR(Modulus of Rupture)

38.0 MPa

37.0MPa

36.0MPa

35.0MPa

35.0MPa

MOE(Modulus of Elasticity)

3900MPa

3800MPa

3600MPa

3500MPa

3200MPa

IB(internal bond strength)

1.2MPa

1.2MPa

1.2MPa

1.0MPa

1.0MPa

SS(surface soundness)

0.8MPa

0.9MPa

1.0MPa

1.2MPa

1.2MPa

Expansion rate of thickness after water absorption

16.0%

14.0%

12.0%

10.0%

6.0%

Anti-dampness performance

Option 1:

IB(internal bond strength)after circulation test

0.40MPa

0.40MPa

0.40MPa

0.35MPa

0.35MPa

Expansion rate of thickness after water absorption after circulation test

18.0%

16.0%

14.0%

11.0%

11.0%

Option 2:

IB(internal bond strength)after boiling water test

0.40MPa

0.40MPa

0.40MPa

0.30MPa

0.30MPa

Option 3: Wet MOR(Modulus of Rupture) after dipping in 70℃environment

15.0MPa

15.0MPa

15.0MPa

15.0MPa

13.0MPa



Performance of high-humid high density fiberboardHDF-GP HMR

Item

Thickness Range/mm

≥3.5~6

6~9

9~13

13~22

MOR(Modulus of Rupture)

42.0MPa

42.0MPa

40.0MPa

38.0MPa

MOE(Modulus of Elasticity)

3800MPa

3600MPa

3500MPa

3200MPa

IB(internal bond strength)

1.2MPa

1.2MPa

1.0MPa

1.0MPa

SS(surface soundness)

0.9MPa

1.0MPa

1.2MPa

1.5MPa

Expansion rate of thickness after water absorption

12.0%

10.0%

8.0%

5.0%

Anti-dampness performance

Option1:

IB(internal bond strength)after circulation test

0.5MPa

0.5MPa

0.45MPa

0.45MPa

Expansion rate of thickness after water absorption after circulation test

14.0%

12.0%

10.0%

9.0%

Option 2:

IB(internal bond strength)after boiling water test

0.50MPa

0.50MPa

0.40MPa

0.40MPa

Option 3: Wet MOR(Modulus of Rupture) after dipping in 70℃environment

20.0MPa

20.0MPa

20.0MPa

18.0MPa

 

PackageTransportation and Storage


Package

The products shall be packed based on their categories and specifications. On each package, the product name,category,grade,factory name, factory address, brand, specification & dimensions, quantity, standard code of product and inspection labels with formaldehyde emission limit marks

 

Transportation and Storage

Products shall be placed carefully on the flat ground during transportation, and shall be kept safe from dampness, rain, exposure to strong sunlight and distortions.


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