ISO 16895-2:2010

INTERNATIONAL ISO
STANDARD 16895-2
First edition
2010-11-01

Wood-based panels — Dry-process
fibreboard —
Part 2:
Requirements
Panneaux à base de bois — Panneaux de fibres obtenus par procédé
à sec —
Partie 2: Exigences




Reference number
ISO 16895-2:2010(E)
©
ISO 2010

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ISO 16895-2:2010(E)
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ii © ISO 2010 – All rights reserved

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ISO 16895-2:2010(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Terms, definitions and abbreviations.2
4 Expression of specification limits and general requirements.2
4.1 Expression of specification limits .2
4.2 Lower specification limits .3
4.3 Upper specification limits.3
4.4 Moisture resistance requirement options.3
4.5 Density variation, dimension and moisture content requirements.4
4.6 Formaldehyde emission requirements .4
4.7 Load bearing particleboard .4
5 Specific property requirements for ultra-low-density fibreboard .5
6 Specific property requirements for low-density fibreboard.5
6.1 General .5
6.2 Requirements for furniture type low-density fibreboard for use in dry conditions .5
6.3 Requirements for general purpose low-density fibreboard for use in humid conditions .6
6.4 Requirements for furniture type low-density fibreboard for use in humid conditions .7
6.5 Requirements for general purpose low-density fibreboard for use in high humid
conditions .8
6.6 Requirements for furniture type low-density fibreboard for use in high humid conditions .9
7 Specific property requirements for medium-density fibreboard.10
7.1 General .10
7.2 Requirements for general purpose medium-density fibreboard for use in dry conditions.10
7.3 Requirements for furniture type medium-density fibreboard for use in dry conditions .10
7.4 Requirements for load bearing medium-density fibreboard for use in dry conditions .11
7.5 Requirements for general purpose medium-density fibreboard for use in humid
conditions .11
7.6 Requirements for furniture type medium-density fibreboard for use in humid conditions .12
7.7 Requirements for load bearing medium-density fibreboard for use in humid conditions.13
7.8 Requirements for general purpose medium-density fibreboard for use in high humid
conditions .14
7.9 Requirements for furniture type medium-density fibreboard for use in high humid
conditions .15
7.10 Requirements for load bearing medium-density fibreboard for use in high humid
conditions .16
7.11 Requirements for fitments type medium-density fibreboard for use in exterior conditions.17
8 Specific property requirements for high-density fibreboard.18
8.1 General .18
8.2 Requirements for general purpose high-density fibreboard for use in dry conditions.18
8.3 Requirements for general purpose high-density fibreboard for use in humid conditions.18
8.4 Requirements for general purpose high-density fibreboard for use in high humid
conditions .19
9 Marking.19
Annex A (normative) Calculation of 5-percentile and 95-percentile values .20

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ISO 16895-2:2010(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 16895-2 was prepared by Technical Committee ISO/TC 89, Wood-based panels, Subcommittee SC 1,
Fibre boards.
ISO 16895 consists of the following parts, under the general title Wood-based panels — Dry-process
fibreboard:
⎯ Part 1: Classifications
⎯ Part 2: Requirements

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INTERNATIONAL STANDARD ISO 16895-2:2010(E)

Wood-based panels — Dry-process fibreboard —
Part 2:
Requirements
1 Scope
This part of ISO 16895 provides the manufacturing property requirements for uncoated dry-process fibreboard.
The values listed in this part of ISO 16895 relate to product properties used to classify fibreboards into one of
four types, UDF, LDF, MDF and HDF (see Clause 3), for use in one of four service conditions, REG, MR,
HMR and EXT. The values are not characteristic values to be used for design purposes.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 9426, Wood-based panels — Determination of dimensions of panels
ISO 9427, Wood-based panels — Determination of density
ISO 12460-1, Wood-based panels — Determination of formaldehyde release — Part 1: Formaldehyde
emission by the 1-cubic-metre chamber method
ISO 12460-2, Wood-based panels — Determination of formaldehyde release — Part 2: Small-scale chamber
method
ISO 12460-3, Wood-based panels — Determination of formaldehyde release — Part 3: Gas analysis method
ISO 12460-4, Wood-based panels — Determination of formaldehyde release — Part 4: Desiccator method
ISO 12460-5, Wood-based panels — Determination of formaldehyde release — Part 5: Perforator method
ISO 16572, Timber structures — Wood-based panels — Test methods for structural properties
ISO 16895-1, Wood-based panels — Dry-process fibreboard — Part 1: Classifications
ISO 16978, Wood-based panels — Determination of modulus of elasticity in bending and of bending strength
ISO 16979, Wood-based panels — Determination of moisture content
ISO 16981, Wood-based panels — Determination of surface soundness
ISO 16983, Wood-based panels — Determination of swelling in thickness after immersion in water
ISO 16984, Wood-based panels — Determination of tensile strength perpendicular to the plane of the panel
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ISO 16895-2:2010(E)
ISO 16987, Wood-based panels — Determination of moisture resistance under cyclic test conditions
ISO 16998, Wood-based panels — Determination of moisture resistance — Boil test
ISO 17064, Wood-based panels — Fibreboard, particleboard and oriented strand board (OSB) — Vocabulary
ISO 20585, Wood-based panels — Determination of wet bending strength after immersion in water at 70 °C or
100 °C (boiling temperature)
3 Terms, definitions and abbreviations
For the purposes of this document, the terms and definitions given in ISO 17064 and ISO 16895-1 and the
following abbreviations apply.
EXT exterior
FN furniture
GP general purpose
HDF high-density fibreboard
HMR highly moisture resistant
LB load bearing
LDF low-density fibreboard
MDF medium-density fibreboard
MR moisture resistant
REG regular
UDF ultra-low-density fibreboard
4 Expression of specification limits and general requirements
4.1 Expression of specification limits
This International Standard may be used to evaluate groups of panels or production batches. To evaluate a
group of panels, this requires that:
a) The mandatory tests of ISO 16895-1, Tables 5 to 8, be applied to samples of the group. Conditioning of
test specimens is required and is specified in each test method.
b) The results of the tests be evaluated against the appropriate specification limits in Tables 1 to 19 of this
part of ISO 16895, according to the product type and thickness range of the panels. Tables 1 and 2 apply
to all product types and thickness ranges of panels.
For density variation and dimensions (Table 1), specification limits are based on the mean values for
individual panels (calculated in accordance with Annex A) and are maximum tolerances. For formaldehyde
emission, Table 2 gives upper specification limits for individual panel results.
Specification limits in Tables 3 to 19 are based on 5 (lower) or 95 (upper) percentile expressions, according to
4.2 and 4.3.
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ISO 16895-2:2010(E)
Dry-process fibreboards shall comply with the relevant requirements of this International Standard when
despatched from the producing factory.
4.2 Lower specification limits
The requirements in Tables 3 to 21 are the lower specification limits for the following properties:
a) bending strength [modulus of rupture (MOR)];
b) modulus of elasticity (MOE);
c) internal bond strength;
d) surface soundness;
e) internal bond strength after cyclic test;
f) internal bond strength after boil test;
g) wet bending strength.
The 5-percentile values based on the mean values for individual panels and calculated in accordance with
Annex A shall be equal to or greater than the lower specification limits in Tables 3 to 21.
4.3 Upper specification limits
The requirements in Tables 3 to 21 are the upper specification limits for the following properties:
a) thickness swell after 24 h.
b) thickness swell after cyclic test.
The 95-percentile values based on the mean values for individual panels and calculated in accordance with
Annex A shall be equal to or less than the upper specification limits in Tables 3 to 21.
4.4 Moisture resistance requirement options
Requirements for moisture resistance are dependent upon the test method employed to assess this property.
Three alternative sets of requirements (Option 1, Option 2 and Option 3) are set out in Tables 5 to 8, 12 to 18,
20 and 21 corresponding to the three principal recognized methods of evaluation. It is necessary to show
compliance with only one of these three options, as follows:
⎯ Option 1:   Requirements apply to those fibreboards subjected to a cyclic accelerated ageing test,
followed by the determination of thickness swell and internal bond, as described in ISO 16987.
⎯ Option 2:   Requirements apply to those fibreboards subjected to an accelerated ageing test, consisting
of immersion in boiling water followed by determination of internal bond, as described in ISO 16998.
⎯ Option 3:   Requirements apply to those fibreboards subjected to an accelerated ageing test consisting
of determination of the wet bending strength following immersion in water at 70 °C or immersion in boiling
water for exterior grade products, as described in Method A or Method B of ISO 20585.
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ISO 16895-2:2010(E)
4.5 Density variation, dimension and moisture content requirements
At least 95 % of the mean values of the individual panels shall be within the maximum tolerances stated in
Table 1.
Density ranges given for each product type in Clauses 5, 6, 7 and 8 are a guide only and not a mandatory
specification. Products may be designated as a particular type if they meet the specified requirements for that
type.
Table 1 — Requirements for density variation, dimensions and moisture content
Property Test method Requirement
Density variation within panel ISO 9427 ±10 % max from mean
Length and width ISO 9426 ±2 mm/m, max. ±5 mm
Squareness ISO 9426 < 2 mm/m
Thickness range (mm, nominal)
Thickness ISO 9426
< 8 W 8 to 12 > 12
−0,3 −0,3 −0,5
 — Unsanded board
+1,5 +1,5 +1,7
 — Sanded board ±0,2 ±0,3 ±0,3
Moisture content (advisory only) ISO 16979 5 to 13 %
4.6 Formaldehyde emission requirements
Compliance with formaldehyde requirements can be confirmed by applying one test method only of those
listed in Table 2. The reference chamber method can take up to four weeks for each test to be completed. The
other tests are designated production control methods because one test can be completed within 24 h. Each
individual panel result shall comply with the specification limits stated in Table 2 for the selected method.
Table 2 — Maximum emission limits of formaldehyde for fibreboard
Test method and units
Production control methods
Reference chamber
Small chamber
method
Gas analysis method Desiccator method Perforator method
method
ISO 12460-1 ISO 12460-2 ISO 12460-3 ISO 12460-4 ISO 12460-5
Emission Emission Emission Emission Content
3 2
mg/m ppm mg/m/h mg/L mg/100 g
a
0,124 3,5 0,7 8
NOTE National regulations may impose restrictions on the use of boards of particular formaldehyde emission levels.
a
If the small chamber method or any other method is used for production control, correlations should be established with the
reference chamber method to determine the emission value that is equivalent to the chamber method limit value stated in this table.
Correlations may be regional, national, company or plant specific as appropriate.
4.7 Load bearing particleboard
When fibreboard is classified as “load bearing” (LB) and nominated for structural applications, characteristic
strength and stiffness values shall be established based upon testing in accordance with ISO 16572 or
equivalent ASTM or EN standards. Alternatively, for specific load bearing applications (e.g. walls, roofs, floors,
I-joist webs), the load bearing fibreboard shall meet the specific performance requirements for that intended
application.
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ISO 16895-2:2010(E)
5 Specific property requirements for ultra-low-density fibreboard
3
Ultra low-density fibreboards have a nominal density of less than 550 kg/m .
Requirements for UDF-FN REG fibreboard are listed in Table 3.
Table 3 — Requirements for UDF-FN REG
Requirement
Property Test method Units Thickness ranges (mm, nominal)
> 9 to 13 > 9 to 13 > 9 to 13 > 9 to 13
Bending strength (MOR) ISO 16978 MPa 18 14 13 12
Internal bond strength ISO 16984 MPa 0,35 0,35 0,30 0,30
24 h thickness swell ISO 16983 % 18 14 13 12

6 Specific property requirements for low-density fibreboard
6.1 General
3
Low-density fibreboards have a nominal density of 550 to 650 kg/m .
6.2 Requirements for furniture type low-density fibreboard for use in dry conditions
Requirements for LDF-FN REG fibreboard are listed in Table 4.
Table 4 — Requirements for LDF-FN REG fibreboard
Requirement
Property Test methodUnits Thickness ranges (mm, nominal)
> 6 to 9 > 9 to 13 > 13 to 22 > 22 to 34 > 34
Bending strength (MOR) ISO 16978 MPa 20 20 18 15 14
Modulus of elasticity (MOE) ISO 16987 MPa 1 700 1 700 1 600 1 400 1 100
Internal bond strength ISO 16984 MPa 0,45 0,45 0,45 0,40 0,35
24 h thickness swell ISO 16983 % 20 16 14 12 11

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ISO 16895-2:2010(E)
6.3 Requirements for general purpose low-density fibreboard for use in humid conditions
Requirements for LDF-GP MR fibreboard are listed in Table 5.
Table 5 — Requirements for LDF-GP MR fibreboard
Requirement
Property Test method Units
Thickness ranges (mm, nominal)
> 6 to 9 > 9 to 13 > 13 to 22 > 22 to 34 > 34
Bending strength (MOR) ISO 16978 MPa 20 20 18 16 14
Modulus of elasticity (MOE) ISO 16987 MPa 1 700 1 700 1 600 1 500 1 300
Internal bond strength ISO 16984 MPa 0,45 0,45 0,45 0,45 0,40
24 h thickness swell ISO 16983 % 18 16 13 12 10
Moisture resistance
Option 1:
Internal bond strength after
cyclic test ISO 16987 MPa 0,25 0,18 0,16 0,13 0,10
Thickness swe
...