ISO 16893-2:2010

INTERNATIONAL ISO
STANDARD 16893-2
First edition
2010-11-01

Wood-based panels — Particleboard —
Part 2:
Requirements
Panneaux à base de bois — Panneaux de particules —
Partie 2: Exigences




Reference number
ISO 16893-2:2010(E)
©
ISO 2010

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ISO 16893-2:2010(E)
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ii © ISO 2010 – All rights reserved

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ISO 16893-2:2010(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 requirements .4
4.7 Requirements for load bearing particleboard for use in dry conditions (P-LB REG) .4
5 Specific property requirements .5
5.1 Requirements for general purpose particleboard for use in dry conditions (P-GP REG) .5
5.2 Requirements for furniture type particleboard for use in dry conditions (P-FN REG) .5
5.3 Requirements for heavy-duty load bearing particleboard for use in dry conditions
(P-HLB REG) .6
5.4 Requirements for general purpose particleboard for use in humid conditions (P-GP MR) .6
5.5 Requirements for furniture type particleboard for use in humid conditions (P-FN MR) .7
5.6 Requirements for load bearing particleboard for use in humid conditions (P-LB MR) .8
5.7 Requirements for heavy-duty load bearing particleboard for use in humid conditions
(P-HLB MR).9
5.8 Requirements for general purpose particleboard for use in high humid conditions
(P-GP HMR) .10
5.9 Requirements for furniture type particleboard for use in high humid conditions
(P-FN HMR).11
5.10 Requirements for load bearing particleboard for use in high humid conditions
(P-LB HMR).12
5.11 Requirements for heavy-duty load bearing particleboard for use in high humid conditions
(P-HLB HMR) .13
6 Marking.13
Annex A (normative) Calculation of 5-percentile and 95-percentile values .14

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ISO 16893-2:2010(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 16893-2 was prepared by Technical Committee ISO/TC 89, Wood-based panels, Subcommittee SC 2,
Particle boards.
ISO 16893 consists of the following parts, under the general title Wood-based panels — Particleboard:
⎯ Part 1: Classifications
⎯ Part 2: Requirements

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INTERNATIONAL STANDARD ISO 16893-2:2010(E)

Wood-based panels — Particleboard —
Part 2:
Requirements
1 Scope
This part of ISO 16893 provides the manufacturing property requirements for uncoated particleboard.
The values listed in this part of ISO 16893 relate to product properties used to classify particleboards into one
of four types, P-GP, P-FN, P-LB or P-HLB (see Clause 3), for use in three service conditions, REG, MR and
HMR. 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 16893-1, Wood-based panels — Particleboard — 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 16893-2:2010(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 16893-1 and the
following abbreviations apply.
EXT exterior
FN furniture
GP general purpose
HLB heavy-duty load bearing
HMR highly moisture resistant
LB load bearing
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 Table 2, ISO 16893-1, be applied to samples of the group. Conditioning of test
specimens is required as specified in each test method; and
b) The results of the tests be evaluated against the appropriate specification limits in Tables 1 to 14,
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 14 are based on 5 (lower) or 95 (upper) percentile expressions, according to
4.2 and 4.3.
Particleboard shall comply with the relevant requirements of this International Standard when despatched
from the producing factory.
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ISO 16893-2:2010(E)
4.2 Lower specification limits
The requirements in Tables 3 to 14 are the lower specification limits for the following properties:
a) bending strength (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 14.
4.3 Upper specification limits
The requirements in Tables 3 to 14 are the upper specification limits for the following properties:
a) thickness swell after 24 h; and
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 14.
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 7 to 14
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 particleboards subjected to a cyclic accelerated ageing test,
followed by the determination of thickness swell and internal bond strength, as described in ISO 16987.
⎯ Option 2:   Requirements apply to those particleboards subjected to an accelerated ageing test,
consisting of immersion in boiling water followed by determination of internal bond strength, as described
in ISO 16998.
⎯ Option 3:   Requirements apply to those particleboards subjected to an accelerated ageing test
consisting of immersion in water at 70 °C followed by determination of the wet bending strength (MOR) as
described in Method A of ISO 20585.
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ISO 16893-2:2010(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.
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
u 12 > 12
−0,3 −0,5
 — Unsanded board
+1,5 +1,7
 — Sanded board ±0,3 ±0,3
Moisture content (advisory only) ISO 16979 5 to 13 %

4.6 Formaldehyde requirements
Compliance with formaldehyde requirements may be confirmed by applying only one test method 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 may 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 particleboard
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
refere
...