ISO 10033-1:2011

INTERNATIONAL ISO
STANDARD 10033-1
First edition
2011-04-15

Laminated Veneer Lumber (LVL) —
Bonding quality —
Part 1:
Test methods
Lamibois — Qualité du collage —
Partie 1: Méthodes d'essai




Reference number
ISO 10033-1:2011(E)
©
ISO 2011

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ISO 10033-1:2011(E)

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©  ISO 2011
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ii © ISO 2011 – All rights reserved

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ISO 10033-1:2011(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Test pieces .1
3.1 Sampling .1
3.2 Shape and size.1
4 Apparatus.2
5 Pre-treatment .2
5.1 Sequence of pre-treatment.2
6 Procedure.3
6.1 Test piece preparation .3
6.2 Measurement of delamination.3
6.3 Alternative procedures .4
7 Expression of results.4
8 Test report.4
Annex A (normative) Bond testing and evaluation using the shear testing procedures (suitable
for internal production control) .5
Annex B (normative) Bond testing and evaluation using the chisel/knife testing procedures
(suitable for internal production control).14

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ISO 10033-1:2011(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 10033-1 was prepared by Technical Committee ISO/TC 89, Wood-based panels, Subcommittee SC 3,
Plywood.
ISO 10033 consists of the following parts, under the general title Laminated Veneer Lumber (LVL) — Bonding
quality:
⎯ Part 1: Test methods
⎯ Part 2: Requirements

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INTERNATIONAL STANDARD ISO 10033-1:2011(E)

Laminated Veneer Lumber (LVL) — Bonding quality —
Part 1:
Test methods
1 Scope
This part of ISO 10033 specifies test methods for determining the bonding quality of Laminated Veneer
Lumber (LVL) bonded with thermosetting resin.
NOTE If it is possible to demonstrate a correlation between the methods defined in this part of ISO 10033 and other
methods, those methods can be used.
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 10033-2, Laminated Veneer Lumber (LVL) — Bonding quality — Part 2: Requirements
ISO 12466-1, Plywood — Bonding quality — Part 1: Test methods
ISO 12466-2, Plywood — Bonding quality — Part 2: Requirements
ISO 16999, Wood-based panels — Sampling and cutting of test pieces
3 Test pieces
3.1 Sampling
Sampling shall be in accordance with ISO 16999.
The test pieces shall be without any visible defect in the testing area.
3.2 Shape and size
Each test piece shall be a (75 ± 1) mm × (75 ± 1) mm square and the full thickness of the LVL as shown in
Figure 1. If the LVL sample is less than 75 mm across the end section, the test specimen shall have the actual
width of the sample and a length of 75 mm. Permitted imperfection may be included in the test pieces.
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ISO 10033-1:2011(E)

Key
t thickness
L length
w width
G grain direction
Figure 1 — Test piece — Shape and size
4 Apparatus
4.1 Temperature-controlled water bath, suitable for immersing test pieces and capable of maintaining a
minimum temperature of 17 °C, and/or (70 ± 3) °C.
NOTE Temperature capability depends on employed pre-treatment cycle(s).
4.2 Boiling tank, enabling test pieces to be immersed in boiling water.
4.3 Ventilated drying oven, capable of maintaining a temperature of (60 ± 3) °C and/or (70 ± 3) °C at all
points.
NOTE Temperature capability depends on bonding class.
4.4 Vacuum pressure chamber, capable of maintaining in water at room temperature a vacuum of 85 kPa
for 30 min followed immediately by application of pressure of (465 ± 15) kPa for 30 min.
4.5 Autoclave, capable of maintaining steam pressure at (200 ± 7) kPa for 6 h ± 15 min.
5 Pre-treatment
5.1 Sequence of pre-treatment
The choice of pre-treatment, described in 5.1.1 to 5.1.7 for particular LVL bonding classes, shall be made in
accordance with ISO 10033-2.
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ISO 10033-1:2011(E)
5.1.1 24 h cold soak: immersion for 24 h in water at a temperature not lower than 17 °C.
NOTE (20 ± 3) °C can be considered as a test reference temperature.
5.1.2 6 h boil: immersion for 6 h in boiling water, followed by cooling in water at less than 30 °C for at least
1 h.
5.1.3 BDB (boil-dry-boil): immersion for 4 h in boiling water, then drying in the ventilated drying oven for
16 h to 20 h at (60 ± 3) °C, then immersion in boiling water for 4 h, followed by cooling in water at less than
30 °C for at least 1 h.
5.1.4 VP (vacuum pressure): test specimens are immersed in water at room temperature and a vacuum of
85 kPa is applied for 30 min followed by the immediate application of a pressure of (465 ± 15) kPa for 30 min.
5.1.5 72 h boil: immersion for (72 ± 1) h in boiling water, followed by cooling in water at less than 30 °C for
at least 1 h.
5.1.6 Steam: specimens are placed in steam at (200 ± 7) kPa pressure for 6 h ± 15 min followed by cooling
for at least 1 h in water at less than 30 °C.
5.1.7 Hot water soak: immersion in water at (70 ± 3) °C for 2 h. This test is not applicable to Annex A or B.
6 Procedure
6.1 Test piece preparation
After the pre-treatment, test pieces shall be processed as follows:
⎯ bonding class 1: after the pre-treatment, test pieces shall be dried at a temperature of (60 ± 3) °C for 24 h,
prior to evaluation;
⎯ bonding class 2: after the pre-treatment, test pieces shall be dried at a temperature of (70 ± 3) °C for 24 h,
prior to evaluation;
⎯ bonding class 3: the pre-treatment shall be carried out twice. Test pieces shall be dried after each cycle of
pre-treatment at (70 ± 3) °C for 24 h, prior to evaluation.
6.2 Measurement of delamination
The length of delamination in each glueline on the four sides of the test piece shall be measured.
Delamination of a length less than 3 mm shall be ignored. The ratio of the delamination in each single glueline
to the total length of the glueline on four sides shall be determined as a percentage. The ratio of the total
length of delamination on the four sides to the total length of all gluelines on four sides shall also be calculated
as a percentage.
The ratio of delamination shall be calculated by the following equations:
Ratio of delamination (%)
l × 100
d,single
r = (1)
single
l
g,single
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ISO 10033-1:2011(E)
where
l is the total length of delamination in a single glueline on four sides;
d,single
l is the total length of a single glueline on four sides;
g,single
l × 100
d,total
r = (2)
total
l
g,total
where
l is the total length of delamination in all gluelines on four sides;
d,total
l is the total length of all gluelines on four sides.
g,total
6.3 Alternative procedures
Alternative procedures for bond testing and evaluation, the lap shear test and the knife or chisel test are
provided in Annexes A and B. These procedures are deemed suitable for quality control purposes.
7 Expression of results
The results shall be expressed as two ratios in percentages:
1) ratio of delamination (%) in any single glueline,
2) ratio of delamination (%) in total length of all gluelines.
8 Test report
The test report shall be in accordance with ISO 16999 and shall also contain the following information:
a) ratio of delamination (%) in any single glueline;
b) ratio of delamination (%) in total length of all gluelines;
c) details of pre-treatment (see 5.1);
d) reference to this part of ISO 10033.

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ISO 10033-1:2011(E)
Annex A
(normative)

Bond testing and evaluation using the shear testing procedures
(suitable for internal production control)
A.1 General
For the evaluation of the bonding quality of LVL, apply ISO 12466-1 with the following modifications.
Depending on the lay-up and the position of the layers, the shear load shall be applied to the glueline by
tension or compression of test pieces.
A.2 Test pieces
A.2.1 Preparation of test pieces
A.2.1.1 General
The making of the test pieces may require the removal of the material not to be tested and, in some cases, to
bond a wood or plywood plate on the face(s) of the remaining material. It depends on:
⎯ the number of plies in a layer: one or two plies in one direction and more than two plies in one direction;
⎯ the position of the layer in the lay-up.
A.2.1.2 Layers with one or two plies in one direction
A.2.1.2.1 General
The test piece design is such that the tension load is applied across the grain of the layer to be tested.
A.2.1.2.2 Face layer (Figure A.1)
Cut a sample of a set of test pieces in such a way so that the length of a piece shall be across the grain of the
face layer.
Keep the face layers and those underneath up to 15 mm and machine off the rest.
Cut a plate of 15 mm LVL made of the same species.
Bond this plate on the face layer of the LVL sample (the grain of the latter being at right angles to the grain of
the face of the plate).
This glueline shall be compatible with the pre-treatment and the shear force applied to control the resistance
of the glueline of the LVL to be tested.
On the LVL face, make a saw cut through it so that it reaches into the LVL face layer of the sample.
On the cleared face of the test sample, make a saw cut through the opposite layers so it reaches into the LVL
face layer of the sample.
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ISO 10033-1:2011(E)
Cut the individual test pieces out of the sample.
The dimensions in the plane of the test pieces are the following:
⎯ distance between the closer edges of the saw cuts: (25 ± 0,5) mm;
⎯ width of the test piece: (25 ± 0,5) mm.
Total length of the test piece shall be consistent with:
⎯ a shear area dimension along the load direction of 25 mm;
⎯ a clearance of 50 mm, at least, between the clamps;
⎯ the necessary length for its gripping.
Prior to pre-treatment, condition the test pieces in the standard climate (20 ± 2) °C and (65 ± 5) % RH so as to
achieve the curing of the bond of the plates and the equilibrium of the moisture content.
Cohesive wood fibre failure (or wood fibre adhesion) shall be evaluated only on the glueline between the face
layer and across the layer below.
NOTE The evaluation of the wood fibre adhesion of the glueline bonding the 15 mm LVL plate is not relevant.
A.2.1.2.3 Core layers (Figure A.1)
Considering the pair of gluelines to be tested, keep one or more layers on both sides of the layer in-between
and machine off excess material on both sides; the test piece shall be nominally symmetrical.
Make a saw cut so as to reach into the layer between the two gluelines to be tested.
A.2.1.3 Layers with more than two plies
A.2.1.3.1 General
The shear strength is evaluated by applying a load along the direction of the grain of the layers to be tested.
Two options are available:
⎯ testing gluelines per pair;
⎯ testing gluelines per sets of more than two.

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ISO 10033-1:2011(E)
Dimensions in millimetres

Key
a
Remove these layers.
b
Add these layers.
c
Glueline to be tested.
d
Layer (one or tw
...