EN 314-1:2004

Plywood - Bonding quality - Part 1: Test methods

This document specifies methods for determining the bonding quality of veneer plywood, blockboard and laminboard by shear testing.
The relevant requirements are specified in EN 314 2.
This document is suitable for insulating core plywood as defined in Annex B.
Annex A is normative. Annex B is informative.

Sperrholz - Qualität der Verklebung - Teil 1: Prüfverfahren

Diese Europäische Norm legt Verfahren zur Bestimmung der Qualität der Verklebung von Furniersperrholz sowie
von Stab- und Stäbchensperrholz mit Hilfe einer Scherprüfung fest.
Die entsprechenden Anforderungen sind in EN 314-2 festgelegt.
Diese Europäische Norm ist anwendbar für Mittellagen-Sperrholz für Dämmzwecke nach Anhang B.
Anhang A ist normativ. Anhang B ist informativ.

Contreplaqué - Qualité du collage - Partie 1: Méthodes d'essai

La présente Norme européenne prescrit les méthodes pour la détermination de la qualité du collage du contreplaqué à plis, du latté et du lamellé par un essai de cisaillement.
Les exigences appropriées sont celles prescrites dans EN 314-2.
La présente Norme européenne est adaptée au contreplaqué à âme isolante tel que défini dans l'Annexe B.
L'Annexe A est normative. L'Annexe B est informative.

Vezane plošče - Kakovost zlepljenosti - 1. del: Preskusne metode

General Information

• Status: Published
• Publication Date: 21-Dec-2004
• Withdrawal Date: 29-Jun-2005
• ICS: 79.060.10 - Plywood
• Technical Committee: CEN/TC 112 - Woodbased panels
• Drafting Committee: CEN/TC 112 - Woodbased panels
• Current Stage: 9060 - Closure of 2 Year Review Enquiry - Review Enquiry
• Start Date: 02-Dec-2025
• Completion Date: 02-Dec-2025
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Ref Project: SIST EN 314-1:2005 - Plywood - Bonding quality - Part 1: Test methods

Relations

• Replaces: EN 314-1:1993 - Plywood - Bonding quality - Part 1: Test methods
• Effective Date: 22-Dec-2008

Overview

EN 314-1:2004 (CEN) specifies standardized test methods for assessing bonding quality of plywood. It covers veneer plywood, blockboard and laminboard, and is applicable to insulating core plywood (see informative Annex B). The document defines sampling, test-piece geometry, pre‑treatments, test apparatus, shear test procedure, result expression and reporting. Requirements against which results are judged are given in EN 314-2.

Key topics

• Scope and applicability
  • Shear-testing methods for bonding quality of veneer plywood, blockboard and laminboard.
  • Suitable for insulating core plywood following Annex B guidance.
• Sampling and test pieces
  • Sampling per EN 326-1; test pieces must be free of manufacturing defects in the test area.
  • Typical shear test piece dimensions: shear width b = 25 ± 0.5 mm, shear length l = 25 ± 0.5 mm; saw-cut widths 2.5–4 mm. Composite geometries for blockboard/laminboard and thin-face plywood are specified.
• Apparatus
  • Thermostatically controlled water bath (20 ± 3 °C), boiling tank, ventilated drying oven (60 ± 3 °C), precision measuring devices and a tensile testing machine with serrated grips (±1 % accuracy).
• Pre-treatments
  • Defined sequences for water and heat exposure prior to testing (examples include 24 h immersion at 20 °C, 6 h boiling + cooling, or more severe boiling/drying cycles).
  • Choice of pre-treatment depends on plywood type and is referenced to EN 314-2.
• Shear test procedure and calculation
  • Tests performed on wet test pieces; loading rate set so rupture occurs within (30 ± 10) s.
  • Shear strength f = F / (l1 × b1) expressed in N/mm² (F = failing force, l1 & b1 measured before pre-treatment).
• Evaluation of failure
  • Apparent cohesive wood failure (%) is determined after drying using normative Annex A illustrations and guidance (recorded to nearest 5–10 %; texture and area assessed).
• Annex B (informative)
  • Guidelines for evaluating glue bond of insulating core plywood; bond expressed as ratio of mean strengths between conditioned and pre-treated sets.

Applications and users

• Manufacturers of plywood, blockboard and laminboard for quality control and product development.
• Independent testing laboratories and certification bodies performing glue-bond evaluations and compliance testing.
• Specifiers, architects and engineers requiring documented bonding performance for structural or exposed applications.
• Suppliers of insulating core plywood using Annex B procedures to assess core-to-face bonding.

Related standards

• EN 314-2 - Plywood: Bonding quality - Part 2: Requirements (defines acceptance criteria and pre-treatment selection).
• EN 326-1 - Sampling and cutting of test pieces and expression of test results.
• EN 319 (referenced for internal bond of core materials in Annex B).

Keywords: EN 314-1:2004, plywood bonding quality, shear testing, veneer plywood, blockboard, laminboard, insulating core plywood, CEN standard, glue bond test.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2005
1DGRPHãþD
SIST EN 314-1:1996
9H]DQHSORãþH.DNRYRVW]OHSOMHQRVWLGHO3UHVNXVQHPHWRGH
Plywood - Bonding quality - Part 1: Test methods
Sperrholz - Qualität der Verklebung - Teil 1: Prüfverfahren
Contreplaqué - Qualité du collage - Partie 1: Méthodes d'essai
Ta slovenski standard je istoveten z: EN 314-1:2004
ICS:
79.060.10 Vezan les Plywood
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 314-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2004
ICS 79.060.10 Supersedes EN 314-1:1993
English version
Plywood - Bonding quality - Part 1: Test methods
Contreplaqué - Qualité du collage - Partie 1: Méthodes Sperrholz - Qualität der Verklebung - Teil 1: Prüfverfahren
d'essai
This European Standard was approved by CEN on 14 October 2004.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 314-1:2004: E
worldwide for CEN national Members.

Contents
page
Foreword.3
1 Scope .4
2 Normative references .4
3 Test pieces .4
3.1 Sampling.4
3.2 Shape and sizes.4
4 Apparatus .8
4.1 Physical test.8
4.2 Shear test.8
5 Pre-treatments.8
5.1 Sequence of pre-treatment .8
5.2 Choice of pre-treatment .8
5.3 Positioning of test pieces .8
6 Procedure .9
6.1 Determination of behaviour of bonding by shear test.9
6.2 Determination of the percentage of apparent cohesive wood failure.9
7 Expression of results .9
8 Test report .10
Annex A (normative)  Determination of the percentage of apparent cohesive wood failure by
comparison.11
Annex B (informative)  Guidelines for the evaluation of glue bond of insulating core plywood .14
Bibliography .20

Foreword
This document (EN 314-1:2004) has been prepared by Technical Committee CEN/TC 112 “Wood based
panels”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2005, and conflicting national standards shall be withdrawn at
the latest by June 2005.
This document supersedes EN 314-1:1993.
In the revised version the following modifications have been made as compared to EN 314-1:1993:
— the standard contains not only test methods for veneer plywood but also for blockboard and laminboard;
— the normative annex A "Determination of the percentage of apparent cohesive wood failure by
comparison" has been extended;
— a new informative annex B "Guidelines for the evaluation of glue bond of insulating core plywood" has
been added.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
1 Scope
This document specifies methods for determining the bonding quality of veneer plywood, blockboard and
laminboard by shear testing.
The relevant requirements are specified in EN 314-2.
This document is suitable for insulating core plywood as defined in Annex B.
Annex A is normative. Annex B is informative.
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.
EN 314-2, Plywood — Bonding quality — Part 2: Requirements
EN 326-1, Wood-based panels — Sampling, cutting and inspection — Part 1: Sampling and cutting of test
pieces and expression of test results.
3 Test pieces
3.1 Sampling
Sampling shall be according to EN 326-1.
Test pieces shall be without any manufacturing defects or characteristics inherent in wood (see EN 635-1) in
the testing area.
3.2 Shape and sizes
The test pieces of veneer plywood shall be prepared as shown in Figure 1.
Each test piece shall be cut so that the grain direction of the layer between the gluelines under test is
perpendicular to the length of the test piece.
The test pieces have to be prepared and the nicking is made to allow the examination of each glueline of the
panel.
The saw cuts shall extend into the layer between the gluelines under test, as shown in Figure 1.
Full panel thickness test pieces may be used for veneer plywood with 3 to 9 layers.
For panels of more than 9 layers, excess layers may be removed by planing, cutting or sanding.
Similar procedure can be used for determining the bonding quality of blockboard and laminboard (Figure 2) or
thin faces veneered plywood (Figure 3). The saw cuts shall extend into one of the layers between the
gluelines under test between face layers and core layers, as shown in Figures 2 and 3.
NOTE For insulating core plywood, see Annex B.
Key
b (25 ± 0,5) mm (shear width of test piece)
b 2,5 mm to 4 mm (saw cut width)
l (25 ± 0,5) mm (shear length)
l 50 mm min (distance between clamps)
along the grain direction
Figure 1 — Test piece example for a 7 ply veneer plywood
Key
1 Face
2 Back face
3 Part 1
4 Part 2
5 Faces of part 1 and part 2, the same set-up shall be made for the back face of part 1 and part 2
6 Glueline not subject to the shear test
7 Saw cuts throughout the face layers
b (25 ± 0,5) mm (shear width)
b (2,5 to 4) mm (saw cut width)
l (25 ± 0,5) mm (shear length)
l 50 mm min (distance between clamps)
along the grain direction
Figure 2 — Composite test piece for blockboard and laminboard
Key
1 Face
2 Back face
3 Part 1
4 Part 2
5 Faces of part 1 and part 2, the same set-up shall be made for the back face of part 1 and part 2
6 Glueline not subject to the shear test
b (25 ± 0,5) mm (shear width)
b (2,5 to 4) mm (saw cut width)
l (25 ± 0,5) mm (shear length)
l 50 mm min (distance between clamps)
along the grain direction
Figure 3 — Composite test piece for thin face plywood panel
4 Apparatus
4.1 Physical test
 Thermostatically controlled water-bath suitable for immersing test pieces and capable of maintaining a
temperature of (20 ± 3) °C.
 Boiling tank enabling the test piece to be immersed in boiling water.
 Ventilated drying oven capable of maintaining a temperature of (60 ± 3) °C at all points.
 Measuring instrument of lengths with an accuracy of 0,1 mm.
 A lens with a magnification of 10.
4.2 Shear test
A tensile testing machine with suitable serrated grips capable of operating continuously and measuring the
applied load to an accuracy of ± 1 %.
5 Pre-treatments
5.1 Sequence of pre-treatment
5.1.1 Immersion for 24 h in water at (20 ± 3) °C.
5.1.2 Immersion for 6 h in boiling water followed by cooling in water at (20 ± 3) °C, for at least 1 h.
5.1.3 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 wa
...