SIST EN 325:2026

Wood-based panels - Determination of dimensions of test pieces

This document specifies a method for measuring the thickness, length and width of test pieces of wood-based panels.

Holzwerkstoffe - Bestimmung der Maße der Prüfkörper

Dieses Dokument legt ein Verfahren zur Messung der Dicke, Länge und Breite von Prüfkörpern aus Holzwerkstoffen fest.

Panneaux à base de bois - Détermination des dimensions des éprouvettes

Le present document définit prescrit une méthode pour mesurer l'épaisseur, la longueur et la largeur d'éprouvettes provenant de panneaux à base de bois.

Lesne plošče - Ugotavljanje mer preskušancev

General Information

• Status: Published
• Public Enquiry End Date: 30-Jan-2025
• Publication Date: 17-Nov-2025
• ICS: 79.060.01 - Wood-based panels in general
• Technical Committee: LLZ - Les, lesni izdelki in zaščita lesa
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 14-Nov-2025
• Due Date: 19-Jan-2026
• Completion Date: 18-Nov-2025
• Ref Project: EN 325:2025 - Wood-based panels - Determination of dimensions of test pieces

Relations

• Revises: SIST EN 325:2012 - Wood-based panels - Determination of dimensions of test pieces
• Effective Date: 07-Aug-2024

Overview

SIST EN 325:2026, developed by CEN, is the European standard that defines the precise method for determining the dimensions of test pieces from wood-based panels. This standard replaces the earlier version EN 325:2012 and establishes updated procedures for accurately measuring thickness, length, and width of test samples. It is essential for manufacturers, quality control laboratories, and testing institutions working with wood-based panels to ensure consistent and reliable dimension measurements. SIST EN 325:2026 supports harmonization in testing across European countries, ensuring compliance and comparability of results.

Key Topics

• Scope and Purpose
  The standard specifies measurement techniques to determine the thickness, length, and width of cut test pieces derived from wood-based panel materials. This contributes to standardized evaluation of panel characteristics and quality.

• Measurement Instruments

  • Thickness Measurement: Use of a micrometer or equivalent instrument with flat, parallel measuring surfaces (15–20 mm diameter) and an operation force of (4 ± 1) N. Precision must allow readings to 0.01 mm.
  • Length and Width Measurement: Use of a sliding caliper or similar device with measuring surfaces at least 3 mm wide, calibrated for readings to 0.1 mm.

• Sampling and Cutting
  Samples for testing must be prepared according to the relevant test standards or EN 326-1, which deals with sampling and cutting protocols for wood-based panels, ensuring representative and standardized test pieces.

• Conditioning Requirements
  Test pieces need conditioning to a constant mass in controlled climate conditions: relative humidity of (65 ± 5)% and temperature (20 ± 2)°C. Constant mass is achieved when two 24-hour-interval weighings differ by no more than 0.1% of sample mass. This ensures dimensional stability before measurements.

• Measurement Procedure

  • Thickness: Measured by slowly applying the micrometer’s flattened measuring surfaces to avoid compression errors, with precision to two decimals (0.01 mm).
  • Length and Width: Measured with the sliding caliper applied at approximately a 45° angle to the test piece surface, avoiding excessive pressure and ensuring repeatability, with a precision of 0.1 mm.

• Test Reporting
  Reporting conventions and documentation follow EN 326-1, ensuring uniform reporting across laboratories and industry.

Applications

SIST EN 325:2026 is fundamental in the wood-based panel industry for quality control, research, and certification processes. Accurate dimension determination allows:

• Verification of compliance with product specifications and design tolerances.
• Assessment of physical properties related to panel thickness and surface dimensions.
• Support for mechanical testing by ensuring consistent sample sizes.
• Facilitation of international trade by adhering to harmonized European norms.
• Reliable data input for R&D focused on wood panel development and performance optimization.

Quality assurance teams and testing laboratories utilize SIST EN 325:2026 to maintain consistency in material evaluation, critical for timber flooring, furniture manufacturing, construction components, and engineered wood products.

Related Standards

• EN 326-1: Sampling, Cutting, and Inspection of Test Pieces
  This standard governs the sampling and cutting procedures aligned with SIST EN 325:2026 requirements, ensuring representative specimens for testing dimension measurements.

• ISO 9424:2003 - Wood-based Panels - Determination of Dimensions of Test Pieces
  Provides complementary international guidance on test piece dimension measurements supporting global standardization efforts.

• Other Wood-based Panel Test Standards
  Numerous product-specific European and international standards reference SIST EN 325:2026 for the preliminary step of dimension measurement before performing mechanical, physical, or chemical testing.

By integrating SIST EN 325:2026 in wood panel testing protocols, stakeholders benefit from improved accuracy, reproducibility, and mutual recognition of test results across European and international markets.

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Keywords: SIST EN 325:2026, wood-based panels, test piece dimensions, thickness measurement, length and width measurement, CEN standard, panel sampling, wood panel testing, quality control, European standard for wood products.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2026
Lesne plošče - Ugotavljanje mer preskušancev
Wood-based panels - Determination of dimensions of test pieces
Holzwerkstoffe - Bestimmung der Maße der Prüfkörper
Panneaux à base de bois - Détermination des dimensions des éprouvettes
Ta slovenski standard je istoveten z: EN 325:2025
ICS:
79.060.01 Lesne plošče na splošno Wood-based panels in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 325
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2025
EUROPÄISCHE NORM
ICS 79.060.01 Supersedes EN 325:2012
English Version
Wood-based panels - Determination of dimensions of test
pieces
Panneaux à base de bois - Détermination des Holzwerkstoffe - Bestimmung der Maße der
dimensions des éprouvettes Prüfkörper
This European Standard was approved by CEN on 6 July 2025.

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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 325:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principles . 4
5 Apparatus . 4
5.1 Instrument for thickness measurement . 4
5.2 Instrument for length and width measurement . 4
6 Test pieces . 4
6.1 Sampling and cutting . 4
6.2 Dimensions. 4
6.3 Conditioning . 5
7 Procedure . 5
7.1 Measuring points . 5
7.2 Thickness measurement . 5
7.3 Length and width measurement . 5
8 Test report .
...