BS EN 622-4-2009 pdf download.Fibreboards Specifications Part 4 : Requirements for softboard.
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 310, Wood-based panels — Determination of modulus of elasticity in bending and of bending strength
EN 316, Wood fibre boards — Definition, classification and symbols
EN 317, Particleboards and fibreboards — Determination of swelling in thickness after immersion in water
EN 326-1. Wood-based panels — Sampling, cutting and inspection — Part 1: Sampling and cutting of test pieces and expression of test results
EN 326-2. Wood-based panels — Sampling, cutting and Inspection — Part 2: Quality control in the factory
EN 326-3. Wood-based panels — Sampling, cutting and inspection — Part 3: Inspection of an isolated lot of panels
EN 622-1, Fibreboards — Specifications — Part 1: General requirements
EN 13986:2004, Wood-based panels for use in construction — Characteristics, evaluation of conformity and marking
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13986:2004 and the following apply.
3.1
dry conditions
conditions corresponding to service class 1 of EN 1995-1-1 which is characterised by a moisture content in the material corresponding to a temperature of 20 C and a relative humidity of the surrounding air only exceeding 65 % for a few weeks per year
NOTE Boards of this type are suitable for use only In hazard dass 1 of EN 335-3.
3.2
humid conditions
conditions corresponding to service class 2 of EN 1995-1-1 which is characterised by a moisture content in the material corresponding to a temperature of 20 °C and a relative humidity of the surrounding air only exceeding 85 % for a few weeks per year
NOTE Boards of this type are suitable for use only in hazard classes 1 and 2 of EN 335-3.
3.3
external conditions
conditions corresponding to service class 3 of EN 1995-1-1 which is charactensed by climatic conditions leading to higher moisture contents than in service class 2
NOTE Boards of this type are suitable for use only in hazard classes 1, 2 and 3 of EN 335-3.
3.4
general purpose use
all non-load-bearing applicabons
NOTE e. g. fitments and underlays.
3.5
loading-bearing use
use in a load-bearing construction, i.e. an organized assembly of connected parts designed to provide mechanical resistance and stability to the works.
NOTE Also referred to as structure.
3.6
load duration class
class characterised by the effect of a constant load acting for a certain period of time in the life of the structure
NOTE The load duration classes are defined Ni EN 1995-1-1 (see Table 1).
4 Requirements
4.1 General
Softboards shall comply with the general requirements of EN 622-1 together with the relevant requirements set out in 4.2 and 4.3 of this standard.
The requirements in the tables shall be met be 5 percentile values (95 percentile values in the case of swelling In thickness), based on the mean test values for individual panels and calculated in accordance with EN 326-1. In the case of swelling in thickness, they shall be equal to or less than the values in the tables, and in the case of all other properties, they shall be equal to or greater than the values in the tables. The values in the tables for both bending strength and modulus of elasticity shall apply to test results obtained in any direction in the plane of the panel.
With the exception of swelling in thickness, the values given in the tables are characterised by a moisture content in the material corresponding to a temperature of 20 °C and a relative humidity of 65 %. The values given foi- swelling in thickness are characterised by a moisture content in the material corresponding to a temperature of 20 °C and a relative humidity of 65 % before the treatment (immersion in water).
The moisture resistance of softboards for use in humid and external conditions (see Tables 3. 4 and 6) Is reflected by the respective requirements for swelling in thickness after 2 h immersion in cold water (according to EN 317). This property as well as the improvement of mechanical resistance of boards use in instantaneous or short-term load-bearing situation is derived from the addition of a hydrophobic substance such as a petrochemical or a natural substance.
4.2 Requirements for general purpose boards
4.2.1 Requirements for boards for use in dry conditions
Table 2 specifies the requirements foi general purpose boards for use in dry conditions.BS EN 622-4-2009 pdf download.