BS 14322:2021 pdf download – Wood-based panels — Melamine faced boards for interior uses — Definition, requirements and classification
This document specifies the surface requirements and dimensional tolerances for decorative melamine faced boards for interior use which are common for particleboards, extruded particleboards fibreboards and sandwich boards for furniture.
This document is not applicable to boards laminated with so called priming foils or finish foils and laminates according to EN 438-1 and EN 438-2.
This document is not applicable to laminate floor coverings.
Melamine faced wood-based boards in accordance with this document can be referred to as MFB.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 311, Wood-based panels – Surface soundness – Test method
EN 320, Particleboards and fibreboards – Determination of resistance to axial withdrawal of screws
EN 717-1, Wood-based panels – Determination of formaldehyde release – Part 1: Formaldehyde emission by the chamber method
EN 14323:2021, Wood-based panels – Melamine faced boards for interior uses – Test methods
EN ISO 11664-6, Colorimetry – Part 6: CIEDE2000 Colour-difference formula (ISO/CIE 11664-6)
EN ISO 12460-3, Wood-based panels – Determination of formaldehyde release – Part 3: Gas analysis method (ISO 12460-3)
ISO 13655, Graphic technology – Spectral measurement and colorimetric computation for graphic arts images
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
melamine faced board
board manufactured by directly applying uncured aminoplastic resin impregnated papers to one or both faces of board substrates and achieving bonding and curing in the same process using heat and pressure but without the use of an intermediate adhesive Note 1 to entry: The resin of the surface layer is an aminoplastic resin (mainly melamine resin).
Note 2 to entry: The board surfaces can be smooth or structured on one or both faces and the outer surfaces having decorative colours or design.
Melamine faced boards shall comply with the general requirements as listed in Table 1 when dispatched from the producing factory. Supplementary properties are given in Annex A (normative).
5.1 Colour comparison Where colour comparison is required by the purchaser this can be checked by visual assessment (light box) or by assessment using spectral measurement technology. Spectral measurement may be either spatially resolved or spectral measurement according to ISO 13655. The tests are carried out in accordance with EN 14323. For visual assessment there shall be only slight deviation (rating 4) between the reference sample and test piece under examination when inspected according to the test method given in EN 14323. For mother of pearl and metallic finishes a rating 3 is permitted.
When assessing decorative surfaces using spectral measurement technology, a similarity index indicates the percentage of the test piece’s conformity with the reference sample. The similarity indices according to EN 14323:2021, 6.8.3 and 6.8.4 are based on measured colour distances in accordance with EN ISO 11664-6 and calculated according to the procedure given in EN 14323:2021, Annex B and Annex C. The indices are decor-dependent. When unicolours and white are assessed using measurement technology a colour difference in accordance with EN ISO 11664-6 indicates the deviation of the test piece from the reference sample. Acceptance criteria regarding similarity are to be agreed between supplier and customer. Since slight variations in colour will occur due to inherent variation in the surfacing papers and the core board, it is recommended that boards or panels to be used side by side should be selected from the same production batch where possible and matched to ensure colour compatibility before fabrication or installation.
5.2 Surface texture Where matching of surface texture is required by purchaser there shall be only slight deviation (rating 4) between the reference sample and test piece under examination when inspected according to test method given in EN 14323.BS 14322 pdf download.