EN 438-9-2017 pdf download.High-pressure decorative laminates (l-IPL) – Sheets based on thermosetting resins (usually called laminates) – Part 9: Classification and specifications for alternative core laminates.
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 438-2:2016, High-pressure decorative laminates (HPL) – Sheets based on thermosetting resins (usually called laminates) – Part 2: Determination of pro perties
EN 12721 • Furniture — Assessment of surface resistance to wet heat
EN ISO 178, Plastics – Determination offlexural properties (ISO 178)
EN ISO 1183-1, Plastics – Methods for determining the density of non-cellular plastics – Part 1: Immersion method, liquid pyknometer method and titration method (ISO 1183-i)
EN ISO 12572, Hygrothermal performance of building materials and products – Determination of water vapour transmission properties – Cup method (ISO 12572)
EN ISO 11664-2, Colorimetiy – Part 2: CIE standard illuminants (iSO 11664-2)
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
high-pressure decorative alternative core laminate(s) alternative core laminate(s)
HPL
sheet(s) consisting of decorative surface layer(s) and alternative core layers bonded together by an high pressure process
Note ito entry: Typical values for the high pressure process are a temperature oft 120 °C and a pressure ofSMPa.
3.1.2
surface layer
upper decorative layer consisting in one or more sheets of fibrous material (usually paper) impregnated with aminoplastic thermosetting resins (usually melamine based resins)
Note I to entry: The surface layers appear on one or both side(s) of the laminate(s). In case of one-sided laminates, the back of the sheet(s) can be made suitable for adhesive bonding to a substrate.
3.1.3
alternative core layer
3.1.3.1
coloured core layer
coloured fibrous materials (usually paper) impregnated with aminoplastic thermosetting resins (usually melamine based resins) or fibrous materials (usually paper) impregnated with coloured aminoplastic thermosetting resins (usually melamine based resins)
Note 1 to entry: A translucent laminate Is achieved by using clear resins and bleached fibres.
Note 2 to entry: The surface layer and the coloured core layers can have the same colour producing a uniformly
coloured laminate or be different colours to achieve a succession of coloured layers.
3.1.3.2
metal reinforced core layer
metal layer(s) or mesh(es) and cellulosic fibrous layers (usually paper) impregnated with phenolic thermosetting resins or aminoplastic thermosetting resins (usually melamine based resins)
Note I to entry: The purpose of including the metal layers is to improve the mechanical, fire or permeability performances of the laminate. Additionally the metal layers can give aesthetic improvements to edge.
3.2 Symbols
For the purposes of this document, the following symbol applies.
t nominal thickness of the alternative core laminate
4 Material types and classification system
Alternative core laminates are defined using a three-letter classification system as shown in Table 1.
5.1 Compliance
Alternative core layer laminates classified in Table 1 shall comply with all appropriate requirements specified in 5.2, 5.3 and 5.4. This applies to both full-size sheets and cut-to-size panels.
5.2 Inspection requirements
5.2.1 General
Inspection shall be carried out in accordance with EN 438-2:2016, Clause 4. at a distance between 750 mm and 1 500 mm.
5.2.2 Colour and pattern
When inspected in daylight or D65 standard illuminant, as specified in EN ISO 11664-2, and also under tungsten-filament lightning illuminant A as specified in EN ISO 11664-2, a slight difference between the corresponding colour reference sample held by the supplier and the specimen under test is acceptable.
When colour and surface finish are critical, It is recommended that sheets are checked for colour and surface-finish compatibility without protective film before fabrication or installation.
5.2.3 Surface finish
When inspected at different viewing angles, there shall be no significant difference between the corresponding surface-finish reference sample held by the supplier and the specimen under test.
When colour and surface finish are critical, it is recommended that sheets are checked for colour and surface-finish compatibility without protective film before fabrication or installation.
5.2.4 Reverse side
The reverse side of single-sided sheets shall be suitable for adhesive bonding (e.g. sanded). In the case of sanded backs, slight chatter marks shall be permitted.
5.2.5 Visual inspection
5.2.5.1 General
The following inspection requirements are intended as a general guide, indicating the minimum acceptable quality for laminates.
Cut-to-size panels and certain applications involving full-size sheets may call for special quality requirements which can be negotiated between supplier and purchaser; in such cases the following requirements may be used as a basis for agreement.EN 438-9-2017 pdf download.