The qualitative classification complies with the requirements of UNI EN 635-2. Poplar plywood panels are usually produced by classifying them by surface appearance as belonging to Classes II/III (corresponding to UNI 6469-69 Classes B/BB). Other classifications can be supplied upon request.
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Class I (formerly Class AB under UNI 6471) The surface can remain visible, ideal for any type of finish (plating, transparent varnishing, satin finish, etc.) Only a few pin knots or sound and adherent ones without cracking are allowed. Very light colourings, stuccoes or repairs, well done and with a colour consistent with the rest of the surface, are allowed too. |
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Class II (formerly Class B under UNI 6471) “Natural” surface, with chromatic changes and sound knots, suitable for coatings with rolled section, pigmented varnishes or lacquer. Adherent sound knots are allowed up to a 35 mm diameter, as well as small deciduous knots or cracking. Moreover, low contrast colourings, occasional adhesive stains, well done repairs and stuccoes are allowed too. |
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Class III (formerly Class BB under UNI 6471) “Open” surface, stuccoed upon request, suitable for non visible uses. Adherent sound knots are allowed up to a 50 mm diameter; as well as deciduous knots, cracking, bark inclusions and overlapped parts. Colourings are allowed, provided that they are sound, as well as adhesive stains, repairs and stuccoes of any extent. |
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Class IV (formerly Class C under UNI 6471) Plywood surface for packaging or similar use. All natural wood characteristics and the different processing defects are allowed, provided that their extent does not affect the plywood functionality (for example, fungal attacks and inclusions of ferrous bodies are not allowed). |
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