Quality classification of Panguaneta plywood based on reference classes
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Quality
The poplar plywood classification based on surfaces refers to standards UNI EN 635-1 and UNI EN 635-2
The main classes are E, I, II, III and IV. Each surface of the panel is classified on its own. Thus, it is possible to have different combinations (for example, I/II, II/III, III/IV).
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Class E (formerly Class A under UNI 6471)
Surface practically without defects |
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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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