The qualitative classification complies with the requirements of UNI EN 635-2. Okoumé plywood panels with poplar internal layers 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 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. |
The bonding quality
Okoumé plywood can be manufactured with the following types of adhesive:
- Class 1: for use in dry environments (dry indoors) pursuant to UNI EN 314, urea adhesive.
- Class 2: for use in humid environments (sheltered outdoors) pursuant to UNI EN 314, melamine-urea adhesive
- Class 3: for outdoor use (unsheltered outdoors) pursuant to UNI EN 314, melamine-urea adhesive
Bonding upon request: CTB-X (Certificate nr. 51): Okoumé Twin plywood for structural and marine use |